membrane bioreactor(mbr) - um

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MEMBRANE BIOREACTOR(MBR)

FERDOWSI UNIVERSITY OF MASHHAD

PRESEN TER: MA HSA I ZA DPA N AH(9213478015 )PROFESSOR: DR . G HESHLAG HI

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Outline:

1. Introduction

2. MBR in wastewater treatment

3. Membrane (module-configuration)

4. Fouling mechanisms

5. Anti-fouling strategies

6. Membrane separation processes

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Introduction Membrane bioreactor: membrane process +suspended

growth bioreactor

And is now widely used for municipal and industrial wastewater treatment.

The original process was introduced by Dorr-Oliver.

• Combined the use of an activated sludge bioreactor with a cross flow membrane filtration loop.

The breakthrough for the MBR came in 1989 with the idea of Yamamoto and co-workers to submerge the membranes in the bioreactor.

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Schematic of conventional activated sludge process (top) and membrane bioreactor (bottom)

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Membrane:

Semi permeable membrane: a phase acting as as a barrier that prevents the net motion of mass but permits the regulated and restricted passage of one or more species.

Commercial membrane are generally classified according to:

1. the chemical nature of the material that are made of.

2. the morphology of the wall

3. the separation mechanism

4. the material physical-chemical properties

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Membrane modules:•

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Membrane modules:

•

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Membrane modules:

•

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Membrane modules:•

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Two different MBR configurations:

• Side stream (external)

• Submerged (internal)

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Internal (submerged)

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External(side stream)

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Fouling and fouling control:

• The MBR filtration performance inevitably decreases with filtration time.

• membrane fouling is the most serious problem affecting system performance.

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Fouling mechanism:

1. Complete Blocking Filtration

2. Standard Blocking Filtration

3. Intermediate Blocking Filtration

4. Cake Filtration

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Fouling mechanisms:

hermia model for fouling mechanism:

General equation:

1. Complete Blocking Filtration

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2. Standard Blocking Filtration

3. Intermediate Blocking Filtration

4. Cake Filtration

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Anti-fouling strategies:

1. The use of ultraviolet radiation to reduce membrane fouling

2. The use of ultrasound to reduce membrane fouling

3. Physical and chemical cleaning in order to reduce membrane fouling

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Membrane separation processes

Reverse osmosis

Ultra-filtration

Micro-filtration

Nano- filtration

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Reverse osmosis

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Membrane technology comparison

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Membrane technology comparison

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