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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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