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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Biodegradation Of Soil-applied Polycyclic Aromatic Hydrocarbons By Sulfate-reducing Bacterial Consortium
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Biodegradation Of Soil-applied Polycyclic Aromatic Hydrocarbons By Sulfate-reducing Bacterial Consortium

机译：硫酸盐还原菌群对土壤中多环芳烃的生物降解作用

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摘要

In the present study, the potential of polycyclic aromatic hydrocarbons (PAHs) biodegradation by sulfate-reducing bacterial consortium enriched from piggery wastewater was investigated. The batch experiments of soil-applied PAH biodegradation were conducted with a mixture of PAHs, i.e., naphthalene, fluorene, phenanthrene, fluoranthene and pyrene, at a concentration of 50 μg of each PAH per g of soil. A central composite design (CCD) was applied to determine the experimental conditions of each batch assay. The pH, biomass and ethanol concentrations were selected as independent variables and the PAH removal percentage was considered as a dependent variable. The optimal conditions for PAH biodegradation were found to be a pH between 4 and 6.5, an ethanol concentration less than 35 mg/L and a biomass concentration greater than 65 mg/L. Bench scale experiments were carried out at the optimal conditions. At the end of experiment (27 d), total PAH removals by biodegradation and volatilization were around 74% and 20%, respectively. The order of PAH removal was naphthalene, phenanthrene, fluorene, fluoranthene, and pyrene. Throughout the study, PAH biodegradation was in good correlation with sulfate reduction. Results of the kinetics study indicated a competitive inhibition between PAHs investigated.
机译：在本研究中，研究了从猪场废水中富集的硫酸盐还原细菌财团对多环芳烃（PAHs）的生物降解潜力。使用PAH的混合物（即萘，芴，菲，荧蒽和pyr）的混合物进行土壤应用的PAH生物降解的分批实验，每种PAH的浓度为每克土壤50μg。应用中央复合设计（CCD）确定每个批次测定的实验条件。选择pH，生物量和乙醇浓度作为自变量，将PAH去除百分比视为因变量。发现用于PAH生物降解的最佳条件是pH在4至6.5之间，乙醇浓度小于35mg / L和生物质浓度大于65mg / L。在最佳条件下进行基准规模的实验。在实验结束时（27天），通过生物降解和挥发去除的PAH总量分别约为74％和20％。 PAH的去除顺序为萘，菲，芴，荧蒽和pyr。在整个研究过程中，PAH的生物降解与硫酸盐还原具有良好的相关性。动力学研究结果表明所研究的PAH之间存在竞争性抑制作用。

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