mbr contron

2. Membrane Bioreactor (MBR)

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Copyright (c) 2012 Japan Sewage Works Agency All rights reserved.

Membrane Bioreactor (MBR) Bioreactor (MBR)

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A combination of biological WWT (e.g. activatedsludge) and membrane filtration as a measure for solid-liquid separation.


Image of Membrane Filtration on MBRFiltration on MBR

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Filtrate

Stream of bubble and activated sludge

MembraneActivatedsludge

Air bubblesFor washing


Membrane and Removable Materialsand Removable Materials

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Reverse Osmosis (RO)

Nanofirtration (NF)

Ultrafiltration (UF)

Microfiltration (MF)

Sand filtration

Allegra

Virus

Pore size （μm）１１0１0-1１0-2１0-3１0-4

Membrane

Removable materialsProtozoa

Organic matters

Odor materials Bacteria

Anion surfactant

Humic acid

Ion

0.1~0.4μmMBR


Membrane Type used for MBR

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Flat sheetFlat sheet Hollow FiberHollow Fiber Ceramic


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


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

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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)


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


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


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

ＢＢ

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


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)


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

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