The Anaerobic Fluidized Bed Membrane Bioreactor for Energy-Efficient Wastewater Reuse Perry L. McCarty Department of Civil and Environmental Engineering Stanford University
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The Anaerobic Fluidized Bed Membrane Bioreactor for
Energy-Efficient Wastewater Reuse
Perry L. McCarty Department of Civil and Environmental Engineering
Stanford University
2
Compact water recycling
systems
Distributed treatment system planning
Energy-positive wastewater treatment
Open water unit process wetlands
Ecosystem rehabilitation
Re-inventing the Nation’s Urban Water Infrastructure NSF Engineering Research Center
Research Issues
ReNUWIt Leadership Team
3
Stanford, UC Berkeley, New Mexico State, Colorado Sch. of Mines
Seeking Sustainable Solutions
Economic & social benefits Save energy & water
Increase resiliency & resource recovery
Enhance acceptance & the urban environment
4
Codiga Resource Recovery Center
Wastewater and Waste Organics
High Value
Products
Stanford’s Pilot-scale test bed facility
Director Craig
Criddle
Prof. Jaeho Bae
Prof. Jon Kim
Chungheon Shin
Question
• Can we treat municipal wastewater 100% anaerobically to achieve net energy production while meeting effluent quality standards, and at lower cost than by conventional aerobic treatment ?
Fludized Bed Anaerobic Treatment of Industrial Wastewaters
Objective – High SRT and short HRT
Staged Anaerobic Fluidized MBR (SAF-MBR)
Kim et al., Environ. Science & Technology, 45:576(2011)
Influent
TCOD
523
mg/L
Recycle
Permeate
Effluent
TCOD
60
mg/L
GAC Particles
First Stage Second Stage
with membrane
Influent
Methane Methane
Recycle
Effluent
Permeate
Fluidized Bed Reactor Membrane Bioreactor
Membranes
12 m3/day (6 h HRT) SAF-MBR Pilot Plant Treating South Korea
Primary Effluent
Pilot SAF-MBR Operation • Wastewater characteristics
– COD 300 ± 60 mg/L
– BOD5 160 ± 45 mg/L
• Hydraulic Retention Time
– AFBR 2 hours
– AFMBR 2.6 to 4.8 hours
– Total 4.6 to 6.8 hours
• AFMBR Flowrate 4 to 7 m3/d
70
75
80
85
90
95
100
0 100 200 300 400 500
Pe
rce
nt
Re
mo
val
Day of Operation
Percent BOD5 Removal
20- 15
14- 8
15- 25
26- 32
25- 14
13- 9
Temp. Range oC }
Shin et al., Bioresource Technology, 159, 95-103 (2014)
05
1015202530354045
0 100 200 300 400 500
mg
/L
Day of Operation
SAF-MBR Effluent BOD5
} Temp. Range oC
Shin et al., Bioresource Technology, 159, 95-103 (2014)
20- 15
14- 8
15- 25
26- 32
25- 14
13- 09
05
1015202530354045
0 100 200 300 400 500
mg
/L
Day of Operation
SAF-MBR Effluent BOD5
} Temp. Range oC
Shin et al., Bioresource Technology, 159, 95-103 (2014)
20- 15
14- 8
15- 25
26- 32
25- 14
13- 09
USA EPA Upper Limit
Biosoids Production
0.05 kg VSS/kg COD and
already digested and
less than half that from aerobic
treatment
Shin et al., Bioresource Technology, 159, 95-103 (2014)
Superior removal of pharmaceuticals: Anaerobic (SAF-MBR) vs aerobic treatment
SAF-MBR at Stanford McCurry et al., Environ. Sci. & Technol. Letter, 1:459, 2014
Monterey County Water
Recycling Project
Water Reclamation Plant
Irrigated land
Monterey Regional Water Pollution Control Agency Recovers Water, Energy, and Nutrient Resources
• Largest irrigated crop wastewater recycle in U.S.
• Produces 76,000 m3/day recycled water
• Irrigates 5,000 hectares
• Through anaerobic biosolids treatment and cogeneration, produces 50% of WWTP’s energy needs
• No energy wasted for nitrogen oxidation – all is used as plant fertilizer
Monterey Water Reclamation Plant
Google - 2014
Monterey Water Reclamation Plant
SAF-MBR Footprint
Google - 2014
Thank you!
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