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Improvement on the treatment of thick oil sewage by using integrated biochemical treatment technology

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Abstract

Sewage treatment station in oilfield needs a new process to meet the desired requirements. A new process was proposed to meet the discharge standards, which consisted of the following sub-processes: electrochemical treatment → coagulation treatment → integrated biochemical treatment of moving bed biofilm reactor and membrane bio-reactor → combined treatment process of macroporous adsorption resin. Electrochemical treatment included 5 electrolytic cells, total volume of which was 10 L. The PFS was chosen as the coagulants in the coagulation treatment, and the removal rate of COD could reach 66% when the dosage of PFS was 500 mg/L. The biochemical treatment consisted of anoxic tank, aerobic tank and membrane zone, and the removal rate of COD was about 55–70% when HRT was 12 h. SD300 resin was chosen as the best adsorbent in the treatment using macroporous adsorption resin. In addition, the effluent COD after coagulation treatment process becomes about 180 mg/L, the effluent COD after biological treatment becomes about 50 mg/L, and the last effluent COD with the macroporous adsorption resin becomes about 20 mg/L. The three-dimensional fluorescence spectrum was used to analyze the differences in types of organic matters in water samples between the raw water and the treated one. The results demonstrated that the new process meets the needs of wastewater treatment.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (NSFC) (Grant No. 51279108), the Major Project of Shanghai Municipal Science and Technology Commission (13DJ1400105) and the Major State Research Development Program of China (2016YFC0402504).

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Correspondence to H. Zhou.

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Editorial responsibility: J. Aravind.

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Zhan, Y., Wei, R. & Zhou, H. Improvement on the treatment of thick oil sewage by using integrated biochemical treatment technology. Int. J. Environ. Sci. Technol. 15, 81–92 (2018). https://doi.org/10.1007/s13762-017-1366-3

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  • DOI: https://doi.org/10.1007/s13762-017-1366-3

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