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| Remediation of Oil-containing Wastewater Contaminated Soil Using Microbial Agent |
| Received:September 18, 2014 |
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| KeyWord:oil-containing wastewater contaminated soil;solid microbial agent;bioremediation |
| Author Name | Affiliation | E-mail | | WANG Tie-yuan | School of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | DOU Sen | School of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China | dousen@tom.com | | HU Yong-zhe | School of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | WANG Cheng-yu | School of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | LIU Lu-jun | Jilin Oilfield Company Fuyu Production Plant, Songyuan 138000, China | | | LIN Chen-ming | School of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China | |
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| Abstract: |
| Soil contamination by oil-containing wastewater becomes an environmental issue in oilfields, which profoundly affects crop growth. In this study, one bacterium strain(H6) producing surfactants and 6 dominant bacterium strains(H-1, H-17, H-18, H-19, H-20, H-23) were screened from oil-degrading bacteria strains. Then the bacterial combinations of H-6 with any three dominant strains were assessed for their oil-degrading efficiency. A high efficient oil-degrading bacterium group C5(H-1, H-6, H-18, H-19) was obtained. A solid microbial agent(MA) was produced by inoculating the bacterium group C5 on straw. Bioremediation of oil contaminated soil by MA was examined in both indoor simulation experiment and field trial by determining oil content, salt index and microbiological properties. In both experiments, applying MA significantly enhanced oil degradation, compared to the control. The bacteria in MA showed halophilic characteristics. Significantly lower pH, electrical conductivity, salt content, sodium adsorption ratio(SAR) and total alkalinity(TA) were observed in soils with MA than in the control. Applying MA microbial agent also improved microbial population, microbial biomass carbon and soluble salt ion composition. These results show that the solid MA may be applied to remediate oil-contaminated soils on large scale. |
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