Pretreatment of seawater for biodegradable organic content removal using membrane bioreactor

Visvanathan, Chettiyappan, Boonthanon, Natapol, Sathasivan, Arumugam, and Jegatheesan, Veeriah (2002) Pretreatment of seawater for biodegradable organic content removal using membrane bioreactor. Desalination, 153 (1-3). pp. 133-140.

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Abstract

Reverse osmosis (RO) is currently one of the most prevalent methods used for seawater desalination. During the past four decades, the research anddevelopment has reduced the energy consumption from about 20 to 4 kWh/m³, while improvements in membrane science has led to a 20-fold increase in the specific membrane flux. Nevertheless, research is still underway to reduce the operation and maintenance problems and thus improve the performance of RO systems. The most important maintenance problem associated with RO operation is the membrane fouling, especially biological fouling (biofouling). This work focuses on the aspects to eliminate biofouling in RO membranes, by adopting a proper pretreatment system. The experimental results revealed that fluidized bed biological granular activated carbon, at 15 min empty bed contact time (with dissolved organic carbon, DOC concentration of 6–8 mg/L) can be utilized effectively to remove nearly 100% biodegradable DOC from seawater. Continuous experiments of membrane bioreactor (MBR) have been conducted concomitantly to gain insight into the long-term effects of MBR on biodegradable organic content removal and biofouling control. The results show that MBR system produced better effluent with 78% DOC removal and quasi-total biodegradable DOC removal. Dissolved oxygen was not a limiting factor for the DOC degradation. Short-term experimental runs were conducted with RO membrane using both pretreated and non-pretreated seawater. The results showed that filtrate from MBR yielded the highest permeate flux improvement, which was approximately 300% compared with non-pretreated seawater.

Item ID: 26894
Item Type: Article (Research - C1)
ISSN: 1873-4464
Keywords: biodegradable organic matter, biofouling, membrane bioreactor, microfiltration, pretreatment, reverse osmosis
Date Deposited: 13 May 2013 05:38
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies @ 33%
09 ENGINEERING > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified @ 33%
09 ENGINEERING > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling @ 34%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified @ 50%
96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 50%
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