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<p>This study aimed to assess the efficiency of antibiotic biodegradation followed by compost sterilization prior to amendment of agricultural soils using contaminated sludge. Thus, biodegradation of the antibiotics amoxicillin (AMO), ciprofloxacin (CIP) and metronidazole (MET) in a co-composting system was studied. Experiments were carried out in 10 L trials using crushed household waste (potato skins, carrots, lettuce, broccoli) mixed with sewage sludge and pine wood shavings as bulking material. Based on the antibiotic concentrations observed, 99.5% of AMO was biodegraded after 15&#xa0;days, 98.7% of CIP after 60&#xa0;days and 99.6% of MET after 30&#xa0;days, while complete mineralization of the 3 antibiotics was achieved after 90&#xa0;days of composting process. Determination of the ratio between the variations in the concentration of antibiotics and BOD values (i.e., Δ[ANT] ÷ Δ[BOD]) for the same co-composting period is an interesting way to monitor the antibiotic biodegradation progress according to the variation in BOD. The composts were sterilized by autoclaving to avoid the dissemination of multi-resistant bacteria generated in the co-composting system. Phytotoxicity tests at the end of composting period (i.e., 90&#xa0;days) showed that generated composts were no toxic to the plant species <i>Sorghum saccharatum</i> and <i>Lepidium sativum</i>.</p> Graphical Abstract <p></p>

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Antibiotic Contaminated Sludge Biodegradation by Co-composting Processes: Using Microbiological and Phytotoxicity Tests to Assess Process Efficiency

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Maíne Alves-Pereira,
  • Renan C. Testolin,
  • Gabriel Poyer-Radetski,
  • Cleder A. Somensi,
  • Edésio L. Simionatto,
  • Adriana H. R. Santos,
  • Aline Dal Conti-Lampert,
  • Rafael Ariente-Neto,
  • Claudemir M. Radetski,
  • Sylvie Cotelle

摘要

This study aimed to assess the efficiency of antibiotic biodegradation followed by compost sterilization prior to amendment of agricultural soils using contaminated sludge. Thus, biodegradation of the antibiotics amoxicillin (AMO), ciprofloxacin (CIP) and metronidazole (MET) in a co-composting system was studied. Experiments were carried out in 10 L trials using crushed household waste (potato skins, carrots, lettuce, broccoli) mixed with sewage sludge and pine wood shavings as bulking material. Based on the antibiotic concentrations observed, 99.5% of AMO was biodegraded after 15 days, 98.7% of CIP after 60 days and 99.6% of MET after 30 days, while complete mineralization of the 3 antibiotics was achieved after 90 days of composting process. Determination of the ratio between the variations in the concentration of antibiotics and BOD values (i.e., Δ[ANT] ÷ Δ[BOD]) for the same co-composting period is an interesting way to monitor the antibiotic biodegradation progress according to the variation in BOD. The composts were sterilized by autoclaving to avoid the dissemination of multi-resistant bacteria generated in the co-composting system. Phytotoxicity tests at the end of composting period (i.e., 90 days) showed that generated composts were no toxic to the plant species Sorghum saccharatum and Lepidium sativum.

Graphical Abstract