RESEARCH PROGRESS ON IMPACT AND REGULATION STRATEGIES OF TYPICAL ANTIBIOTICS ON ANAEROBIC DIGESTION EFFICIENCY OF SLUDGE: A REVIEW
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摘要: 厌氧消化是实现污泥等废弃物资源化利用和无害化处理的有效手段。近年来,抗生素被广泛滥用,并不可避免地对污泥厌氧消化体系产生潜在影响。综合探讨了不同抗生素在不同环境条件下(温度、浓度、底物、暴露方式、复合存在等)对污泥厌氧消化效能的影响。结果表明,不同抗生素对污泥厌氧消化的影响可归结为抑制、促进和无影响等,其中抑制作用更为普遍。进一步分析发现,抗生素主要通过破坏功能菌群结构、改变代谢途径(如酶活性、胞外聚合物分泌)、影响群体感应机制等方式影响系统效能。然而,通过采用物理处理(如水热、超声等)、化学处理(如高级氧化技术、臭氧、电化学等)、生物处理(如外源添加生物酶、外源添加材料加速电子传递等)、联合处理(碱热、超声/臭氧等)等预处理手段可有效削减系统中抗生素的不利影响,提升厌氧消化效能。最后,从预处理手段的优化、抗生素迁移对生态系统潜在影响等角度进行了展望,可为提升厌氧消化效能提供参考。Abstract: Anaerobic digestion is one of the most effective and eco-friendly technologies for resource utilization and harmless disposal of organic wastes. In recent years, antibiotics have been widely misused and enriched into sludge, which inevitably has a potential impact on the anaerobic digestion system of sludge. This study comprehensively investigated the effects of different antibiotics on the efficacy of anaerobic digestion of sludge under various environmental conditions (temperature, concentration, substrate, exposure mode, coexistence, etc.). The results showed that antibiotics were generally inhibitory and a few tended to promote and restore. The reason for this discrepancy could be attributed to the variability in the effects of antibiotics on cell structure disruption (e.g., cell wall structure), metabolic pathways (e.g., enzyme activity, extracellular polymer secretion), and adaptive mechanisms (quorum sensing systems). However, the adverse effects of antibiotics in the system could be effectively reduced, and anaerobic digestion efficacy could be enhanced by adopting physical (such as hydrothermal, ultrasound, etc.), chemical (such as advanced oxidation technologies, ozone, electrochemistry, etc.), biological (such as the addition of exogenous bioenzymes, materials to accelerate electron transfer, etc.), and combined (such as alkali heat, ultrasound-ozone, etc.) pretreatment methods. Finally, prospects for the optimization of pretreatment methods and the potential impacts of antibiotic migration on ecosystems were discussed, which could provide references for enhancing the efficacy of anaerobic digestion.
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Key words:
- sludge /
- anaerobic digestion /
- antibiotics /
- metabolic pathway /
- reduction strategy
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