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Effects of Bioavailability and Microbial Community on the Degradation of Atrazine in Sewage Sludge Biochar-Amended Soils

Author

Listed:
  • Siying Li

    (National Engineering Research Center for Safe Disposal and Resources Recovery of Sludge, Harbin 150090, China
    School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Xin Li

    (National Engineering Research Center for Safe Disposal and Resources Recovery of Sludge, Harbin 150090, China
    School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Yunyang Li

    (National Engineering Research Center for Safe Disposal and Resources Recovery of Sludge, Harbin 150090, China)

  • Yue Zhao

    (National Engineering Research Center for Safe Disposal and Resources Recovery of Sludge, Harbin 150090, China
    School of Environment, Harbin Institute of Technology, Harbin 150090, China)

Abstract

Biochar, as an emerging biotechnology, has been widely used in the remediation of soil organic pollution, mainly by promoting the abundance of related degrading bacteria in soil. In this study, we explored the influence of sewage sludge biochars pyrolyzed at different temperatures of 300–700 °C (SSB 300 -SSB 700 ) and addition rates (1% and 5%) on the atrazine biodegradation in soils. After a 21-day incubation, the application of 5% SSB 300 significantly increased soil catalase (CAT), urease activity, dissolved organic carbon (DOC), and electrical conductivity (EC). However, biochar amendment exhibited inhibitory effects on atrazine degradation in soils. The atrazine degradation ratio decreased with decreasing pyrolysis temperature and increasing addition rates. Further analysis found that there were two possible reasons for the significant decline of atrazine biodegradation in SSB 300 groups: (1) SSB 300 demonstrated higher adsorption capacity for atrazine compared to SSB 500 and SSB 700 and reduced atrazine bioavailability due to its stronger hydrophobic nature and more abundant surface functional groups; and (2) the SSB 300 significantly decreased the abundances of dominant atrazine-degraders ( Arthrobacter and Pseudomonas ) and atrazine-degrading genes ( atz A, atz B, and trz N).

Suggested Citation

  • Siying Li & Xin Li & Yunyang Li & Yue Zhao, 2025. "Effects of Bioavailability and Microbial Community on the Degradation of Atrazine in Sewage Sludge Biochar-Amended Soils," Energies, MDPI, vol. 18(12), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:12:p:3158-:d:1680075
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