Integration Integration of of MBR MBR Technology Technology and and Desalting Desalting Membranes Membranes for for Water Water Reuse Reuse
James James DeCarolis, DeCarolis, Samer Samer Adham, Adham, Joan Joan Oppenheimer Oppenheimer William William H. H. Pearce, Pearce, Larry Larry Wasserman, Wasserman, Membrane Membrane Technology Technology Conference Conference & & Exposition Exposition March -9 2005 March 66-9 2005 Phoenix, Phoenix, Arizona Arizona
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Acknowledgments •• USEPA, USEPA, Bruce Bruce Macler, Macler, Ph.D., Ph.D., Vance Vance Fong, Fong, P.E. P.E. •• Metropolitan Metropolitan Water Water District District of of Southern, Southern, CA CA (DRIP), (DRIP), Sun Sun Liang, Liang, Ph.D., Ph.D., P.E. P.E. •• San San Diego Diego County County Water Water Authority, Authority, Cesar Cesar Lopez Lopez •• Bureau Bureau of of Reclamation Reclamation (USBR), (USBR), Water Water Treatment Treatment Engineering Engineering and and Research Research Group Group
2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Acknowledgments (cont.) •• City City of of San San Diego Diego MWWD, MWWD, Steve Steve Lagos, Lagos, Neil Neil Tran, Tran, Dwight Dwight Smith Smith •• Membrane Membrane Suppliers, Suppliers, Saehan, Saehan, Hydranautics, Hydranautics, Osmonics, Osmonics, Kubota, Kubota, Zenon Zenon and and Mitsubishi Mitsubishi •• EDC/PPCP EDC/PPCP Sample Sample Analysis, Analysis, Greg Greg Loraine Loraine (SDSU) (SDSU) and and Shane Shane Snyder Snyder (SNWA) (SNWA)
2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Outline of Discussion •• Project Project Background Background •• Materials Materials and and Methods Methods •• MBR MBR & & NF/RO NF/RO Performance Performance Data Data •• EDC/PCPPs EDC/PCPPs Analysis Analysis •• Cost Cost Estimate Estimate Analysis Analysis •• Conclusions Conclusions
2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Project Background •• Funding Funding provided provided by by the the USEPA USEPA under under DRIP DRIP to to evaluate evaluate MBR MBR as as pretreatment pretreatment to to RO RO •• Project Project was was partially partially conducted conducted in in parallel parallel with with USBR USBR funded funded project project aimed aimed at at optimizing optimizing various various MBR MBR Systems Systems for for water water reuse reuse •• Conducted Conducted at at the the PLWTP PLWTP located located in in San San Diego Diego ➙ ➙ PLWTP PLWTP uses uses 11 MGD MGD Potable Potable Water Water for for Industrial Industrial use use
➙ ➙ Wastewater Wastewater at at PLWTP PLWTP is is inherently inherently high high in in salt salt (TDS=1,600 (TDS=1,600 mg/L) mg/L) ➙ ➙ City City considering considering MBR MBR ➨ ➨ RO RO System System to to meet meet Reclaimed Reclaimed Water Water Needs Needs 2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Project Objectives •• Evaluate Evaluate MBR MBR Systems Systems recently recently introduced introduced to to US US Market Market •• Assess Assess the the Impact Impact of of adding adding Coagulant Coagulant and and Polymer Polymer to to the the MBR MBR Feed Feed Water Water on on MBR MBR Performance Performance •• Evaluate Evaluate MBR MBR performance performance under under extreme extreme operating operating conditions conditions (Increased (Increased Flux, Flux, Low Low HRT) HRT)
2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Project Objectives •• Evaluate Evaluate several several different different desalting desalting membranes membranes (NF/RO) (NF/RO) following following pretreatment pretreatment by by MBR MBR •• Evaluate Evaluate the the ability ability of of commercially commercially available available MBR/RO MBR/RO Process Process units units to to Remove Remove EDC/PPCPs EDC/PPCPs from from advanced advanced primary primary effluent effluent •• Perform Perform cost cost analysis: analysis: 1.) 1.) compare compare cost cost of of conventional conventional and and MBR MBR as as pretreatment pretreatment to to RO RO 2.) 2.) determine determine the the cost cost associated associated with with RO RO during during wastewater wastewater reclamation reclamation 2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Material and Methods
2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Pilot Testing •• Performed Performed pilot pilot testing: testing: train train consisted consisted of of MBR MBR ➨ ➨ UV/chloramine UV/chloramine ➨ ➨ NF/RO NF/RO •• Phase Phase II -- Operated Operated New New MBR MBR Systems Systems on on Raw Raw Wastewater Wastewater and and Advanced Advanced Primary Primary Effluent Effluent •• Phase Phase IIII -- Operated Operated Established Established Suppliers Suppliers on on advanced advanced primary primary effluent effluent (tested (tested extreme extreme operating operating conditions) conditions) •• Throughout Throughout MBR MBR testing testing operated operated RO/NF RO/NF downstream downstream of of MBR MBR -- in in all all tested tested 44 different different desalting desalting membranes membranes flux flux 10-12 10-12 gfd gfd FWR FWR 50 50 -75% -75% 2005 © American Water Works Association - Membrane Tech. Conference (All Rights Reserved)
Pilot Treatment Train BIOLOGICAL
MBR
REVERSE OSMOSIS
FOULING CONTROL Feed Wastewater (Influent or Primary Effluent)
MBR Effluent
(S1)
(S3)
RO Permeate
(S2) (S4)
0.8 mm Screen
Option 1
RO
UV
(S5)
Option 2 RO Concentrate
Aerobic tank
Chlorine
Ammonium Chloride
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MBR Pilot Systems (New Suppliers)
KUBOTA
US Filter
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MBR Pilot Systems (Established)
MITSUBISHI
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ZENON
MBR Membranes Specifications Units Commercial Designation Membrane Classification Membrane Configuration Approx. Size of Element (LxWxH) Number of Sheets per membrane cassette Number of Fibers per membrane cassette Inside Diameter of Fiber Outside Diameter of Fiber Length of Fiber Active Membrane Area (MBR Pilot) 1
Flow Capacity (MBR Pilot) Flow Direction Nominal Membrane Pore Size Absolute Membrane Pore Size Membrane Material/Construction
Recommended Design Flux Standard Testing pH range Vacuum Pressure for System 1
Kubota
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Type 510 MF Vertical mm 490X6X1000 --100 --------mm ----mm ----m ----2 2 1721 (160) ft (m ) gpm 17.6 --outside - in micron 0.4 micron ----chlorinated --polyethylene; flat sheet 2 gfd (L/h-m ) 14.7 (24.9) --5.8 - 8.6 psi (bar)
