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| Biological removal efficiency and influencing factors of petroleum hydrocarbons in soil with different polluted time |
| Received:November 01, 2020 |
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| KeyWord:biostimulation;stimulating agents;petroleum hydrocarbon;soil;pollution time |
| Author Name | Affiliation | E-mail | | HOU Shuang-shuang | Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, School of Environmental and Municipal Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China | | | WU Man-li | Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, School of Environmental and Municipal Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China | 447005853@qq.com | | XIAO He-yue | Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, School of Environmental and Municipal Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China | | | DUAN Xu-hong | Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, School of Environmental and Municipal Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China | | | YI Ning | Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, School of Environmental and Municipal Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China | |
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| Abstract: |
| Petroleum hydrocarbon removal efficiencies in freshly/aged contaminated loessal soil were analyzed by adding organic fertilizer, organic fertilizer plus KNO3(C:N=100:10), and desulfurized gypsum as biostimulant agents. Results showed that after 150 days of remediation, petroleum hydrocarbon removal efficiencies were 60.13% and 56.09% in the freshly contaminated soils treated with organic fertilizer and organic fertilizer plus KNO3, respectively, which were higher than that of treated with desulfurized gypsum. In the aged contaminated soil, the hydrocarbon removal efficiencies were 36.62% and 36.61% in the soils treated with organic fertilizer plus KNO3 and desulfurized gypsum, respectively. The petroleum removal efficiencies were higher in the freshly contaminated soil than those in the aged contaminated soil. In both the freshly and aged contaminated soil, the petroleum hydrocarbon biodegradation efficiencies conformed to pseudo first-order kinetics. Soil pH decreased from 8.50~8.56 to 7.35~7.91 owing to bioremediation. In the freshly contaminated soil, hydrocarbon biodegradation efficiency positively correlated with the number of soil microorganisms with the correlation coefficient of 0.849; however, the hydrocarbon biodegradation efficiency negatively correlated with pH with the correlation coefficient of -0.789. In the aged contaminated soil, the hydrocarbon biodegradation efficiency negatively correlated with pH, and the correlation coefficient was -0.683. These results indicate that biostimulation remediation is more effective for hydrocarbon removal in the freshly contaminated loessal soil than that in the aged contaminated soil. The key factors affecting petroleum hydrocarbon biodegradation in soils with different pollution time frames are different. |
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