Biotreatment of oily wastewater by rhamnolipids in aerated active sludge system |
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| Authors: | Hong-zi Zhang Xu-wei Long Ru-yi Sha Guo-liang Zhang Qin Meng |
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| Institution: | (1) Department of Environmental Sciences, PMAS Arid Agriculture University, Rawalpindi, Pakistan;(2) Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, 38040, Pakistan;(3) Department of Environmental Sciences, University of California, Riverside, CA 92521, USA; |
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| Abstract: | Oily wastewater generated by various industries creates a major ecological problem throughout the world. The tra-ditional methods for the oily wastewater treatment are inefficient and costly. Surfactants can promote the biodegradation of pe-troleum hydrocarbons by dispersing oil into aqueous environment. In the present study, we applied rhamnolipid-containing cell-free culture broth to enhance the biodegradation of crude oil and lubricating oil in a conventional aerobically-activated sludge system. At 20 ℃, rhamnolipids (11.2 mg/L) increased the removal efficiency of crude oil from 17.7% (in the absence of rham-nolipids) to 63%. At 25 ℃, the removal efficiency of crude oil was over 80% with the presence of rhamnolipids compared with 22.3% in the absence of rhamnolipids. Similarly, rhamnolipid treatment (22.5 mg/L) for 24 h at 20 ℃ significantly increased the removal rate of lubricating oil to 92% compared with 24% in the absence of rhamnolipids. The enhanced removal of hydrocarbons was mainly attributed to the improved solubility and the reduced interracial tension by rhamnolipids. We conclude that a direct application of the crude rhamnolipid solution from cell culture is effective and economic in removing oily contaminants from wastewater. |
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| Keywords: | Oily wastewater Rhamnolipid Aerated active sludge system Biodegradation |
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