In this study, real petrochemical wastewater treatment was investigated at four hydraulic retention times (HRTs) of 30, 18, 12 and 6 h, using membrane bioreactor. Initial evaluation confirmed the presence of styrene and more than 30 different types of compounds in petrochemical wastewater. Laboratory tests and gas chromatography–mass spectrometry (GC–MS) studies indicated that at all HRTs, styrene and chemical oxygen demand (COD) removal efficiencies are higher than 99 and 95%, respectively. Further investigations also revealed that HRT decreasing, not only does not reduce the COD removal efficiency, but also improves the eu ffl ent COD by increasing mixed liquor suspended solids. Also GC–MS analysis indicated that styrene as the major pollutant was removed over 99%. Transmembrane pressure was monitored for determining membrane fouling. Data showed severe membrane fouling occurred at HRT of 6 h which was attributed to increase in soluble microbial products. Keywords Biological treatment · MBR · Styrene removal · Real petrochemical wastewater Introduction p-xylene, butadiene styrene rubber (BDSR), MTBE. BDSR unit alone produces 40,000 tons of styrene rubber annually. Styrene is one of the most important components of the Styrene consumption of this unit is about 7800 tons per year. aromatic compounds used in various petrochemical prod- As a result, styrene
International Journal of Environmental Science and Technology – Springer Journals
Published: May 31, 2018
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