east valley water district mbr technologies - watereuse · pdf fileeast valley water district...
TRANSCRIPT
![Page 1: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/1.jpg)
East Valley Water District
MBR Technologies
January 20, 2015
Presenters: Scott Goldman, P.E.
![Page 2: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/2.jpg)
Presentation Outline
MBR Description
MBR Technology
Advantages to MBR
Disadvantages to MBR
Ancillary Equipment
Key Design Considerations
Case Studies
![Page 3: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/3.jpg)
MBR Description
Two parts
• Biological reactor
• Solids separation by membrane filtration
Filtered effluent meeting Title 22 filtration requirements
• Turbidity does not exceed any of the following: 0.2 NTU more than 5% of the time within a 24-hour period and 0.5 NTU at any time
Filtrate (Treated WW)
RAS
Feed
Bioreactor Membrane (Liquid/Solids Separator)
WAS
![Page 4: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/4.jpg)
Membrane Pore Size
Pore size
• 0.04 micron (avg)
• 0.1 micron (max)
Membrane fibers have billions of microscopic pores on the surface
Pores form a barrier to impurities while allowing water molecules to pass
Electron microscope view of
membrane surface
GE ZeeWeed® Membrane
Fibers
![Page 5: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/5.jpg)
Membranes for Water Treatment
Conventional Pretreatment
![Page 6: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/6.jpg)
Membrane Types – Hollow Fiber Manufacturers
GE (Zenon) – 23 Municipal CA installations
Evoqua (formerly Siemens) – 10 Municipal CA installations
Koch/Puron – 3 municipal CA installations
Design
Inside-out vs Outside-in
Also Asahi, Mitsubishi Simens bought USFilter
GE ZeeWeed®
Koch PURON®
![Page 7: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/7.jpg)
Membrane Types – Flat Plate Manufacturers
Kubota
Enviroquip/Ovivo
Design
Membrane supports biofilm
Filtered
permeate
Biofilm Air
bubbles
Crossflow Membrane
Cartridge
Kubota Submerged
Membrane Unit
Enviroquip/Ovivo
Submerged Membrane Unit
![Page 8: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/8.jpg)
Membrane Types – Tubular
Manufacturers
GE
Koch
Dynatec
Pall
Design
Shell houses multiple tubular membranes
Inside-out flow
Filtered
Permeate
Feed Stream Retentate
Dynatec
DynaLiftTM
![Page 9: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/9.jpg)
Advantages of MBR
High quality (low turbidity, low BOD, low TSS) permeate for regulatory or reuse purposes
Smaller plant footprint (Higher MLSS – 8,000 mg/L)
Not reliant on MLSS settling
Pretreatment for RO system
Good Clarity for UV disinfection
![Page 10: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/10.jpg)
Potential Disadvantages of MBR
Procurement (Manufacturers vary significantly)
Capital and operating cost
Higher energy
Fine screening requirement (2 to 3 mm screen)
![Page 11: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/11.jpg)
Membrane Maintenance Air scour – separate blower system
Backpulse – reversing flow through membrane (hourly)
Maintenance cleaning (backpulse with hypochlorite or citric acid) (1-2 times per week)
Chemical soak recovery cleaning (2-6 times per year)
ZeeWeed® Base Diffuser
Clean-In-PlaceTank (Filtrate from membrane)
Process Tank Water
Backwash Cleaning (Reverse Flow with Filtrate)
X-section
Chemical Soak
Backwash Cleaning
![Page 12: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/12.jpg)
Ancillary Facilities and Equipment
Fine screening (+/- 2 mm)
Membrane blowers Backpulse units Chemical feed
systems • Citric acid, sodium
hypochlorite, carbon addition, pH control
Bridge crane (membrane maintenance)
Drum Screen
![Page 13: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/13.jpg)
Case Studies - Hollister
MBR selected due to potential salinity reduction needs
ADWF: 5.0 MGD, PHF: 10.0 MGD
Grinding and screening issues ahead of a Zenon MBR
• Drum screen overwhelmed and panel failed
![Page 14: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/14.jpg)
Case Studies – Thunder Valley Casino
Lincoln, CA
Avg. Flow: 0.2-0.3 MGD, Plant capacity: 0.7 MGD
Fine screen only (no coarse screen, no grit)
Expanded from 3 to 4 trains in 2010
• Replaced Zenon MBR (pre-GE) with Koch
• Ragging, cleaning difficulties and membrane breakage
![Page 15: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/15.jpg)
Case Studies – Malibu
New MBR plant
Effluent Disposal: Groundwater Injection
Avg. Annual Flow: 0.095 MGD, Max Day: 0.14 MGD, Peak Hour: 0.33 MGD
Coarse screen, grit removal and fine screen
Designed around GE Zenon • Considered hollow fiber only (Siemens and Koch)
Chemicals • Sodium hypochlorite, citric acid, sodium hydroxide
and acetate
![Page 16: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/16.jpg)
Case Studies – East Valley Water District
Recycled Water Feasibility Study in October 2014 for new Sterling Recharge Facility
Surface application of recycled water for IPR
Existing flows 6 MGD, projected flows 10 MGD
Recommended MBR with UV disinfection – compared against SBR
System Attribute SBR System MBR System
Operational Stability and Reliability
Effluent upsets can be caused by poor settling
More robust process capable of handling variations in loading without upset
Effluent Water Quality Secondary Tertiary
Footprint Larger Smaller
Expansion Potential Concrete tanks inconvenient for future expansion
Modular – Easy
Incorporating RO Adv. Treatment
Tertiary filtration process required before advanced treatment
Can be directly incorporated upstream of RO
Public Concerns Higher odor complaints Relatively smaller with enclosed units
![Page 17: East Valley Water District MBR Technologies - WateReuse · PDF fileEast Valley Water District MBR Technologies January 20, 2015 Presenters: Scott Goldman, P.E. Presentation Outline](https://reader030.vdocuments.net/reader030/viewer/2022020302/5aaffc097f8b9a190d8e07f9/html5/thumbnails/17.jpg)
Questions