Microbial Remediation and Optimization of Oil Polluted Wetlands at Dalian Bay in China

LEI-CHANG HUANG; SHU-HONG YE; YU ZHANG; YAO OLIVE LI; XIANG-RONG WANG; DEWEN DING

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Volume 20 Issue 5

Oct. 2007

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Article Navigation > Biomedical and Environmental Sciences > 2007 > 20(5): 414-419

LEI-CHANG HUANG, SHU-HONG YE, YU ZHANG, YAO OLIVE LI, XIANG-RONG WANG, DEWEN DING. Microbial Remediation and Optimization of Oil Polluted Wetlands at Dalian Bay in China[J]. Biomedical and Environmental Sciences, 2007, 20(5): 414-419.

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LEI-CHANG HUANG, SHU-HONG YE, YU ZHANG, YAO OLIVE LI, XIANG-RONG WANG, DEWEN DING. Microbial Remediation and Optimization of Oil Polluted Wetlands at Dalian Bay in China[J]. Biomedical and Environmental Sciences, 2007, 20(5): 414-419.

Microbial Remediation and Optimization of Oil Polluted Wetlands at Dalian Bay in China

Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;Artand Design School of Dalian Polytechnic University, Datian 116034, Liaoning, China
Biology and Food Engineering School of Dalian Polytechnic University, Dalian 116034, Liaoning, China;College of Marine Environment and Security Engineering, Shanghai Maritime University, Shanghai 200135, China
Biology and Food Engineering School of Dalian Polytechnic University, Dalian 116034, Liaoning, China
Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada MsS3E5
Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
College of Marine Environment and Security Engineering, Shanghai Maritime University, Shanghai 200135, China

Funds: 国家高技术研究发展计划(863计划)(2002AA648010)

Abstract

The wetland at Dalian Bay in the Northeast of China has been polluted by oil severely. The effect of various microbes and operation parameters on the bioremediation of oil-polluted wetlands at Dalian Bay was investigated and reported previously. In the study,other operation conditions related to the status of medium were investigated via statistical experimental design and analysis and a necessary information is involved to use micro-technology in the application.Methods The method used involved the direct inoculation of selected bacteria,which were capable of degrading oil. The operation conditions were further optimized and evaluated by gravimetrical assay.Results The optimal pH and temperature for the studied bacteria to degrade the existing oil pollutants were established as pH 8.0 and 27℃. The mixed of various bacteria showed better results in terms of oil degradation than any single one. Among the selected four factors,disturbance,oxidant,nutrients,and biosurfactant,the former two contributed more impacts on the oil degradation in the early stage of process,while the latter two became the limiting factors in the late stage. Three sets of optimal conditions were obtained for each individual stage,but no one was suitable for the overall process.Conclusion The study demonstrated the technical feasibility of using direct inoculation into the contaminated soil samples to remove oil pollutants. It suggested that the operation conditions should be monitored and adjusted during the different stages of bio-reactions in the process to achieve the best result of oil degradation.
- Biodegradation,
- Micro-bioremediation,
- Oil pollution
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Microbial Remediation and Optimization of Oil Polluted Wetlands at Dalian Bay in China

Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;Artand Design School of Dalian Polytechnic University, Datian 116034, Liaoning, China

Biology and Food Engineering School of Dalian Polytechnic University, Dalian 116034, Liaoning, China;College of Marine Environment and Security Engineering, Shanghai Maritime University, Shanghai 200135, China

Biology and Food Engineering School of Dalian Polytechnic University, Dalian 116034, Liaoning, China

Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada MsS3E5

Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China

College of Marine Environment and Security Engineering, Shanghai Maritime University, Shanghai 200135, China

Funds: 国家高技术研究发展计划(863计划)(2002AA648010)

Key words:

Abstract: The wetland at Dalian Bay in the Northeast of China has been polluted by oil severely. The effect of various microbes and operation parameters on the bioremediation of oil-polluted wetlands at Dalian Bay was investigated and reported previously. In the study,other operation conditions related to the status of medium were investigated via statistical experimental design and analysis and a necessary information is involved to use micro-technology in the application.Methods The method used involved the direct inoculation of selected bacteria,which were capable of degrading oil. The operation conditions were further optimized and evaluated by gravimetrical assay.Results The optimal pH and temperature for the studied bacteria to degrade the existing oil pollutants were established as pH 8.0 and 27℃. The mixed of various bacteria showed better results in terms of oil degradation than any single one. Among the selected four factors,disturbance,oxidant,nutrients,and biosurfactant,the former two contributed more impacts on the oil degradation in the early stage of process,while the latter two became the limiting factors in the late stage. Three sets of optimal conditions were obtained for each individual stage,but no one was suitable for the overall process.Conclusion The study demonstrated the technical feasibility of using direct inoculation into the contaminated soil samples to remove oil pollutants. It suggested that the operation conditions should be monitored and adjusted during the different stages of bio-reactions in the process to achieve the best result of oil degradation.

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