mbr contron

2. Membrane Bioreactor (MBR)

1

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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

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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

6

- 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

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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

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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

9

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

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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

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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

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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)

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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