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THE MECHANISM OF BIOFILM FORMATION ON REVERSE OSMOSIS (RO) MEMBRANES Harvey Winters Professor - Fairleigh Dickinson University - USA REF# IDA_DM2010-Winters ABSTRACT Membrane fouling, especially biofouling, is the greatest impediment to successful membrane water-reuse involving reverse osmosis (RO) membranes. Because many parts of the world, including Syria, have water scarcity problems, water reuse facilities have increased in numbers, but most are operated in an efficient manner due to the biofouling problem. The main indicator of biofouling in water re-use facilities is the flux decline associated with an increase in pressure drop and/ or trans-membrane pressure. The first step in the biofilm formation on the RO membrane is the rapid adsorption of acidic exopolymeric substances (EPS) present in the feed water after membrane pretreatment (MBR, MF, or UF). These EPS are acidic glycoproteins, acidic polysaccharides, humic-like material or acidic transparent exopolymeric particles (TEP). This process is referred to as “conditioning” and takes several days, but few bacteria will attach until this conditioning takes place. Biofilm formation is a combination of nutrient and concentration polarization (CP) events. The growth of the biofilm on the membrane surface is controlled by the level of CP through interplay between CP and nutrient concentration at the membrane wall. It has also been proposed that the deposition of the acidic EPS onto the membrane surface depends also on the level of CP. The biofilm is formed from viable but non-culturable (VBNC) bacteria in the feed water. The VBNC are resistant to chlorine and chloramine disinfection and interact with the EPS at the membrane surface to form a matrix of cells and extracellular slime material which is referred to as the biofilm. 38 Water Reuse and Desalination: Experience and Opportunity TECHNICAL PROGRAM
Prof Dr. Gamal Khedr Head of Water Technologies Centre - Technology Experts Global – Kingdom of Saudi Arabia EDUCATIONAL BACKGROUND Doctorat d’Etat és Sciences, University of Strasbourg, France, (1975). PROFESSIONAL EXPERIENCE Professor, National Research Centre Cairo, Egypt, since (1985). • Consultant, Water Desalination/Treatment Ministry of Water & Electricity, Saudi Arabia. • Vice President for Technical Affairs, Preussag Arabia. • Head of Water Technologies Centre, Technology Experts Global, Saudi Arabia. ADDITIONAL INFORMATION • Member of IDA, EDS, AWWA, SFC. • Published 49 articles in International Journals. Water Reuse and Desalination: Experience and Opportunity TECHNICAL PROGRAM 39
Page 1: September 28-29, 2010 The Cham Pala
Page 7 and 8: Dear friends and colleagues: It is
Page 9 and 10: 12:00-12:20 The Impact of the Clima
Page 11 and 12: 13:30 - 15:50 SESSION IV: EXPERIENC
Page 13 and 14: WELCOME AND INTRODUCTIONS Water Reu
Page 15 and 16: Dr. Fouad Abousamra NOSSTIA Deputy
Page 17 and 18: KEYNOTE PRESENTATIONS Water Reuse a
Page 19 and 20: SINGAPORE’S EXPERIENCE IN ENSURIN
Page 21 and 22: Rebhi Al Sheikh Deputy Chairman - P
Page 23 and 24: Eng. Dr. Osmane AÏDI Chairman - Os
Page 27 and 28: Mahmoud Al-Sibai Syria HIGHER EDUCA
Page 29 and 30: SUSTAINABILITY OF WATER RESOURCES M
Page 31 and 32: AQUIFER STORAGE AND RECOVERY OF REC
Page 33 and 34: WATER MANAGEMENT AND WATER REUSE PR
Page 35 and 36: SESSION II: ADVANCE WATER REUSE TEC
Page 37 and 38: Abdelkader GAID Head of Department
Page 39 and 40: Water Reuse and Desalination: Exper
Page 41 and 42: ASR : A VIABLE OPTION Bassem Halabi
Page 43: Dr. Harvey Winters Professor- Fairl
Page 47 and 48: 2. Primary Scale Deposition Paralle
Page 49 and 50: Water Reuse and Desalination: Exper
Page 51 and 52: PROPER WATER TREATMENT SOLUTIONS GI
Page 53 and 54: Jean-Philippe Croue Professor in En
Page 55 and 56: emoval of high MW biopolymers occur
Page 57 and 58: SESSION III: IMPORTANCE OF PUBLIC P
Page 59 and 60: Nabil Nada Desal Engineering Manage
Page 61 and 62: Hans Meulenbroek Civil Engineer - M
Page 63 and 64: Anas Ghazi Attorney at Law, Chairma
Page 65 and 66: Ghassan Ejjeh Senior Vice President
Page 69 and 70: aimed at reducing land-based source
Page 71 and 72: SESSION IV: EXPERIENCE AND FUTURE O
Page 73 and 74: TODAY’S DESALINATION AND FUTURE D
Page 75 and 76: importance to process engineering i
Page 77 and 78: Leon Awerbuch President & Chief Tec
Page 79 and 80: HYBRID DESALINATION SYSTEMS: A SOLU
Page 81 and 82: Adding Flexibility to Combined Wate
Page 83 and 84: IMPORTANCE OF LIFE EXTENSION AND UP
Page 85 and 86: Saad Elkhadem Director of Water Div
Page 87 and 88: ARAMCO EXPERIENCE IN DESALINATION T
Page 90: © Copyright Levant Desalination As

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