Effects of Bioavailability and Microbial Community on the Degradation of Atrazine in Sewage Sludge Biochar-Amended Soils
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...
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| Main Authors: | , , , |
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| פורמט: | Article |
| שפה: | אנגלית |
| יצא לאור: |
MDPI AG
2025-06-01
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| סדרה: | Energies |
| נושאים: | |
| גישה מקוונת: | https://www.mdpi.com/1996-1073/18/12/3158 |
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| סיכום: | 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<sub>300</sub>-SSB<sub>700</sub>) and addition rates (1% and 5%) on the atrazine biodegradation in soils. After a 21-day incubation, the application of 5% SSB<sub>300</sub> 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<sub>300</sub> groups: (1) SSB<sub>300</sub> demonstrated higher adsorption capacity for atrazine compared to SSB<sub>500</sub> and SSB<sub>700</sub> and reduced atrazine bioavailability due to its stronger hydrophobic nature and more abundant surface functional groups; and (2) the SSB<sub>300</sub> significantly decreased the abundances of dominant atrazine-degraders (<i>Arthrobacter</i> and <i>Pseudomonas</i>) and atrazine-degrading genes (<i>atz</i>A, <i>atz</i>B, and <i>trz</i>N). |
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| ISSN: | 1996-1073 |