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

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. Anti-fouling strategies 6. Membrane separation processes 2

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. 3

Schematic of conventional activated sludge process (top) and membrane bioreactor (bottom) 4

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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 6

Membrane modules: • 7

Membrane modules: • 8

Membrane modules: • 9

Membrane modules: • 10

Two different MBR configurations: • Side stream (external) • Submerged (internal) 11

Internal (submerged) 12

External(side stream) 13

Fouling and fouling control: • The MBR filtration performance inevitably decreases with filtration time. • membrane fouling is the most serious problem affecting system performance. 14

Fouling mechanism: 1. Complete Blocking Filtration 2. Standard Blocking Filtration 3. Intermediate Blocking Filtration 4. Cake Filtration 15

Fouling mechanisms: hermia model for fouling mechanism: General equation: 1. Complete Blocking Filtration 16

2. Standard Blocking Filtration 3. Intermediate Blocking Filtration 4. Cake Filtration 17

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 18

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Membrane separation processes  Reverse osmosis  Ultra-filtration  Micro-filtration  Nano- filtration 20

Reverse osmosis 21

Membrane technology comparison 22

Membrane technology comparison 23