MBR contron
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2. Membrane Bioreactor (MBR)
1
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.
Membrane Bioreactor (MBR) Bioreactor (MBR)
2
A combination of biological WWT (e.g. activatedsludge) and membrane filtration as a measure for solid-liquid separation.
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.
Image of Membrane Filtration on MBRFiltration on MBR
3
Filtrate
Stream of bubble and activated sludge
MembraneActivatedsludge
Air bubblesFor washing
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.
Membrane and Removable Materialsand Removable Materials
4
Reverse Osmosis (RO)
Nanofirtration (NF)
Ultrafiltration (UF)
Microfiltration (MF)
Sand filtration
Allegra
Virus
Pore size (μm)1 1010-110-210-310-4
Membrane
Removable materialsProtozoa
Organic matters
Odor materials Bacteria
Anion surfactant
Humic acid
Ion
0.1~0.4μmMBR
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.
Membrane Type used for MBR
5
Flat sheetFlat sheet Hollow FiberHollow Fiber Ceramic
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.
Advantages of MBR over Conventional Activated Sludge Process
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- Complete rejection of suspended solids.- Higher mixed liquor suspended solids (MLSS) (>8 g/L).- Smaller footprint (< 6hr for biological nutrient removal).- Smaller sludge production.- Simple monitoring parameters (e.g. transmembrane
pressure (TMP) ).
Conventional activated sludge process MBR process
Fine screen Membrane
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved. 7
Various Evaluation of MBR technology
MBR is a core technology for simultaneous dissolving current issues on sewage works in Japan and other countries due to its excellent characteristics
MBR
Small-scaleplants
Disasterrecovery
Large-scaleplants
Reclamationof effluent
Retrofitting
Advancedtreatment
Overseasdeployment
Riskreduction
•Excellent and stable effluent quality•Bacteria free effluent •Nitrogen and phosphorus removal•Small footprint•Easy operation
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved. 8
Developments of MBR in Japan Sewage Works Agency
10 11 1398 99 00 01 02 03 04 05 06 07 08 09 14
■ Number of MBR in operation at the end of fiscal year
12 13 14
1st phase 2nd phase 3rd phase
Basicfactors
Reduction of operation costs
Large-scaleapplication
Application to combinedsystem and/or more
energy-saving
4th phase
■ Technology evaluation of MBR★★
2003.111st 2nd
★★■ JS Design guideline of MBR
★2003.4 2005.41st edition Revised edition
■ Pilot-scale studies
36
9 10 1115
18
1
Stared operation of the first MBR(Fukuzaki WWTP, 2,100m3/d)
★★2005.3
★★2011.3
Stared operation of the largest MBR(Sanbou WWTP, 60,000m3/d)
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.
Example of MBR Facilities in Japan
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Fukuzaki WWTP-Present treatment capacity 4,200m3/d( entire capacity 12,500m3/d)
-The first MBR installation for Japanese sewage plant
Fukuzaki WWTP-Present treatment capacity 4,200m3/d( entire capacity 12,500m3/d)
-The first MBR installation for Japanese sewage plant
Sanbo WWTP-Treatment capacity:60,000m3/d-The largest MBR in Japan-First application to retrofitting of existingfacility and combined sewer system inJapan
Sanbo WWTP-Treatment capacity:60,000m3/d-The largest MBR in Japan-First application to retrofitting of existingfacility and combined sewer system inJapan
Aeration tank
Primary Settling tank
Fine Screen
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved. 10
Development of large-scale MBR on the 3rd phase pilot-scale studies
A variety of system configuration was developed to fit to restrictions of existing facilities and requirements of upgrade.
A
B
C
D
Membranetype
Hollow fiber
Ceramic
Flat sheet
Flat sheet
SubmergedSeparate
External
SubmergedIntegrated
SubmergedSeparate
Biologicaltreatmentprocess
A2O
A2O
UCT
UCT
MBRsystem Others
Combined with RO for reclamation
Gravity filtrationLarge-size membrane
Gravity filtrationNH4-N controlCombined with RO
A
B
C D
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved. 11
Process Flow of UCT-MBR Process
M
PI F
P
M
P
Anaerobic tankHRT=1hr
Anoxic tankHRT=2hr
Aerobic tankHRT=3.2hr
FM
P
Excess sludge
Permeate
Chemical
PAnaerobicTank mixer
Anoxic tankmixer
Nitrified liquor Airlift pump
Auxiliary aerationblower
B B
Membrane air scour blower
Chemical dilution tank Chemical tank
Syphonfiltration
Membraneunit
diffuser
Excess sludge pump
Raw water or Primary effluent
Denitrified liquor Airlift pump
①Large-size membrane unit
④Vertical axis mixer ②Syphon filtration system
③MLSS recirculation with airlift pump
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved. 12
Treatment Efficiency in UCT-MBR Process
0
1
2
3
4
5
6
6/1 7/1 8/1 9/1 10/1 11/1 12/1 1/1 2/1 3/3 4/3
T-P
(m
g/L) Influent
Permeate
Design influent 4.25mg/L
Design effluent 0.66mg/L
0255075
100125150175200
6/1 7/1 8/1 9/1 10/1 11/1 12/1 1/1 2/1 3/3 4/3In
fluent
BO
D(m
g/L)
0246810121416
Perm
eate
BO
D(m
g/L)
Influent
permeateDesign influent 120mg/L
Design effluent 3mg/L
influenteffluent
0
10
20
30
40
6/1 7/1 8/1 9/1 10/1 11/1 12/1 1/1 2/1 3/3 4/3
T-N
(m
g/L)
Influent
Permeate
Design influent 31.5mg/L
Design effluent 7mg/L
Biological Oxygen Demand (BOD)
Total Nitrogen (T-N)
Total Phosphorus (T-P)
Copyright (c) 2012 Japan Sewage Works Agency All rights reserved. 13
Energy Saving Efficiency in UCT-MBR Process
0 0.2 0.4 0.6 0.8 1
電力量試算値(kWh/m3)
省エネMBR
従来MBR
膜洗浄用送風機 補助散気用送風機 膜ろ過ポンプ
循環ポンプ 攪拌機
0.91kWh/m3
0.48kWh/m3
Conven-tional MBR
UCT-MBR
Trial calculation of energy consumption
Permeate pumpTank mixingAuxiliary aerationMembrane cleaning
MLSS recirculation
●large-size membrane unit●siphon filtration●airlift pump●vertical axis mixer
47% reduction