MEMBRANE BIOREACTOR(MBR) FERDOWSI UNIVERSITY OF MASHHAD PRESENTER: - - PowerPoint PPT Presentation

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MEMBRANE BIOREACTOR(MBR) FERDOWSI UNIVERSITY OF MASHHAD PRESENTER: - - PowerPoint PPT Presentation

Jul 20, 2023 23 likes •253 views

MEMBRANE BIOREACTOR(MBR) FERDOWSI UNIVERSITY OF MASHHAD PRESENTER: MAHSA IZADPANAH(9213478015) PROFESSOR: DR. GHESHLAGHI 1 Outline: 1. Introduction 2. MBR in wastewater treatment 3. Membrane (module-configuration) 4. Fouling mechanisms 5.

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MEMBRANE BIOREACTOR(MBR)

FERDOWSI UNIVERSITY OF MASHHAD

PRESENTER: MAHSA IZADPANAH(9213478015) PROFESSOR: DR. GHESHLAGHI

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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
  • f 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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