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| Comparative study on the petroleum hydrocarbon removal and ecotoxicity inhibition effects by medical stone and potassium nitrate addition in petroleum-polluted soil |
| Received:October 29, 2023 |
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| KeyWord:oil-contaminated soil;bio stimulation;ecotoxicity;medical stone;potassium nitrate |
| Author Name | Affiliation | E-mail | | YANG Zhao | 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 | | | LIU Zeliang | 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 | | | FENG 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 | | | ZHANG Xuhong | 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 Manli | 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 |
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| Abstract: |
| In order to study the bioremediation effect of medical stone and potassium nitrate on petroleum contaminated soil.This study compared the petroleum hydrocarbon removal and toxicity inhibition effects of two remediation agents in oil-polluted soil with different pollution durations. The results showed that for freshly polluted soil, the removal rates of total petroleum hydrocarbons（TPH）were 12.03% and 17.09%, respectively, after applying potassium nitrate and medical stone after 110 days of remediation. The application of potassium nitrate for remediation mainly enhanced the nitrification potential of soil microorganisms from 0 to 45 days, while the removal of TPH is mainly achieved by enhancing nitrate assimilation or dissimilation, including aerobic denitrification. For aged-polluted soil from 46 to 110 days, the removal rates of TPH were 24.41% and 22.07%, respectively, by adding potassium nitrate and medical stone to the polluted soils, and the removal of petroleum hydrocarbons mainly occurred during the period of 46-110 days. The addition of potassium nitrate increased the soil microbial nitrogen fixation and nitrification potential. Medical stone amendment mainly achieved petroleum hydrocarbon removal through adsorption. The acute toxicity test showed that the average mortality rate of earthworms was 35% in the soil treated with medical stone, which was significantly lower than that in the control experiment with a 60% mortality rate and the 100% mortality rate of earthworms in the potassium nitrate treated soil. This study demonstrated that the application of potassium nitrate significantly enhanced soil ecotoxicity, while the application of medical stone inhibited the ecotoxicity of oil-contaminated soil. Medical stone has a good effect on both inhibition of ecological toxicity and promotion of hydrocarbon removal and could be used as a high-quality remediation agent for oilcontaminated remediation. |
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