Biological treatment of oily wastewater from gas stations by membrane bioreactor

Tri, P.T., Visvanathan, C., and Jegatheesan, V. (2006) Biological treatment of oily wastewater from gas stations by membrane bioreactor. Journal of Environmental Engineering and Science, 5 (4). pp. 309-316.

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n many Asian countries, rapid industrialization and urbanization has led to an increased number of cars, making wastewater from gas stations an important issue of concern in urban environment. This wastewater is characterized by high concentration of oil-water emulsion, which cannot be effectively removed by a conventional gravity separator. An experimental investigation on the treatability of oily wastewater from gas stations using a membrane bioreactor (MBR) system revealed that MBR system could achieve good removal efficiency with stability against shock loading. Optimum operating conditions were found to be at a hydraulic retention time of 4 h and an oil-loading rate of 1.8 kg oil m^sup -3^.d^sup -1^. It was anticipated that adding powdered activated carbon (PAC) in the MBR could help to adsorb the oils. However, operating the MBR with only microbial flocs has an advantage over adding PAC particles into the MBR, since the former condition could provide a prolonged cycle of filtration with a relatively lesser increase in transmembrane pressure.

Item ID: 4089
Item Type: Article (Research - C1)
ISSN: 1496-2551
Keywords: activated sludge process; membrane bioreactor; membrane fouling; oily wastewater; powdered activated carbon; transmembrane pressure
Date Deposited: 01 Oct 2009 04:34
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies @ 100%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified @ 100%
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