Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
NSF 350 Standard for Wastewater Treatment Systems Onsite residential and commercial water reuse treatment systems 1
General
1.1
Purpose
The purpose of this Standard is to establish minimum materials, design and construction, and performance requirements for onsite residential and commercial water reuse treatment systems. This standard also specifies the minimum literature that manufacturers shall supply to authorized representatives and owners as well as the minimum service-related obligations that a manufacturer shall extend to owners. 1.2
Scope
This Standard contains minimum requirements for onsite residential and commercial water reuse treatment systems. Systems may include: −
Graywater reuse treatment systems having a rated treatment capacity up to 5678 L/day (1500 gal/day). This applies to onsite residential and commercial reuse treatment systems that treat graywater only.
−
Residential wastewater reuse treatment systems having a rated treatment capacity up to 5678 L/day (1500 gal/day). Applies to onsite residential reuse treatment systems that treat combined wastewater generated by the occupants of an individual residence. A reuse system treating 1514 L/day (400 gal/day) to 5678 L/day (1500 gal/day) shall either be demonstrated to have met the Class I requirements of NSF/ANSI Standard 40, or must meet these requirements during concurrent testing to this Standard. A reuse treatment system treating less than 1514 L/day (400 gal/day) is not required to have met the Class I requirements of NSF/ANSI Standard 40.
−
Reuse treatment systems, both graywater and residential-type wastewater, with capacities exceeding 5678 L/day (1500 gal/day). These systems shall be performance tested and evaluated at the location of the reuse system installation, using the graywater or residential-type wastewater generated onsite from the facility serving the treatment system. The key elements of a field evaluation of a commercial onsite reuse treatment system are described in Annex A.
Management methods and end uses appropriate for the treated effluent discharged from onsite residential and commercial reuse treatment systems meeting Class R or C requirements of this Standard include indoor restricted urban water use, such as toilet and urinal flushing, and outdoor unrestricted urban water use, such as surface irrigation. Effluent quality criteria consistent with these uses are described in Section 8.6, Criteria. System components covered under other NSF or NSF/ANSI standards or criteria shall also comply with the requirements therein. This Standard shall in no way restrict new system designs, provided such designs meet the minimum specifications described herein.
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
1.3
Alternate materials, design, and construction
While specific materials, designs, and constructions may be stipulated in this Standard, systems that incorporate alternate materials, designs, or constructions may be acceptable when it is verified that such systems meet the applicable requirements of this Standard. 1.4
Performance classification
For the purpose of this Standard, systems are classified according to the chemical, biological, and physical characteristics of their effluents as determined by the performance testing and evaluations described herein. All graywater reuse treatment systems within a manufacturer's model series having rated treatment capacities less than 5678 L/day (1500 gal/day) may be classified according to the performance testing and evaluation of the system expected to produce the poorest effluent quality within the series based upon design characteristics. All residential wastewater reuse treatment systems within a manufacturer’s model series may be classified according to the performance testing and evaluation of the system with the smallest hydraulic capacity within the series. A series is limited to treatment capacities below 1514 L/day (400 gal/day), and treatment capacities between 1514 L/day (400 gal/day) and 5678 L/day (1500 gal/day). All graywater and residential wastewater reuse treatment systems having rated treatment capacities less than 378 L/day (100 gal/day) shall be within a manufacturer’s model series having rated treated capacities at or above 378 L/day (100 gal/day). The manufacturer shall submit design drawings and specifications of the entire model series, which shall include critical design parameters for the systems. An engineering review of the design parameters may be completed in lieu of performance testing and evaluation of other systems within the series provided they are determined to be appropriately proportionate to the evaluated system based on sound engineering principles. Reuse treatment systems with capacities exceeding 5678 L/day (1500 gal/day) may be similarly classified; however, consideration must be given to the conditions of the field evaluation of the system, including the graywater or residential-type wastewater characteristics, treatment system loading conditions, and other variables affecting performance. These conditions shall become limitations for other models determined to be appropriately proportionate to the evaluated system.
2
Normative references
The following documents contain provisions that, through reference in this text, constitute provisions of this Standard. At the time of publication, the indicated editions were valid. All standards are subject to revision, and parties are encouraged to investigate the possibility of applying the recent editions of the standards indicated below. 2
ANSI/AWS D1.3/D1.3M:2008, Structural Welding Code – Sheet Steel, 5th Edition, with Errata
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
American Public Health Association (APHA), American Water Works Association (AWWA) & Water Environment Federation (WEF): Standard Methods for the Examination of Water and 1 Wastewater, 21st Edition, 2005 (hereinafter referred to as Standard Methods) NFPA 70®: National Electrical Code® (NEC®), 2011
2
NSF/ANSI 40. Residential Wastewater Treatment Systems ISO 12103-1, Road Vehicles – Test Dust for Filter Evaluation
3
3
Definitions
3.1 authorized representative: An organization, group, individual, or other entity that is authorized by the manufacturer to distribute, sell, install, or service certified onsite residential and commercial reuse treatment systems. 3.2 commercial facilities: Businesses such as lodging, business parks and campuses, shopping facilities and places of public assembly where no manufacturing, assembly, industrial or food processing is involved. The wastewater generated from these facilities includes toilet and urinal flush water, hand wash and bathing water, laundry, and kitchen wastewater. Wastewater from commercial facilities may exhibit moderately high concentrations of biochemical oxygen demand, chemical oxygen demand, total suspended solids and salts. 3.3 components: All of the physical, mechanical, and electrical parts of the product. 3.4 data day: Any day in which the required daily grab and composite samples have been collected and evaluated, establishing influent and effluent values. 3.5 graywater: Wastewater from water bearing fixtures, including laundry, such as clothes washers and laundry sinks, and bathing, such as bathtubs, showers, or sinks, but excluding toilets, urinals, bidets, kitchen sinks, and dishwashers. 3.6 graywater treatment system: An organized and coordinated system of components that functions to treat graywater generated by residences and commercial facilities. 3.7 manufacturer: The entity that develops, designs, and produces onsite reuse treatment systems. 3.8 product: A system of components that functions to treat and / or disperse reuse water.
1 2
3
Standard Methods for the Examination of Water and Wastewater . National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269-7471 .
International Organization for Standardization (ISO), Case postale 56, CH-1211 Geneve 20, Switzerland
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
3.9 residential wastewater: Human body waste and liquid waste generated by the occupants of an individual residence. 3.10 residential wastewater treatment system: An organized and coordinated system of components that functions to treat all wastewater generated by individual residence. 3.11 restricted urban water use (indoor and outdoor): Treated water acceptable for use in toilet/urinal flushing (indoor); and subsurface irrigation and dispersal (outdoor). 3.12 unrestricted urban water use (outdoor): Treated water acceptable for use in surface irrigation and subsurface irrigation, including irrigation of edible crops without the edible portion being in direct contact with the treated water.
4
Materials
Materials shall be durable and capable of withstanding stresses and wear during shipping, assembly, installation, and operation. System materials shall not be adversely affected when subjected to the use environment. NOTE – Because there are numerous design criteria suitable for the manufacture of residential graywater treatment systems, manufacturers should acquire appropriate engineering expertise in evaluating the design of the system.
4.1 Interior surfaces The interior surfaces of the system shall be free of spalls, honeycombs, and pits with the exception that rough surfaces, intended to support microbiological growth, shall be permitted. Interior surfaces shall show no visible signs of structural change following performance testing and evaluation including, but not limited to, flaking, pitting, or the formation of structurally significant cracks. 4.2 Exterior surfaces Exterior surfaces shall show no visible signs of structural change following performance testing and evaluation including, but not limited to, flaking, pitting, or the formation of structurally significant cracks. NOTE – Small surface cracks exhibited by concrete tanks are normally expected in some circumstances and shall not be considered structural deterioration.
4.3 Welding Welded seams and deposited weld material shall meet the requirements of sections 4.1 and 4.2. Welds and welding methods shall conform to ANSI/AWS D1.1 for steel 1/8 in (3.2 mm) and thicker or ANSI/AWS D1.3 for steel that is less that 1/8 in (3.2 mm). The welds shall be visually inspected and shall be acceptable if the criteria of Table 6.1 of ANSI/AWS D1.1 are satisfied.
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
The location, type and size of welds shall be shown on the drawings required in Section 9. Welds that do not conform to the manufacturer’s drawings, based on visual examination of the weld, shall be repaired prior to testing and the repairs noted in the final report. The system shall be free from cracks at the interface between the base metal and the weld, or within the weld metal. 4.4 Dissimilar metals Dissimilar metal materials, not considered compatible at the electromotive level, shall not be in direct contact. An electrically nonconductive insulating fitting shall be provided at the junction between such dissimilar metal parts or components.
5 Design and construction 5.1 Exposed surfaces All exposed surfaces shall be free from nonfunctional rough or sharp edges that may cause injury to persons using, installing, maintaining, or servicing the system. 5.2 Structural integrity The system, when filled or empty, shall maintain its structural integrity. An in situ visual evaluation shall be performed during and after the performance testing and evaluation. 5.3
Water tightness
5.3.1 Residential wastewater reuse treatment systems: The system, including all joints, seams, and components, shall preclude infiltration of ground water into the system and exfiltration of wastewater out of the system. Inlet and outlet ports shall have a short section of sewer pipe installed per the manufacturer’s installation recommendations. The test pipe sections shall be capped and shall be leak free at the caps. The system shall be filled to the ceiling of the tank with tap water and held for 24 h. At the end of this 24-h period, there shall be no more than a 0.5% change from the initial water volume of the system. NOTE – At the manufacturer’s discretion, the system may be filled to the high water alarm level with tap water and held for up to 24 h prior to the start of the infiltration and exfiltration resistance test.
5.3.2 Graywater reuse treatment systems: The system, including all joints, seams, and components, shall be watertight. A visual evaluation shall be performed during and after the performance testing and evaluation for signs of any leakage. 5.4 Noise When installed according to the manufacturer’s instructions, the system shall not produce excessive noise. Noise associated with system operation, measured at 1.2 m (4 ft) above the ground surface, 6 m (20 ft) in four directions, at 90, 180, 270, and 360° from the system and its appurtenances shall not exceed 60 dbA. These requirements apply to both systems installed inside and exterior to the building.
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
5.5 Mechanical components Mechanical components shall not require periodic maintenance or adjustment by the owner. NOTE – Replacement of fuses and similar devices or visual inspection of warning devices do not qualify as periodic maintenance or adjustment.
5.6 Electrical components Electrical components shall be protected by safety devices, such as circuit breakers and fuses. ANSI/NFPA 70 shall be followed for all electrical components, electrical connections, system installation, and system operation. 5.7 Access ports 5.7.1 The system shall be demonstrated to have access ports that are sized and located to facilitate the installation, removal, sampling, examination, maintenance, and servicing of components and compartments that require routine maintenance and inspection. Systems installed below grade shall include ground level access ports. The access ports shall be of sufficient size and located so as to allow for the following: 1) visual inspection and removal of all mechanical or electrical components; 2) periodic cleaning or replacement of components and removal of residuals as required by the manufacturer in the operation and maintenance manual; NOTE – Periodic refers to all procedures specified in the manufacturer’s operation and maintenance manual that must be performed within intervals of two years.
3) visual inspection and sampling as required by the manufacturer in the operation and maintenance manual, including a means for collecting a representative effluent sample and determining the need for residuals removal; and 4) removal (manually or by pumping) of collected residuals as required by the manufacturer in the operation and maintenance manual. 5.7.2 Access ports shall be protected against unauthorized intrusions by methods compatible with the size of the access port. Acceptable protective measures for access ports that allow personal entry include, but are not limited to: – – –
a padlock; a cover that can be removed only with specialized tools; or a cover having a minimum net weight of 29.5 kg (65 lb).
5.8 Failure sensing and signaling equipment
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
5.8.1 The system shall possess a mechanism or process capable of detecting failures of electrical and mechanical components critical to the treatment processes and delivering a visible and audible signal to notify the owner of the failure. The system shall possess a mechanism or process capable of detecting a high water condition and delivering a visible and audible signal to notify the owner and service provider that the water level is above normal operating specifications or that flow is being diverted to a bypass function as described in Section 5.9. 5.8.2 The visual portion of the signal shall be conspicuous from a distance of 15 m (50 ft) from the system and its appurtenances when tested and evaluated in ambient light conditions of at least 1000 foot-candles. The audible portion of the signal for systems installed exterior to the building shall be between 70 and 90 dbA at 1.5 m (5 ft) and shall be discernable from a distance of 15 m (50 ft) from the system and its appurtenances. The audible portion of the signal for systems installed inside the building shall be between 60 and 80 dbA at 1.5 m (5 ft) and shall be discernable from a distance of 10 m (30 ft) from the system and its appurtenances. 5.8.3 The signals shall continue to be functional in the event of an electrical, mechanical, or hydraulic malfunction of the system. 5.8.4 In addition to the above, commercial graywater reuse treatment systems shall include remote telemetry capable of delivering notification by electronic communication, such as by phone or email, to the owner or operator of the system during detection of failures. 5.9 Flow design Systems shall have a designated flow path that is reflective of the entire treatment process. During periods of normal system operation, as well as periods of system and component malfunction, the design and construction of the system shall preclude discharge of wastewater from an opening external to the designated flow path. Components (treatment, storage or both) installed inside a home or building shall meet 5.9.1 and 5.9.2. 5.9.1 Reuse treatment systems shall possess a means of bypass for discharge of untreated water to a locally approved wastewater treatment and disposal system and shall be activated during periods of system malfunction. 5.9.2 Reuse treatment systems shall possess a means to control the volume of treated water in any storage vessel and shall prevent overflow to any location other than to a locally approved wastewater treatment and disposal system. 5.10
Dataplate and service label
5.10.1 Residential wastewater reuse treatment systems: The system shall have a permanent and legible data plate. The data plate shall include: - manufacturer's name and address; -
model number;
-
serial number;
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
-
rated daily hydraulic capacity of the system; and
- the system classification of single-family residential (R), or multi-family or commercial (C), as determined by the performance testing and evaluation requirements described herein. 5.10.2 Graywater reuse treatment systems: The system shall have a permanent and legible dataplate. The dataplate shall include: –
manufacturer's name and address;
–
model number;
–
serial number;
–
rated daily hydraulic capacity of the system;
– restrictions on the source of graywater treated by the system, being either laundry or bathing water or both, as determined by the performance testing and evaluation requirements described herein, and – the system classification of single-family residential (R), or multi-family or commercial (C), as determined by the performance testing and evaluation requirements described herein. 5.10.3 A clearly visible label or plate that provides instructions for obtaining service shall be permanently located near the failure signal.
6 Product literature 6.1 Owner's manual Each system shall be accompanied by a manufacturer-prepared owner's manual. The authorized representative shall provide the manual to the owner at the time of system installation. The manual shall be written so as to be easily understood by the intended reader and shall include, at a minimum: −
the system's model designation;
−
a statement designating the classification of the system: o residential or commercial; o graywater only or residential wastewater; o for graywater, laundry water only, bathing water only, or both laundry and bathing water
−
a confirming statement that the system meets the requirements in NSF/ANSI 350 {the Standard} corresponding to the designated classification;
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
−
a functional description of system operation, preferably including diagrams illustrating basic system design and flow path;
−
a clear statement of the end uses appropriate for the treated effluent discharged from the onsite reuse treatment systems; – a clear statement of examples of the types of waste that can be effectively treated by the system; – a list of household substances that, if discharged to the system, may adversely affect the system, the process, or the environment; – comprehensive operating instructions that clearly delineate proper function of the system, operating and maintenance responsibilities of the owner and authorized service personnel, and service-related obligations of the manufacturer; –
requirements for the periodic removal of residuals from the system;
– a course of action to be taken if the system is to be used intermittently or if extended periods of non-use are anticipated; –
detailed methods and criteria to be used to identify system malfunction or problems;
- a statement instructing the owner to reference the system dataplate in the event that a problem arises or service is required; – the name and telephone number of an appropriate service representative to be contacted in the event that a problem with the system occurs; and –
a description of the initial and extended service policies.
If not appearing on the system, electrical schematics for the system shall be included in the owner’s manual. 6.2 Additional product literature Manufacturers shall provide authorized representatives with additional product literature intended to accommodate all persons who may be involved in the installation, upkeep, or repair of systems. Each system shall be accompanied by manufacturer-prepared literature including specific instruction for system installation, operation and maintenance, and troubleshooting and repair. This information may be provided in the form of discrete manuals or may be combined into a comprehensive manual(s) as the manufacturer deems appropriate. 6.2.1
Installation manual
Manufacturers shall specify who is authorized to install their system, and provide comprehensive and detailed installation instructions to these authorized representatives. The manual shall be written so as to be easily understood by the intended reader and shall include, at a minimum:
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
– a numbered list of system components and an accompanying illustration, photograph, or print in which the components are respectively identified; –
design, construction, and material specifications for the system's components;
–
wiring schematics for the system's electrical components;
– off-loading and unpacking instructions including safety considerations, identification of fragile components, and measures to be taken to avoid damage to the system; – a process overview of the function of each component and the expected function of the entire system when all components are properly assembled and connected; – a clear definition of system installation requirements including plumbing and electrical power requirements, ventilation, air intake protection, bedding, hydrostatic displacement protection, water tightness, slope, and miscellaneous fittings and appurtenances; –
a sequential installation procedure;
– repair or replacement instructions in the event that a system possesses flaws that would inhibit proper functioning and a list of sources where replacement components can be obtained; –
a detailed start-up procedure; and
– statement that the system and installation shall comply with applicable state and local regulations. – systems designed for indoor restricted urban water use, such as toilet and urinal flushing, shall include a description of how the system should be plumbed to ensure availability of a potable water supply during periods when treated reuse water is not available, such as during maintenance and reuse treatment system malfunction. 6.2.2
Operation and maintenance manual
Manufacturers shall provide comprehensive and detailed operation and maintenance instructions to authorized representatives. The manual shall be written so as to be easily understood by the intended reader and shall include, at a minimum: –
a maintenance schedule for all components;
– requirements and recommended procedures for the periodic removal of residuals from the system; –
a detailed procedure for visual evaluation of system component functions;
–
recommended methods for collecting effluent samples; and
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
– the expected effluent quality produced by the operational system as established through analytical methods described or referenced in this Standard. 6.2.3
Trouble shooting and repair manual
Manufacturers shall provide comprehensive and detailed trouble shooting and repair instructions to authorized representatives. The manual shall be written so as to be easily understood by the intended reader and shall include, at a minimum: – a guide for visually evaluating the system and narrowing the scope of the problem based on alarm activation, effluent characteristics, system operation, and history; –
a sequential method for isolating specific component failure; and
–
a step-by-step guide for repairing or replacing all system components.
7 Other documentation The manufacturer shall prepare and maintain documentation for each system including, at a minimum: – – – –
a basic description of the system; drawings of the system; design basis data; and a comprehensive and detailed discussion of process fundamentals.
8 Performance testing and evaluation 8.1
Reuse treatment systems with capacities exceeding 5678 L/day (1500 gal/day)
For reuse treatment systems capacities exceeding 5678 L/day (1500 gal/day) shall be tested and evaluated in accordance with annex A. 8.2 Residential wastewater reuse treatment systems with capacities less than 5678 L/day (1500 gal/day) This section describes the methods used to evaluate the performance of residential wastewater reuse treatment systems. Systems shall be classified as Class R (residential) only, in accordance with section 8.6.2. The performance classification shall be based upon the evaluation of effluent samples collected from the system over a six-month period. 8.2.1
Preparations for testing and evaluation
8.2.1.1 The system shall be assembled, installed, and filled in accordance with the manufacturer's instructions. Page 11 of 42
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
8.2.1.2 The manufacturer shall inspect the system for proper installation. If no defects are detected and the system is judged to be structurally sound, it shall be placed into operation in accordance with the manufacturer's start-up procedures. If the manufacturer does not provide a filling procedure, ⅔ of the system's capacity shall be filled with water and the remaining ⅓ shall be filled with residential wastewater. 8.2.1.3 The system shall undergo design loading (see 8.2.2.2.1) until testing and evaluations are initiated. Sample collection and analysis shall be initiated within 3 wk of filling the system and, except as specified in section 8.6.1.2 shall continue without interruption until the end of the evaluation period. 8.2.1.4 If conditions at the testing site preclude installation of the system at its normally prescribed depth, the manufacturer shall be permitted to cover the system with soil to achieve normal installation depth. 8.2.1.5 Performance testing and evaluation of systems shall not be restricted to specific seasons. 8.2.1.6 When possible, electrical or mechanical defects shall be repaired to prevent evaluation delays. All repairs made during the performance testing and evaluation shall be documented in the final report. 8.2.1.7 The system shall be operated in accordance with the manufacturer’s instructions. However, routine service and maintenance of the system shall not be permitted during the performance testing and evaluation period. NOTE – The manufacturer may recommend or offer more frequent service and maintenance of the system but for the purpose of performance testing and evaluation, service and maintenance shall not be performed beyond what is specified in this Standard.
8.2.2
Testing and evaluation conditions, hydraulic loading, and schedules
8.2.2.1 Influent wastewater characteristics The 30-d average BOD5 concentration of the wastewater delivered to the system shall be between 100 mg/L and 300 mg/L. The 30-d average TSS concentration of the wastewater delivered to the system shall be between 100 mg/L and 350 mg/L. 8.2.2.2 Hydraulic loading and schedules The performance of the system shall be evaluated for 26 consecutive wk. During the testing and evaluation period, the system shall be subjected to 16 wk of design loading, followed by 7.5 wk (52 days) of stress loading, and then an additional 2.5 wk (18 days) of design loading. 8.2.2.2.1
Design loading
The system shall be dosed 7 days a week with a wastewater volume equivalent to the daily hydraulic capacity of the system. The following schedule shall be adhered to for dosing: Page 12 of 42
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
Time frame 6:00 a.m. to 9:00 a.m. 11:00 a.m. to 2:00 p.m. 5:00 p.m. to 8:00 p.m.
% rated daily hydraulic capacity approximately 35 approximately 25 approximately 40
NOTE – The individual dosage shall be no more than 10 gallons per dose, unless the residential wastewater reuse treatment system includes a dosage system that is based on a continuous flow, and be uniformly applied over the dosing periods.
8.2.2.2.2
Stress loading
Stress loading is designed to evaluate a system's performance under four non-ideal conditions. Systems shall be subjected to each stress condition once during the 6-month testing and evaluation period, and each of the four stress conditions shall be separated by 7 days of design loading (see 8.2.2.2.1).
8.2.2.2.2.1 Wash-day stress The wash day stress shall consist of 3 wash days in a 5-day period. Each wash day shall be separated by a 24-h period. During a wash-day, the system shall be loaded at times and capacities similar to those delivered during design loading (see 8.2.2.2.1), however during the first two dosing periods per day, the design loading shall include 3 wash loads (3 wash cycles and 6 rinse cycles). 8.2.2.2.2.2 Working-parent stress For 5 consecutive days, the system shall be subjected to a working-parent stress. During this stress, the system shall be dosed with 40% of its daily hydraulic capacity between 6:00 a.m. and 9:00 a.m. Between 5:00 p.m. and 8:00 p.m., the system shall be dosed with the remaining 60% of its daily hydraulic capacity, which shall include 1 wash load (1 wash cycle and 2 rinse cycles). 8.2.2.2.2.3 Power/equipment failure stress The system shall be dosed with 40% of its daily hydraulic capacity between 5:00 p.m. and 8:00 p.m. on the day the power/equipment failure stress is initiated. Power to the system shall then be turned off at 9:00 p.m. and dosing shall be discontinued for 48 h. After 48 h, power shall be restored and the system shall be dosed over a 3- h period with 60% of its daily hydraulic capacity, which shall include 1 wash load (1 wash cycle and 2 rinse cycles). 8.2.2.2.2.4 Vacation stress On the day that the vacation stress is initiated, the system shall be dosed at 35% of its daily hydraulic capacity between 6:00 a.m. and 9:00 a.m. and at 25% between 11:00 a.m. and 2:00 p.m. Dosing shall then be discontinued for 8 consecutive days (power shall continue to be supplied to the system). Between 5:00 p.m. and 8:00 p.m. of the ninth day, the system shall be dosed with 60% of its daily hydraulic capacity, which shall include 3 wash loads (3 wash cycles and 6 rinse cycles).
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Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
8.2.2.3 Dosing volumes The 30-d average volume of the wastewater delivered to the system shall be within 100% ± 10% of the system's rated hydraulic capacity. NOTE – All dosing days, except those with dosing requirements less than the daily hydraulic capacity, shall be included in the 30-d average calculation.
8.2.2.4 Color, odor, foam, and oily film assessments During the 6-month testing and evaluation, a total of three effluent samples shall be assessed for color, odor, foam, and oily film. The assessments shall be conducted on effluent composite samples selected randomly during the first phase of design loading (weeks 1 – 16), the period of stress loading (weeks 17 – 23.5), and the second phase of design loading (weeks 23.5 – 26). 8.3 Graywater reuse treatment systems with capacities less than 5678 L/day (1500 gal/day) This section describes the methods used to evaluate the performance of onsite residential and commercial graywater treatment systems. Systems shall be classified as Class R (residential), or Class C (commercial), in accordance with section 8.6. The performance classification shall be based upon the evaluation of effluent samples collected over a minimum 6-month testing period. Manufacturer’s that recommend a service frequency longer than 6-months shall be tested for the full period of the recommended service frequency. 8.3.1
Preparations for testing and evaluation of graywater reuse treatment systems
8.3.1.1 The system shall be assembled, installed, and filled in accordance with the manufacturer's instructions. 8.3.1.2 The manufacturer shall inspect the system for proper installation. If no defects are detected and the system is judged to be structurally sound, it shall be placed into operation in accordance with the manufacturer's start-up procedures. If the manufacturer does not provide a filling procedure, ⅔ of the system's capacity shall be filled with water meeting the specifications of section 8.3.2.1, and the remaining ⅓ shall be filled with graywater meeting the specifications of section 8.3.2.1.1, 8.3.2.1.2, or 8.3.2.1.3, as appropriate based upon manufacturer’s decision to test with bathing water only, laundry water only, or both. 8.3.1.3 The system shall undergo design loading (see section 8.3.2.2.1) until testing and evaluations are initiated. Sample collection and analysis shall be initiated within 3 wk of filling the system and, except as specified in section 8.6.1.2, shall continue without interruption until the end of the evaluation period. 8.3.1.4 If the system is to be installed outdoors, and conditions at the testing site preclude installation of the system at its normally prescribed depth, the manufacturer shall be permitted to cover the system with soil to achieve normal installation depth. 8.3.1.5 If the system is to be installed outdoors, performance testing and evaluation of systems shall not be restricted to specific seasons. Page 14 of 42
9/20/2010
Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared.
8.3.1.6 When possible, electrical or mechanical defects shall be repaired to prevent evaluation delays. All repairs made during the performance testing and evaluation shall be documented in the final report. 8.3.1.7 The system shall be operated in accordance with the manufacturer’s instructions. However, routine service and maintenance of the system shall not be permitted during the performance testing and evaluation period. NOTE – The manufacturer may recommend or offer more frequent service and maintenance of the system but for the purpose of performance testing and evaluation, service and maintenance shall not be performed beyond what is specified in this Standard.
8.3.2
Testing and evaluation conditions, hydraulic loading, and schedules
8.3.2.1
Graywater challenge water: Base water supply
A public water supply shall be used as the base water to which individual ingredients are added, as described in sections 8.3.2.1.1, 8.3.2.1.2, and 8.3.2.1.3. The 30-d average concentration of the base water supply shall meet or be adjusted to meet the following requirements: Parameter
8.3.2.1.1
Required range
Hardness
110 – 220 mg/L
Alkalinity
>40 mg/L as CaCO3
Graywater challenge water: Systems treating bathing source water only
Prepare the challenge water according to the following formula: Wastewater Components
Amount/100 L
Body wash with moisturizer
29.7 g
Toothpaste
3.1 g
Deodorant
2.0 g
Sun tan lotion
38.9 g
Shampoo
19.2 g
Conditioner
21.0 g
Lactic acid
2.8 g
Secondary effluent
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1
2L
Bath cleaner
10.3 g
Liquid hand soap 2 Test dust
22.8 g 10 g
9/20/2010
Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared. 1 2
See Annex C for example products. See ISO 12103-1, Road Vehicles – Test Dust for Filter Evaluation. The test dust shall meet the specification of ISO 12103-1, A2 – Fine test dust. A test dust that meets these specifications is available from Powder Technologies, Inc., P.O. Box 1464, Burnsville, MN 55337. www.powdertechusa.com
The 30-d average concentration of the bathing water delivered to the system shall be as follows: Parameter
Required range
TSS
80 – 160 mg/L
BOD5
130 – 180 mg/L
Temperature
25 – 35 °C
pH
6.5 – 8.0
Turbidity
50 – 100 NTU
Sodium
50 – 90 mg/L
Total phosphorous – P
3.0 – 7.0 mg/L
Total Kjeldahl nitrogen – N
4.0 – 8.0 mg/L
Conductivity
300 – 500 µS/cm
COD
250 – 400 mg/L
TOC
8.3.2.1.2
50 – 150 mg/L 3
4
2
3
Total coliforms
10 – 10 cfu/100 mL
E. coli
10 – 10 cfu/100 mL
Graywater challenge water: Systems treating laundry source water only
Prepare the challenge water according to the following formula: Wastewater Components
1
Liquid laundry detergent (2X)
10 g
Secondary effluent
2L
Liquid laundry fabric softener
2
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40.5 mL
2
Test dust
1
Amount/100 L
21.4 mL
Na2SO4
3.5 g
NaHCO3
2.5 g
Na2PO4
3.9 g
Boric acid
0.14 g
See Annex C for example products. See ISO 12103-1, Road Vehicles – Test Dust for Filter Evaluation. The test dust shall meet the specification of ISO 12103-1, A2 – Fine test dust. A test dust that meets these
9/20/2010
Tracking Number 350i1r1.7 New Standard - NSF 350 Onsite Residential and Commercial Water Reuse Treatment Systems © 2010 NSF International Issue 1, Draft 1.7 (September 16, 2010) This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared. specifications is available from Powder Technologies, Inc., P.O. Box 1464, Burnsville, MN 55337. www.powdertechusa.com
The 30-d average concentration of the laundry water delivered to the system shall be as follows: Parameter
Required range
TSS
80 – 160 mg/L
BOD5
130 – 180 mg/L
Temperature
25 – 35 °C
pH
6.5 – 8.0
Turbidity
50 – 100 NTU
Sodium
50 – 90 mg/L
Total phosphorous – P Total Kjeldahl nitrogen – N Conductivity
< 2 mg/L 3.0 – 5.0 mg/L 300 – 500 µS/cm
COD
250 –00 mg/L
TOC
50 – 150 mg/L 3
4
2
3
Total coliforms
10 – 10 cfu/100 mL
E. coli
10 – 10 cfu/100 mL
8.3.2.1.3 Graywater challenge water: Systems treating bathing and laundry source waters combined Prepare the challenge water by combining 53 L of section 8.3.2.1.1 and 47 L of section 8.3.2.1.2 for each 100 L of challenge water. The 30-d average concentration of the graywater delivered to the system shall be as follows: Parameter TSS
80 – 160 mg/L
BOD5
130 – 180 mg/L
Temperature pH
25 – 35 °C 6.5 – 8.0
Turbidity
50 – 100 NTU
Sodium
50 – 90 mg/L
Total phosphorous – P Total Kjeldahl nitrogen – N Conductivity COD
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Required range
