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Analysis of the Degradation of OCPs Contaminated Soil by the BC/nZVI Combined with Indigenous Microorganisms

Author

Listed:
  • Qun Li

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China
    These authors contributed equally to this work.)

  • Lei Zhang

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China
    These authors contributed equally to this work.)

  • Jinzhong Wan

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Tingting Fan

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Shaopo Deng

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Yan Zhou

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Yue He

    (Ministry of Ecology and Environment Peoples Republic of China, Nanjing Institute of Environmental Science, No. 8, Jiangwang Miao Street, Nanjing 210042, China)

Abstract

Organochlorine pesticides (OCPs) were typical persistent organic pollutants that posed great hazards and high risks in soil. In this study, a peanut shell biochar-loaded nano zero-valent iron (BC/nZVI) material was prepared in combination with soil indigenous microorganisms to enhance the degradation of α-hexachlorocyclohexane(α-HCH) and γ-hexachlorocyclohexane(γ-HCH) in water and soil. The effects of BC/nZVI on indigenous microorganisms in soil were investigated based on the changes in redox potential and dehydrogenase activity in the soil. The results showed as follows: (1) The specific surface area of peanut shell biochar loaded with nano-zero-valent iron was large, and the nano-zero-valent iron particles were evenly distributed on the peanut shell biochar; (2) peanut shell BC/nZVI had a good degradation effect on α-HCH and γ-HCH in water, with degradation rates of 64.18% for α-HCH and 91.87% for γ-HCH in 24 h; (3) peanut shell BC/nZVI also had a good degradation effect on α-HCH and γ-HCH in soil, and the degradation rates of α-HCH and γ-HCH in the 1% BC/nZVI reached 55.2% and 85.4%, second only to 1% zero-valent iron. The degradation rate was the fastest from 0 to 7 days, while the soil oxidation-reduction potential (ORP) increased sharply. (4) The addition of BC/nZVI to the soil resulted in a significant increase in dehydrogenase activity, which further promoted the degradation of HCHs; the amount of HCHs degradation was significantly negatively correlated with dehydrogenase activity. This study provides a remediation strategy for HCH-contaminated sites, reducing the human health risk of HCHs in the soil while helping to improve the soil and increase the activity of soil microorganisms.

Suggested Citation

  • Qun Li & Lei Zhang & Jinzhong Wan & Tingting Fan & Shaopo Deng & Yan Zhou & Yue He, 2023. "Analysis of the Degradation of OCPs Contaminated Soil by the BC/nZVI Combined with Indigenous Microorganisms," IJERPH, MDPI, vol. 20(5), pages 1-11, February.
  • Handle: RePEc:gam:jijerp:v:20:y:2023:i:5:p:4314-:d:1083302
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    References listed on IDEAS

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    1. Siyu Yao & Jiahui Huang & Haijun Zhou & Cuiting Cao & Tao Ai & Huanhuan Xing & Jianteng Sun, 2022. "Levels, Distribution and Health Risk Assessment of Organochlorine Pesticides in Agricultural Soils from the Pearl River Delta of China," IJERPH, MDPI, vol. 19(20), pages 1-13, October.
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