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| Degradation of petroleum hydrocarbons during the bioremediation of cultivated loessial soil |
| Received:November 08, 2017 |
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| KeyWord:petroleum contaminated cultivated loessial soil;bioaugmentation;biostimulation;ammonium nitrogen;hydrogen-degrading population;limiting factor |
| Author Name | Affiliation | | WU Man-li | School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China | | ZHANG Chen | School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China | | QI Yan-yun | School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China | | YE Xi-qiong | School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China | | ZHU Chang-cheng | School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China |
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| Abstract: |
| A microcosm study was conducted to assess the effects of bioremediation and limiting factors on petroleum hydrocarbon degradation during the remediation of oil-contaminated soil. The contents of petroleum hydrocarbons, nitrogen(total N, nitrate N, and ammonium N), available phosphorus, and hydrocarbon-degrading microorganisms were measured during bioremediation. The correlations between petroleum hydrocarbon degradation and influential factors were analyzed using SPSS 19.0. Biostimulation was more effective than bioaugmentation in removing petroleum hydrocarbons from the cultivated loessial soil and degraded 14.54%, 21.98%, and 33.14% of the total petroleum hydrocarbons(TPH), alkanes, and polycyclic aromatic hydrocarbons(PAHs) respectively within five weeks. The ammonium N content of the soil decreased from 210.4 mg·kg-1 to 97.2 mg·kg-1, and the nitrate N was unaffected. The populations of TPH-, alkane-, PAH-degraders reached 1.60×105, 3.09×105, and 7.08×103 CFU g-1 soil, respectively, in the biostimulation treatment, which was greater than those in the control treatment. Correlation analysis indicated that bioremediation was limited by the contents of available phosphorus and ammonium N, which were related to TPH and alkane degradation. |
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