alexa Prepared bed bioremediation of oily sludge in an oilfield in northern China.
Chemical Engineering

Chemical Engineering

Journal of Advanced Chemical Engineering

Author(s): Liu W, Luo Y, Teng Y, Li Z, Christie P

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Abstract Field-scale bioremediation of oily sludge in prepared beds was studied at Shengli oilfield in northern China. The influence of manure, coarse sand, sawdust, a specialized microbial preparation and greenhouse conditions on the efficiency of removal of oil and grease was evaluated. After bioremediation for 230d, oil and grease content fell by 32-42gkg(-1)dry sludge in treated plots, indicating removal of 27-46\% compared with only 15\% in the control plot. Addition of manure, coarse sand, sawdust and greenhouse conditions significantly (p<0.05) increased the amount removed. Moreover, the physico-chemical properties of the sludge in all treated plots improved significantly after bioremediation. Microbial biomass in sludge and community-level physiological profiling examined using BIOLOG microplates was also studied. Total petroleum hydrocarbon degraders and polycyclic aromatic hydrocarbon degraders increased in all treated oily sludge. The activity of sludge microbial communities increased markedly in the treated plots compared with the control. Canonical correspondence analysis showed that differences in substrate utilization patterns were highly correlated (p<0.05) with sludge hydrolyzable N and oil and grease content. The biological toxicity of the oily sludge was lower following bioremediation in most of the treated plots as evaluated using Photobacterium phosphoreum T3. This article was published in J Hazard Mater and referenced in Journal of Advanced Chemical Engineering

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