Title

Combined hydrolysis acidification and bio-contact oxidation system with air-lift tubes and activated carbon bioreactor for oilfield wastewater treatment

RIS ID

92393

Publication Details

Guo, C., Chen, Y., Chen, J., Wang, X., Zhang, G., Wang, J., Cui, W. & Zhang, Z. (2014). Combined hydrolysis acidification and bio-contact oxidation system with air-lift tubes and activated carbon bioreactor for oilfield wastewater treatment. Bioresource Technology, 169 630-636.

Abstract

This paper investigated the enhancement of the COD reduction of an oilfield wastewater treatment process by installing air-lift tubes and adding an activated carbon bioreactor (ACB) to form a combined hydrolysis acidification and bio-contact oxidation system with air-lift tubes (HA/air-lift BCO) and an ACB. Three heat-resistant bacterial strains were cultivated and subsequently applied in above pilot plant test. Installing air-lift tubes in aerobic tanks reduced the necessary air to water ratio from 20 to 5. Continuous operation of the HA/air-lift BCO system for 2 months with a hydraulic retention time of 36 h, a volumetric load of 0.14 kg COD/(m3 d) (hydrolysis-acidification or anaerobic tank), and 0.06 kg COD/(m3 d) (aerobic tanks) achieved an average reduction of COD by 60%, oil and grease by 62%, total suspended solids by 75%, and sulfides by 77%. With a COD load of 0.56 kg/(m3 d), the average COD in the ACB effluent was 58 mg/L.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.biortech.2014.07.018