Understanding Membrane Fouling at High Organic Loading Rates in the Submerged Membrane Bioreactor Treating Municipal Wastewater R. Shane Trussell, P.E., Nam Jung Jang, Rion Merlo, Slawomir Hermanowicz, and David Jenkins Department of Civil and Environmental Engineering University of California, Berkeley March 8, 2005
29
Embed
Understanding Membrane Fouling at High Organic …...Understanding Membrane Fouling at High Organic Loading Rates in the Submerged Membrane Bioreactor Treating Municipal Wastewater
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Understanding Membrane Fouling atHigh Organic Loading Rates in theSubmerged Membrane BioreactorTreating Municipal Wastewater
R. Shane Trussell, P.E., Nam Jung Jang, Rion Merlo,Slawomir Hermanowicz, and David Jenkins
Department of Civil and Environmental EngineeringUniversity of California, Berkeley
March 8, 2005
Outline
• Introduction• Rationale• Materials and Methods• Results• Conclusions• Acknowledgements
Introduction• Membrane Bioreactor
(MBR)– Modified activated
sludge process– UF/MF membrane
• Two configurations– External (EMBR)– Submerged (SMBR)
Primary TreatedWastewater
BackwashWater
Secondary
Clarifier
WASTE
Reverse
Osmosis
Feedwater
MicrofiltrationConventional
Aeration Basin
WASTE
Reverse
Osmosis
Feedwater
SMBR
Aeration Basin
(Equivalent toa 3 mm screen)
Flow Schemes for the SMBR and ConventionalActivated Sludge Process
Process Limitation
CAS• Decline in effluent
water quality– High effluent COD– High effluent SS
• Treatment capacityremains unaffected
MBR• No decline in effluent
water quality• Membrane fouling
– Loss of treatmentcapacity
Outline
• Introduction• Rationale• Materials and Methods• Results• Conclusions• Acknowledgements
Rationale
• The SMBR process is currently limited to an MLSSconcentration of approximately 10 g/L
• The F/M ratio is a key parameter to optimize reactortank design– Small tank (low HRT)– Small tank (high F:M)
!
F
M=
So
"H#X
MLVSS
Effect of F/M on Steady-State Fouling Rate
y = 1.661x2.1977
R2 = 0.9517
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
F/M, g COD/g VSS.d
Ste
ad
y-S
tate
Fo
ulin
g R
ate
@ 2
0oC
, L
MH
/bar. d
3 210 5 4
MCRT, d
* Proceedings of WEFTEC 2004
Outline
• Introduction• Rationale• Materials and Methods• Results• Conclusions• Acknowledgements
Equipment and Apparatus
• Bench-scale SMBR• Treating primary
effluent from theCity of SanFrancisco’s SEP– COD = 325 mg/L– TSS = 98 mg/L