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Treatment of the refinery wastewater in a gas–liquid–solid three-phase flow airlift loop bioreactor

✍ Scribed by Wen Jianping; Yuan Qing; Pan Lei; Mao Guozhu

Publisher
Wiley (John Wiley & Sons)
Year
2005
Tongue
English
Weight
118 KB
Volume
80
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

Aerobic treatment of refinery wastewater was carried out in a 200 dm^3^ gas–liquid–solid three‐phase flow airlift loop bioreactor, in which a biological membrane replaced the activated sludge. The influences of temperature, pH, gas–liquid ratio and hydraulic residence time on the reductions in chemical oxygen demand (COD) and NH~4~‐N were investigated and discussed. The optimum operation conditions were obtained as temperature of 25–35 °C, pH value of 7.0–8.0, gas–liquid ratio of 50 and hydraulic residence time of 4 h. The radial and axial positions had little influence on the local profiles of COD and NH~4~‐N. Under the optimum operating conditions, the effluent COD and NH~4~‐N were less than 100 mg dm^−3^ and 15 mg dm^−3^ respectively for more than 40 days, satisfying the national primary discharge standard of China (GB 8978‐1996). Copyright © 2005 Society of Chemical Industry

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