HUMBER WASTEWATER TREATMENT PLANT 2010 Annual Report

March 31, 2011

CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

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2010 ANNUAL REPORT

EXECUTIVE SUMMARY

The Humber Treatment Plant (HTP) is one of four wastewater treatment facilities operated by the City of Toronto. This facility, located at 130 The Queensway, on the border of the old City of Toronto and City of Etobicoke, has a rated capacity of 473,000 m3 per day and serves an equivalent population of approximately 685,000. The Humber Treatment Plant discharges into Lake Ontario and, in 2010, operated under Certificate of Approval No. 4927-733KWH, last amended March 26, 2009. As of January 14, 2011, the facility operates under the amended of Approval No. 84778C6JZN. The total influent flow to the plant was 132,289 ML (362 ML/day) 1 , which was an increase of 17% from 2009. Influent concentrations of Carbonaceous Biological Oxygen Demand (CBOD 5 ), Total Phosphorus (TP) and Suspended Solids (SS) averaged 250 mg/L, 4.8 mg/L and 290 mg/L, respectively. The Humber Treatment Plant met or exceeded all effluent quality standards in 2010 as regulated under the plant’s Certificate of Approval. The Humber Plant achieved the following effluent quality in 2010: Suspended Solids (SS) Carbonaceous Biological Oxygen Demand (CBOD 5 ) Total Phosphorus (TP) Escheria Coli (E. Coli) pH SS Loading Rate CBOD 5 Loading Rate TP Loading Rate

Certificate of Approval 25 mg/L 25 mg/L 1 mg/L 200 CFU/100mL 6.0-9.5 473 kg/day

2010 Treated Effluent 11.8 mg/L 6.1 mg/L 0.5 mg/L 46 CFU/100mL 7.5 4,194 kg/day 2,209 kg/day 179 kg/day

There were 31 bypass occurrences in 2010 where portions of the flow received primary treatment before being disinfected and discharged into Lake Ontario. Total bypassed flows were estimated to be 485 ML. An average of 4,794 m3/day of waste activated sludge was removed from Final Clarification Tanks in 2010. Of this, 581 m3/day was transferred directly to the Ashridges Bay Treatment Plant for further treatment and disposal and 4,769 m3/day was thickened and stabilized prior to transfer. An average of 39.1 dry tonnes per day of biosolids was transferred to Ashbridges Bay for further treatment. Capital projects that continued in 2010 included South Primary Clarification Tank Rehabilitations & Retrofits, Sludge Thickening Building Expansion & Upgrade, Digester 1-6 Rehabilitation, Dechlorination Facility, Headhouse/North Grit Building NFPA/Lighting Retrofit and Final Tanks No.16/20 Overhaul. Quantities of ferrous chloride, chlorine and thickening polymer consumed in 2010 were 890,121 kg, 433,866 kg and 3,851 kg, respectively. Hydro, natural gas and potable water consumption in 2010 was 51.0M kWh, 1,762,423 m3 and 496,994 m3, respectively. 1

Flow metering accuracy and related monitoring data is currently under review.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

The total cost of operation of the Humber Treatment Plant in 2010 was $13,427,209, which was a 0.1 % increase from 2009. In 2010, the Humber Treatment Plant had 61 employees. There were 105 Total Lost Days due to work related injuries.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

Table of Contents 1 

EXECUTIVE SUMMARY..........................................................................................................................i 

1. 

INTRODUCTION.......................................................................................................................................1 

2 

OPERATIONS ............................................................................................................................................2  2.1 

Influent ..................................................................................................................................................2 

2.2 

Preliminary Treatment..........................................................................................................................2 

2.3 

Primary Treatment................................................................................................................................2 

2.4 

Secondary Treatment ............................................................................................................................3 

2.5 

Final Effluent Quality & Disinfection...................................................................................................4 

2.6 

Bypass Events........................................................................................................................................4 

2.7 

Solids Handling.....................................................................................................................................5 

2.8 

Biosolids Management..........................................................................................................................7 

2.9 

Complaints ............................................................................................................................................7 

3 

CAPITAL PROJECTS...............................................................................................................................8 

4 

MAINTENANCE........................................................................................................................................9 

5 

4.1 

Maintenance Summary..........................................................................................................................9 

4.2 

Flow Meter Calibration Record............................................................................................................9 

4.3 

Solids Handling (Work Area 1).............................................................................................................9 

4.4 

Liquids Handling – Primaries (Work Area 2).......................................................................................9 

4.5 

Support Services (Work Area 3)..........................................................................................................10 

4.6 

Liquids Handling – Secondaries (Work Area 4) .................................................................................11 

CHEMICALS AND UTILITIES .............................................................................................................12  5.1  Chemicals............................................................................................................................................12  5.1.1  Polymer for WAS Thickening....................................................................................................12  5.1.2  Ferrous Chloride for Phosphorus Removal ................................................................................12  5.1.3  Chlorine for Disinfection ...........................................................................................................12  5.1.4  Sodium Bisulphite for Dechlorination........................................................................................12  5.2  Utilities................................................................................................................................................13  5.2.1  Water..........................................................................................................................................13  5.2.2  Hydro .........................................................................................................................................13  5.2.3  Natural Gas.................................................................................................................................13 

6 

OPERATIONAL COSTS.........................................................................................................................14 

7 

HUMAN RESOURCES............................................................................................................................15  7.1 

Staffing ................................................................................................................................................15 

7.2 

Occupational Health & Safety ............................................................................................................15 

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

7.3 

Staff Training & Development ............................................................................................................15 

7.4 

Utility Operator Certification .............................................................................................................17 

7.5 

MOE/MOL Correspondence ...............................................................................................................17 

Appendices APPENDIX A - Glossary of Abbreviations APPENDIX B – Plant Schematic APPENDIX C – Performance Charts:  Influent Flows  Influent SS & CBOD 5 Concentrations  Influent TKN & TP Concentrations  Effluent SS & CBOD 5 Concentrations  Effluent TKN, Ammonia & Total Phosphorus Concentrations  Digester Gas Production APPENDIX D – Influent and Effluent Metal Concentrations APPENDIX E – Biosolids Metals Analyses APPENDIX F – Analytical Testing Summary APPENDIX G – Influent Flow Meter Calibration Records

List of Tables Table 1: Influent Parameters .................................................................................................................. 2  Table 2: Primary Treatment Effluent Parameters................................................................................... 3  Table 3: Secondary Treatment Process Parameters................................................................................ 4  Table 4: Treated Wastewater Parameters .............................................................................................. 4  Table 5: Monthly Average Final Effluent Parameters............................................................................ 4  Table 6: Bypass Events Summary .......................................................................................................... 5  Table 7: Solids Handling Process Parameters ........................................................................................ 6  Table 8: Utility Consumption, 2009 & 2010........................................................................................ 13  Table 9: Operating Costs, 2009 & 2010............................................................................................... 14  Table 10: Plant Staffing........................................................................................................................ 15  Table 11: Wastewater Treatment Certificates ...................................................................................... 17 

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

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2010 ANNUAL REPORT

INTRODUCTION

The Humber Treatment Plant is one of four wastewater treatment facilities operated by the City of Toronto under the responsibility of the Wastewater Treatment section of Toronto Water. The facility is located at 130 The Queensway, on the border of the old City of Toronto and City of Etobicoke. The Humber Plant services the area bounded by Steeles Avenue in the North, Mimico Creek in the West, Bathurst Street in the East and the lakeshore in the South. This area contains an estimated connected population of 685,000. The Humber Treatment Plant has a rated capacity of 473,000 m3 per day. Major treatment processes and equipment include screening and grit removal, primary treatment, secondary treatment, phosphorus removal, effluent disinfection and dechlorination, final effluent pumping (when required), waste activated sludge thickening, anaerobic sludge digestion and odour control. Numerous auxiliary systems are required for the proper operation of many plant processes and include potable water, process water, HVAC, electrical power distribution, gas, chemicals and instrument air. The Ministry of the Environment (MOE) has classified the Humber Treatment Plant as a Class IV wastewater treatment facility under Regulation 129/04. In 2010, the facility operated under the Certificate of Approval No. 4927-733KWH last amended March 26, 2009. As of January 14, 2011, the facility operates under the amended Certificate of Approval No. 8477-8C6JZN. This report is a summary of the operation of the plant and its performance in 2010. Highlights of the report include a discussion of effluent quality and summaries of plant operations and maintenance activities, chemical and utility consumption, operational costs and human resources.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

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2010 ANNUAL REPORT

OPERATIONS

2.1 Influent Wastewater flows to the plant via a common sewer which combines the flow from the Queensway Sanitary Trunk Sewer and Humber Sanitary Trunk Sewer. A portion of the Humber Treatment Plant sewershed consists of combined sanitary and storm sewers, causing plant influent to be sensitive to wet weather events. A summary of annual flow and influent parameter concentrations for the past two years is shown in Table 1. Total plant influent increased by 17% from 2009 and a comparison of monthly influent flow rates and characteristics for 2009 and 2010 is illustrated in Appendix C 2 . Table 1: Influent Parameters Parameter Influent Flow [ML/day] Total Annual Flow [ML] Influent SS [mg/L] Influent CBOD 5 [mg/L] Influent TP [mg/L]

2010

2009

362 132,289 290 250 4.8

300 113,060 354 212 4.6

Influent concentrations of select heavy metals have been included in Appendix D. 2.2 Preliminary Treatment Raw wastewater enters the Humber Treatment Plant Head House which provides grit and screenings removal operations. There are six inlet channels, four (4) equipped with front raking mechanical bar screens and two (2) equipped with back raking bar screens. The screens have bars spaced 1.25 cm apart to remove rags and debris from the wastewater. The wastewater is then split into two streams; one of the streams flows south for grit removal within the Head House and the other flows north to a separate grit removal building. Ferrous chloride is added in the Head House for phosphorus removal. In the south plant, grit is removed by six vortex chambers (6.1 m in diameter and 0.9 m in depth), each having a hydraulic capacity of 170,500 m3/day. In the north plant, grit is removed by three Aerated Grit Channels (19 m x 9.1 m x 4.3 m), each having a hydraulic capacity of 209,000 m3/day. Grit and screenings are hauled to a sanitary landfill site. The quantity of grit and screenings removed by the aerated grit channels, vortex tanks and mechanical bar screens averaged approximately 14.5 tonnes per day in 2010. 2.3 Primary Treatment The next step in the treatment process is called Primary Settling or Clarification where the flow velocity is reduced through the Primary Clarification Tanks allowing the heavier solids in the wastewater to settle to the bottom and partially removing non-soluble phosphorus. Sludge collectors in the tanks sweep the settled sludge (primary sludge or raw sludge) into sludge hoppers located on the bottom of the tank at one end, from where the sludge is pumped to anaerobic digestion tanks. 2

Influent flow metering accuracy and related monitoring data is currently under review. If required, previously reported data will be revised and resubmitted.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

There are a total of 11 Primary Clarification Tanks: eight rectangular tanks with dimensions of 72 m x 11 m x 3.3 m, each having a hydraulic capacity of 90,000 m3/day (South Plant), and three rectangular tanks with dimensions of 76 m x 25 m x 3.6 m, each having a hydraulic capacity of 227,000 m3/day (North Plant). The overflow from these tanks (primary effluent or settled sewage), still containing the bulk of the organic solids, flows into the Aeration Tanks. Although the plant has the capacity to co-settle Waste Activated Sludge (WAS) from the Final Clarification Tanks in the Primary Clarification Tanks, this did not occur in 2010. Table 2 contains a summary of key primary treatment effluent parameter concentrations and their respective removal efficiencies in 2009 and 2010. Table 2: Primary Treatment Effluent Parameters Parameter

2010

SS [mg/L] CBOD 5 [mg/L]

100 139

Primary Removal Efficiency 65% 44%

2009 97 106

Primary Removal Efficiency 72.5% 50%

2.4 Secondary Treatment In Secondary Treatment, return activated sludge from the Final Clarification tanks is mixed with primary effluent and treated through a conventional, suspended biomass activated sludge process which occurs in Aeration Tanks. The activated sludge is made up of micro-organisms which are a natural part of wastewater. In the presence of oxygen, these micro-organisms break down organic solids in the wastewater. Air is supplied to the Aeration Tanks through nine electrically driven blowers. There are a total of eight Aeration Tanks each equipped with ceramic fine bubble dome diffusers: five in the South Plant treatment process and three in the North Plant treatment process. The South Plant consists of three-pass tanks (capable of step-feed), each pass measuring 139.3 m x 8.2 m x 4.6 m. The North Plant consists of single-pass, complete-mix type tanks each measuring 73.3 m x 17.8 m x 7.5 m. Total secondary treatment process volume is 108,700 m3. In 2010, one north aeration tank was taken out of service for repair. Mixed liquor from the Aeration Tanks flows to large quiescent Final Clarification Tanks where the Activated Sludge is allowed to settle. A controlled quantity of this sludge is returned to the Aeration Tanks in order to maintain a sufficient microorganism concentration. The excess is removed as Waste Activated Sludge (WAS) and is either pumped directly to the Ashbridges Bay Treatment Plant (ABTP) via the Mid-Toronto Interceptor (MTI) for further treatment or thickened and anaerobically digested prior to transfer to the ABTP. There are 21 Final Clarification Tanks: 9 circular tanks (45.7 m in diameter and 4.6 m in depth) and 12 square tanks (29 m x 29 m x 4.0 m), for a total volume of approximately 106,800 m3 and a total surface area of 24,900 m2. A summary of key aeration basin parameters for the previous two years is shown in Table 3.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

Table 3: Secondary Treatment Process Parameters Parameter Aeration Loading [kg CBOD 5 /m3·d] Mixed Liquor Suspended Solids [mg/L]

2010 0.45

2009 0.32

2,384

2,238

2.5 Final Effluent Quality & Disinfection In 2010, the Humber Treatment Plant continued to produce a high quality effluent which surpassed the requirements of the plant’s Certificate of Approval. A summary of the key final effluent parameters for the previous two years is shown in Table 4. Details of the plant’s final effluent characteristics are presented in graphical form in Appendix C. Table 4: Treated Wastewater Parameters Parameter SS [mg/L] CBOD 5 [mg/L] TP [mg/L] pH E-Coli [CFU/100mL] SS Loading Rate (kg/day) CBOD 5 Loading Rate (kg/day) TP Loading Rate (kg/day)

Certificate of Approval 25 25 1 6.0 – 9.5 200 473

2010

Removal Efficiency

2009

Removal Efficiency

11.8 6.1 0.5 7.5 46

96% 97% 90% -

14 7 0.7 7.3 24

95% 96% 85% -

4194 2209 179

4200 2100 210

Table 5: Monthly Average Final Effluent Parameters Parameter

C of A

Jan

Feb

March

April

May

June

July

Aug

Sept

Oct

Nov

Dec

TP [mg/L]

1

0.54

0.45

0.4

0.6

0.5

0.5

0.5

0.45

0.5

0.5

0.51

1

200

2

4

135

25

36

25

107

40

57

51

30

43

E-Coli* [CFU/100mL]

*These figures represent adjusted monthly geometric mean values to include substitution of "1" where "0" was previously reported.

Final effluent concentrations of nine (9) select heavy metals have been included in Appendix D. 2.6 Bypass Events There were thirty-one occurrences in 2010 of secondary treatment bypasses resulting in primary effluent discharge into Lake Ontario. All secondary bypass flows were chlorinated for disinfection and each incident was reported to the MOE Spills Action Center and recorded in the plant’s Monthly Report. Secondary bypass events occurred due to high wet weather flows that exceeded the plant’s secondary treatment capacity. Total precipitation in the Toronto area was 784.4 mm in 2010, a 15% decrease from 2009. Average plant influent was 17% higher compared to the previous year. A summary of bypass events occurring in 2010 is presented in Table 6. Secondary bypass events resulted in an estimated total annual bypass volume of 485 ML.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

Table 6: Bypass Events Summary No.

Date

Time

Duration

Volume (m3)

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31.

March 12/13 March 13/14 April 8 April 8 May 7/8 June 2/3 June 6 June 16 June 22 June 24 June 26 June 27/28 June 28 July 9 July 23 July 24 July 28 August 21/22 August 22 August 23 September 2 September 3 September 16 September 28 September 28 October 14 November 16/17 November 30 December 1 December 1 December 12

20:30 – 0:20 17:30 – 6:00 1:30 – 1:45 8:18 – 10:30 22:00 – 2:10 18:50 – 1:25 5:15 – 7:00 10:40 – 13:00 14:10 – 16:15 6:20 – 10:25 12:30 – 14:45 19:40 – 4:30 9:00 – 11:10 9:30 – 13:50 4:45 – 10:15 17:55 – 18:20 19:50 – 21:20 22:50 – 0:10 12:30 – 14:15 8:20 – 8:45 19:20 – 20:15 13:25 – 15:10 11:15 – 15:50 12:19 – 14:30 18:20 – 20:25 6:45 – 10:30 19:50 – 2:30 9:15 – 9:45 0:50 – 1:45 4:45 – 10:50 11:30 – 12:55

3 hrs 50 min 12 hrs 30 min 15 min 2 hrs 12 min 4 hrs 10 min 6 hrs 35 min 1 hr 45 min 2 hrs 20 min 2 hrs 5 min 4 hrs 5 min 2 hrs 15 min 8 hrs 50 min 2 hrs 10 min 4 hrs 20 min 5 hrs 30 min 25 min 1 hr 30 min 1 hr 20 min 1 hr 45 min 25 min 55 min 1 hr 45 min 4 hrs 35 min 2 hrs 11 min 2 hrs 5 min 3 hrs 45 min 6 hrs 40 min 30 min 55 min 6 hrs 5 min 1 hr 25 min

22,663 143,243 0.34* 818 55,589 15,306 1,460 3,519 5,200 3,738 1.883 105,345 1,012 20,448 36,772 74 4,367 674 156 241 0** 6,093 23,116 7,227 59 692 15,751 69 183 9,151 1,700

*Bypass flow was trickling over the weir. Volume was manually calculated. **Bypass quantity was below instrumentation detection level.

2.7 Solids Handling WAS is thickened either through dissolved air flotation (DAF) or centrifugation from approximately 0.5% to between 4% and 5% total solids content. In 2010, 2 remaining DAF units each with a surface area of 74.3 m2 and capacity to treat 19 L/s of WAS were in service but decommissioned by the end of January. In place of these DAF units, two thickening centrifuges, each with a capacity of 30 L/s, were then placed into service. The thickened waste activated sludge (TWAS) from these units was approximately 5% solids content without the use of polymer. WAS was also pumped directly to the Ashbridges Bay Treatment Plant via the MTI due to limited capacity of the existing WAS thickening facilities which were undergoing expansion in 2010. Additional thickening centrifuges will be installed in 2011 as part of the WAS thickening facilities expansion project. A two-stage, anaerobic, mesophilic sludge digestion process is utilized at the Humber Treatment Plant. This process reduces the sludge volume, mitigates odours and destroys pathogens, thereby stabilizing the sludge. Primary sludge, scum and thickened waste activated sludge (TWAS) are fed

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

into eight (8) primary digesters. Sludge from the primary digesters is transferred into two (2) secondary digesters. The resulting anaerobically digested sludge (biosolids) is subsequently transferred to the Ashbridges Bay Treatment Plant via the MTI for further treatment. All primary and secondary digesters measure 33.5 m in diameter and 9.75 m in depth for a volume of 6,050 m3 each. Primary digesters have concrete roofs and are equipped with mixers, while secondary digesters have no mixers and are equipped with steel floating covers which accommodate changes in volume of stored gas and sludge. In 2010, an average of 2,661 m3/day of primary sludge was pumped to the Anaerobic Digesters. Average TS concentration of the primary sludge was 1.69 % and the TVS content was 78.74 % of TS. An average of 4,769 m3/day of WAS was thickened by centrifugation, 250 m3/day thickened by DAF and 581 m3/day transferred directly to the Ashbridges Bay Treatment Plant via the MTI. WAS contained an average SS concentration of 6,877 mg/L. An average of 937 m3/day of TWAS was pumped to the Anaerobic Digesters from the centrifuge units and 30 m3/day was pumped to the digesters from the DAF tanks. Average TS concentrations of TWAS was 4.1% and its TVS solids content was 82.2% of TS. In 2010, one primary digester was taken out of service for construction. The average hydraulic retention time of sludge in the primary digesters during this period was 9.7 days. Organic loading of the primary digesters averaged 1.4 kg TVS per m3 of digester capacity per day. Approximately 39.1 tonnes per day of biosolids were transferred to the Ashbridges Bay Treatment Plant via the MTI in 2010. A summary of the digestion process for the previous two years can be seen in Table 7. Table 7: Solids Handling Process Parameters Parameter Total WAS Thickened [m3/day] WAS transferred to ABTP [m3/day] WAS SS [mg/L] Primary Sludge Digested [m3/day] Primary Sludge TS [%] Primary Sludge TVS [%] Total TWAS Digested [m3/day] Biosolids transferred to ABTP [dry tonnes per day] Biosolids TS [%]

2010 4,794 581 6,877 2,661 1.69 78.7 967 39.1 1.5

2009 3,030 2,090 7,078 3,100 2.19 71.3 850 40.6 1.75

Biosolids are regulated by Ontario Regulation 267/03, The Nutrient Management Act, which governs the maximum metal concentration in biosolids that are applied to land. Although biosolids generated at the Humber Treatment Plant are transferred to the Ashbridges Bay Treatment Plant for further treatment and are not directly applied to land, the biosolids met all metal concentration criteria as designated in O.Reg 267/03. Results may be found in Appendix E. The average digester gas volume generated in 2010 was 15,600 m3/day. This was an increase of 0.5% from the 2009 volume. Monthly digester gas production is shown in Appendix C.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

In 2010, the daily average inflow to the Humber Treatment Plant was 362 ML/day. Medium flow projection scenarios from a facilities forecast report conducted in 2005 indicate that the average daily influent flow in 2010 would be approximately 330 ML/day and remain constant through 2014. It is anticipated that generated sludge volume for 2011 will be within 5 % of the 2010 volume. 2.8 Biosolids Management All biosolids generated at the Humber Treatment Plant are transferred to the Ashbridges Bay Treatment Plant for further treatment and subsequent biosolids management. 2.9 Complaints Humber Treatment Plant personnel logged a total of 3 complaints in 2010. Each of these 3 were related to odour. All reported complaints are recorded, investigated by City of Toronto staff and, where possible, action is taken immediately.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

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2010 ANNUAL REPORT

CAPITAL PROJECTS

Under Toronto Water’s capital program, the Humber Treatment Plant commenced or continued with the following projects:  Cogeneration Facility  Digesters 1 to 6 Rehabilitation  Sludge Thickening Building Upgrade  Final Tanks No.16/20 Overhaul  South Primary Retrofit  Plant Services PCS- Phase 1  Telephone and Paging System Upgrade  Return Activated Sludge Pump Variable Frequency Drive Installation  Headhouse/North Grit Building NFPA/Lighting Retrofit  New Electrical Substation  Chlorine System Conversion to Hypochlorite & Upgrade  Dechlorination Facility  Miscellaneous structural/civil/arch – Garage & Pump Stn.  Process Audit  Odour Control Phase I Implementation  Air Compressor Standby Power  Glycol System Construction  Digester 7 -10 Cleaning and Upgrades  Aeration Tanks Repairs  Liquid Process Upgrades  600V Switchgear Replacement  Effluent/Flushing/Hot Water Repairs  RAS Header Inspection and Cleaning  Aeration Gallery RAS Pipe Replacement  Electrical Assessment

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

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2010 ANNUAL REPORT

MAINTENANCE

4.1 Maintenance Summary The Humber Treatment Plant maintenance activities in 2010 were distributed between three process Work Areas and 1 Support Services group. Staff from these groups performed a variety of scheduled, preventative, predictive and breakdown maintenance on a diverse spectrum of equipment. The main goal of maintenance activities is to ensure equipment availability to meet plant process operation requirements. The following is a summary of significant maintenance activities conducted over the past year. These are considered to be maintenance and/or minor modifications as per Conditions 10(6)(c) & (j) and Condition 11 of the Certificate of Approval. 4.2 Flow Meter Calibration Record Plant flow is measured by a transit time velocity flow meter which meters total plant influent in a common channel upstream of the Head House. Plant flow is also measured by three venturi flow meters: two measure flow to the north plant through two parallel conduits and one measures flow to the south plant through a single conduit. Calibration records for flow meters are attached in Appendix G. 4.3 Solids Handling (Work Area 1) Work Area 1 includes WAS thickening centrifuges, DAF units, Anaerobic Digesters and gas collection, compression, and burner systems. The following maintenance was completed in 2010 for Work Area 1:        

South Middle Heetco Burners cleaning and calibration of all safety controls North Heetco Burners cleaning and calibration of all safety controls Gas Compressors C-5640 and C-5680 overhauled Testing and calibration of Digester MSA fixed gas detectors and documented via WMS quarterly Testing and calibration of Work Area 1 Back Flow Preventers and documented yearly Digester 8 Recirculation and Hot Water Pumps P-4760, P-4761, P-2264 and P-2265 overhauled Digesters 7 and 8 Gas Dome safety valve systems cleaned, inspected and sent out for certification Digesters 7 and 8 TI.T. L.I.T. and P.I.Ts all sent out for calibration and certification

4.4 Liquids Handling – Primaries (Work Area 2) Work Area 2 encompasses preliminary treatment processes including influent bar screens, aerated grit chambers, vortex grit chambers, and primary clarifiers. The following maintenance was completed in 2010 for Work Area 2:   

Bar Screen Nos. 5 and 6 regular preventative maintenance Vortex system regular inspection, blower oil change every three months Primary Pumping Station Nos. 1 and 2 regular maintenance

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

    

2010 ANNUAL REPORT

North Primary Tank No. 7 travelling bridge mechanical inspection, inspection/replacement of all travelling teeth and replacement of all suction valves Primary Tank Nos. 8 and 9 regular preventative maintenance Primary Tank Nos. 7, 8 and 9 inspection/maintenance of electrical panel Replacement of Badger flow meter initiated in 2010 Replacement of sludge density meter initiated in 2010

4.5 Support Services (Work Area 3) Work Area 3 includes support services around the plant, process air blowers, the HVAC system, filtered flushing water and disinfection processes. The following maintenance was completed in 2010 for Work Area 3:                          

Overhauled one 1500 H.P electric blower Conducted vibration analysis, coupling alignment and oil analysis on 9 electric blowers Installed/replaced various lighting fixtures and motorized dampers Replaced 18 flexible connections from the Chlorine cylinders to the gas header Overhauled two chlorinators Replaced cathodes in 3 Chlorine evaporators Tested and inspected all chlorine, methane, carbon monoxide and hydrogen sulphide sensors assigned to Work Area 3 Replaced 2 sump pumps and overhauled 2 sampling pumps at Palace Pier Inspected, tested and repaired all components of the Chlorine scrubber system Serviced and calibrated all equipment at Palace Pier Coordinated the inspection, testing and repairs of all cranes and lifting devices Coordinated the testing of all Chlorine suits and replaced SCABA bottles as required Inspected and replaced (where necessary) all fire extinguishers Inspected fire alarm system and all fire hydrants Maintained all first aid boxes and eye wash stations Inspected, tested and repaired 7 hot water boilers Inspected all HVAC equipment/glycol system Overhauled 2 hot water pumps in the engine room basement Overhaul glycol package located below the east maintenance shop Coordinated the service and repair of all UPS units Overhauled 2 exhaust fans in the engine room Overhauled 1 high lift pump and replaced 1 mud well pump Washed and cleaned 20 primary and secondary clarification tanks Conducted a review of pressure vessels certification Maintained facilities and grounds, removed snow and salt from all roadways in the Plant Overhauled one Filter Sand Bed

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

4.6 Liquids Handling – Secondaries (Work Area 4) Work Area 4 encompasses secondary treatment processes including aeration, phosphorus removal and final clarification. The following maintenance was completed in 2010 for Work Area 4:  Completed repairs to FeCl 2 system (replaced/repaired flushing water lines and related valves, overhauled sump pumps and diaphragm dosing pumps, repaired No. 2 basket strainer and related piping)  Extensive repairs to flushing water lines and feeder lines throughout Work Area 4  Inspected/tested/repaired 10 reduced pressure zone backflow preventers in Work Area 4  Serviced HVAC equipment in the east maintenance shop  Overhauled Final Settling Tanks Nos. 5,7,10,11  Replaced center drive collector mechanisms on Final Tanks Nos. 16,20  Repairs to various Final Settling Tanks (rebuilt discharge valves and pneumatic components, overhauled plug valves and actuator components, overhauled recirculated sludge discharge check valves, rebuilt recirculated sludge valves, suction valves)  Replaced/rebuilt scum pumps in Final Tank Nos. 13,14,15,16,17,19,20  Recirculated sludge pump valves, lines and pneumatic valves preventative maintenance  Lubricated all mechanical components as per manufacturer's recommendations  Modified tunnel lighting throughout Work Area 4  Major modifications to 2 scum systems (new valves, limit switches, flushing lines, gland water lines, new piping, and rebuilt scum pumps)  Major modifications to 2 sump pump systems (install new piping, rebuild pumps, run new flushing water lines, run new gland water lines, install new float level system and programming)  Completed wiring for 4 new SCADA systems in the Returns  Installed 2 new VFD drives (involved major wiring and programming work)  Modified flushing system for venturi flow meters (ran new lines with flow switches and timers, programming)  Vacuumed out numerous scum tanks

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

5

2010 ANNUAL REPORT

CHEMICALS AND UTILITIES

5.1 Chemicals Several chemicals are used for a variety of treatment processes at the plant. Major process chemicals are discussed below and include:     5.1.1

Polymer (WAS Thickening) Ferrous Chloride (Nutrient Removal) Chlorine (Disinfection) Sodium Bisulphite (Dechlorination Commissioning) Polymer for WAS Thickening

Polymer is used for WAS thickening in the DAF and centrifuge units. Total polymer consumption during 2010 was approximately 3,851 3 kg. This is a decrease of 64% from 2009. The polymer dosage rate averaged 2.2mg/L of WAS thickened. This is a decrease of 69% from 2009. Polymer was purchased at an average cost of $3.45 per kilogram, plus applicable taxes. 5.1.2

Ferrous Chloride for Phosphorus Removal

Ferrous chloride is used as a phosphorus precipitant in the treatment process. Annual coagulant consumption during 2010 was approximately 890,121 kg as Fe. This is a 112% increase from 2009. The ferrous chloride dosage rate averaged 6.7mg/L Fe during the year. This is an increase of 81% from 2009. Ferrous chloride was purchased at an average cost of $776 per tonne Fe, plus applicable taxes. 5.1.3

Chlorine for Disinfection

Chlorine was used in 2010 as final effluent disinfection and return activated sludge control. Total chlorine consumption during 2010 was 433,866 4 kg. This is an increase of 7.5% from 2009.. Chlorine was consumed at an average rate of 3.3 mg/L treated effluent. This is a decrease of 8% from 2009. Chlorine was purchased at an average cost of $4.30 per kilogram, plus applicable taxes. 5.1.4

Sodium Bisulphite for Dechlorination

Sodium Bisulphite was used in 2010 during commissioning of the final effluent dechlorination system. Sodium Bisulphite was purchased at an average cost of $2.35 per kilogram, plus applicable taxes.

3 4

Estimated based on average day polymer use Estimated based on average day chlorine use

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

5.2

2010 ANNUAL REPORT

Utilities

A summary of utility consumption for the previous two years at Humber Treatment Plant is provided in Table 8. Table 8: Utility Consumption, 2009 & 2010 Utility Water [m3 / month] Hydro [kWh/ month] Gas [m3/ month]

5.2.1

2010 41,416 4,250,098 146,869

2009 49,023 4,407,760 111,969

Water

Potable water consumption decreased 15.5% from 2009 to an annual rate of 496,994 m3. Total cost for potable water was $1,245,217. The average unit cost of water was $2.51 per m3, a 33% increase over 2009. 5.2.2

Hydro

Power consumption decreased 3.6% from 2009 to an annual total of 51,001,171 kWh. Total cost for power was $4,691,883. The average unit cost of power was $0.0920 per kWh, a 4.2% increase over 2009. 5.2.3

Natural Gas

Natural gas consumption increased 31% from 2009 to an annual rate of 1,762,423 m3. Total cost for natural gas was $550,285. The average unit cost of natural gas was $0.312 per m3, a 20.8% decrease over 2009.

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

6

2010 ANNUAL REPORT

OPERATIONAL COSTS

Plant operational costs are broken down into five (5) categories: Salaries & Benefits, Materials & Supplies, New Equipment, Services & Rents and Inter-Divisional Charges. Materials & Supplies is further segregated into Utilities (power, natural gas and water), Machine & Equipment Parts, Chemicals and Other Materials & Supplies. The total cost of plant operation in 2010 was $13,427,209. Overall, operational costs increased by 0.1% from 2009. A breakdown of annual operational costs for 2009 and 2010 is shown in Table 9. The 2010 operating costs are also illustrated in Figure 1. Table 9: Operating Costs, 2009 & 2010 Operating Cost Salaries & Benefits Materials & Supplies Utilities Machine & Equipment Parts Chemicals Other Materials & Supplies New Equipment Services & Rents Inter-Divisional Charges TOTAL PROGRAM COST:

2010 $4,634,903

2009 $4,303,350

$6,375,963 $681,318 $668,760 $279,225 $47,907 $726,673 $12,458 $13,427,209

$6,216,064 $1,093,609 $623,852 $281,351 $1,827 $606,332 $289,099 $13,412,926

Figure 1: 2010 Humber Treatment Plant Operating Cost Breakdown

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

7

2010 ANNUAL REPORT

HUMAN RESOURCES

7.1 Staffing In 2010, the Humber Treatment Plant had 61 employees. Several positions were vacant due to long term illness or recent retirement. Plant Staffing is shown in Table 10. Table 10: Plant Staffing Position Title Plant Manager Senior Engineer Engineer Engineer In Training Area Supervisors Electronic Instrumentation Specialist Support/Materials Management Assistants Solids Handling (Work Area 1) Liquids Handling – Primaries (Work Area 2) Support Services (Work Area 3) Liquids Handling – Secondaries (Work Area 4)

Number 1 1 0 1 4 1 3 13 12 15 10

7.2 Occupational Health & Safety Continuous efforts are made in maintaining a safe working environment at the Humber Treatment Plant. The Joint Health and Safety Committee (JHSC) assists management staff in resolving issues through monthly meetings and Plant Audits. Plant Health and Safety statistics for the Humber Treatment Plant in 2010 for active employees were as follows: Incident First Aid Medical Aid Lost Time Recurrence Total

0 1 9 5 0 15

In 2010, a total of 105 lost days were attributed to work related injuries. 7.3

Staff Training & Development

The Technical Training Section of Toronto Water has developed a comprehensive Operator Training Program that expands the abilities of the operational staff, resulting in better service to the public. All Humber Treatment Plant operating staff and skilled trades staff attended training, which was held at various Toronto Water facilities. Courses were eligible for Continuing Education Units (CEU’s) from the Ontario Environmental Training Consortium (OETC).

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

2010 ANNUAL REPORT

The Humber Treatment Plant offered its operation and maintenance staff the following training courses:  AED & Level "C" CPR Renewal Course  SCBA & SAR Workshop with B / C kit  TW Facility Security  TDG & WHMIS  Electrical Safety Intermediate Level  Interest Based Model - Getting to Resolution  Natural & Bio Gas Safety  Developing Effective Teams  Industrial Maintenance Technician Certification Course - Mechanical  Industrial Maintenance Technician Certification Course - Electrical  Maintenance Manager Professional Program  Industrial Maintenance Technician Code Update & Digest Code Course 2010  Developmental Plant Technician Training Program  Confined Space Entry Workshop  Lock Out / Tag Out  Security Program Half-day Program  CAN/CSA Z462-08 – Full Day Arc Flash  AUMA Control Valve Program  PEMAC MMP Financial Review  Laser Alignment Program  Tribology Course Half-day Program  Vibration Analysis- Basic  Vibration Analysis- Intermediate  Thermography  Electrical Code- Ontario 2009  Ultrasound Program- Half Day  Air Handling Units  Gescan Proficy Machine Edition  Rotary Lobe Sample Pump  Chemical Feed System  Eaton VFD  Motor Control Centre  Heat Tracing System  Chlorine Cylinder Valve Actuator SCADA  Dechlorination Process Overview  Chemical Feed System and Simulator  Dechlorination SCADA Classroom  Dechlorination Plumbing Specialities  Dechlorination Controls and Instruments  Settling Tank Drive Unit Training - Siemens  Dechlorination Davit Crane Training  Active Filter Training

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CITY OF TORONTO WASTEWATER TREATMENT PLANT ANNUAL REPORTS HUMBER WASTEWATER TREATMENT PLANT

 

2010 ANNUAL REPORT

Dechlorination - Hands on Training Operation of Drive Unit

7.4 Utility Operator Certification Toronto Water has incorporated the requirement of a Class I operating licence into the job profiles of the skilled trades in the Water and Wastewater Treatment facilities. As part of this initiative, general operational/process training was delivered in order to prepare staff for the O.E.T.C Level 1 examination. Table 11 summarizes the status of operator certification at the Humber Treatment Plant in 2010: Table 11: Wastewater Treatment Certificates Class Level Class IV

Licensed 20

Class III

1

Class II

1

Class I

3

O. I. T.

23 48

TOTAL

7.5 MOE/MOL Correspondence There were no orders issued by either the Ministry of the Environment or the Ministry of Labour to the Humber Treatment Plant in 2010. The Ministry of the Environment was advised in writing of all secondary treatment and plant bypass events that occurred in 2010. Dates and details of these events can be seen in section 2.6. The Ministry of the Environment was also contacted regarding an unauthorized discharge of Sodium Bisulphite by Comstock (a contractor working on the installation of two SBS Tanks at HTP) that occurred on December 7, 2010.

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Appendix A Glossary of Abbreviations

Glossary of Abbreviations ABTP CBOD5 CEU CFU CSO DAF E. Coli HP HRT HTP kg kWh MWh m3 mA mg/L mL ML MTI SS TP TS TVS TWAS µg/L WAS

Ashbridges Bay Treatment Plant Five-Day Carbonaceous Biological Oxygen Demand Continuing Education Units Colony Forming Units Combined Sewer Overflow (Tank) Dissolved Air Flotation Escheria Coli horsepower Hydraulic Retention Time Humber Treatment Plant kilogram Kilowatt-hour Megawatt-hour cubic metre milliamps milligrams per litre Millilitre Megalitre Mid-Toronto Interceptor Forcemain Suspended Solids Total Phosphorus Total Solids Total Volatile Solids Thickened Waste Activated Sludge micrograms per litre Waste Activated Sludge

Definitions Percent Removal (%)

=

1

–

Concentration (Final) Concentration (Initial)

Aeration Loading = (kg CBOD / m3 Aeration Capacity)

Influent CBOD5 x Secondary Treatment Volume Capacity of Aeration Tanks

Solids Capture (%)

Centrifuge Feed TS – Centrate SS Centrifuge Feed TS

=

x 100

Appendix B Plant Schematic

Ferrous Chloride

INCOMING SEWERS

GRIT REMOVAL

PRIMARY SEDIMENTATION

AERATION

FINAL CHLORINATION SEDIMENTATION to Lake Ontario

Return Activated Sludge

SCREENING

Waste Activated Sludge

SLUDGE THICKENING TO MID-TORONTO INTERCEPTOR

Polymer

PRIMARY ANAEROBIC DIGESTERS

SECONDARY ANAEROBIC DIGESTERS

Process Flow Diagram for Humber Wastewater Treatment Plant

Appendix C Performance Charts • • • • • •

Influent Flows Influent SS & CBOD5 Concentrations Influent TKN & TP Concentrations Effluent SS & CBOD5 Concentrations Effluent TKN, Ammonia & Total Phosphorus Concentrations Digester Gas Production

HUMBER TREATMENT PLANT

Influent Flow M/L/ day

2010 SEWAGE INFLOW 500 450 400 350 300 250 200 150 100 50 0 Jan

Feb Mar

Apr

May Jun

Jul

Aug Sep

Oct

Nov Dec

2009 Average = 300.7 ML/day

2010 Average = 360.7 ML/day

HUMBER TREATMENT PLANT 2010 INFLUENT SS and CBOD 500 450 400 350 mg/L

300 250 200 150 100 50 0 Jan

Feb Mar

Apr

May Jun

SS Average = 290.5 mg/L

Jul

Aug Sep

Oct

Nov Dec

CBOD Average = 249.7 mg/L

HUMBER TREATMENT PLANT

mg/L

2010 INFLUENT TKN and Total Phosphorous 50 45 40 35 30 25 20 15 10 5 0 Jan

Feb Mar

Apr

May Jun

TP Average = 4.8 mg/L

Jul

Aug Sep

Oct

Nov Dec

TKN Average = 36.1 mg/L

HUMBER TREATMENT PLANT 2010 EFFLUENT SS and CBOD 18 16 14

mg/L

12 10 8 6 4 2 0 Jan

Feb Mar

Apr

May Jun

SS Average = 11.8 mg/L

Jul

Aug Sep

Oct

CBOD Average = 6.1 mg/L

Nov Dec

HUMBER TREATMENT PLANT 2010 EFFLUENT TKN, Ammonia and Total Phosphorous 10 9 8 7

mg/L

6 5 4 3 2 1 0 Jan

Feb Mar

TKN Avg. = 5.7 mg/L

Apr

May Jun

Jul

Ammonia Avg. = 3.1 mg/L

Aug Sep

Oct

Nov Dec

TP Avg. = 0.5 mg/L

HUMBER TREATMENT PLANT 2010 DIGESTER GAS PRODUCTION 25.0

X 103 m3

20.0 15.0 10.0 5.0 0.0 Jan Feb Mar Apr May Jun

Jul

Aug Sep Oct Nov Dec

Daily Average = 15.6 x 103 m3

Appendix D Influent & Effluent Metal Concentrations

Humber T.P. - Summary of Plant Influent & Plant Effluent Metals Analyses

Arsenic (µg/L)

Cadmium (µg/L)

Chromium (µg/L)

Copper (µg/L)

Iron (mg/L)

Lead (µg/L)

Mercury (µg/L)

Nickel (µg/L)

Zinc (µg/L)

Influent

Effluent

Influent

Effluent

Influent

Effluent

Influent

Effluent

Influent

Effluent

Influent

Effluent

Influent

Effluent

Influent

Effluent

Influent

Effluent

January

1.3

0.5