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, vol. 5, no. 4, pp. 309-316, doi: 10.1139/s05-032.

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Title Biological treatment of oily wastewater from gas stations by membrane bioreactor
Author(s) Tri, P. T.
Visvanathan, C.
Jegatheesan, V.
Journal name Journal of environmental engineering and science
Volume number 5
Issue number 4
Start page 309
End page 316
Publisher N R C Research Press
Place of publication Ottawa, Canada
Publication date 2006-07
ISSN 1496-2551
Keyword(s) activated sludge process
membrane bioreactor
membrane fouling
oily wastewater
powdered activated carbon
transmembrane pressure
Summary In 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.
Language eng
DOI 10.1139/s05-032
Field of Research 090599 Civil Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, National Research Council of Canada
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