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首页> 外文期刊>Journal of environmental science and health >The contribution of selected organic substrates to the anaerobic cometabolism of sulfamethazine
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The contribution of selected organic substrates to the anaerobic cometabolism of sulfamethazine

机译：所选有机底物对磺胺二甲嘧啶厌氧代谢的贡献

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摘要

Biodegradation of organic micropollutants is likely to occur due to cometabolism by particular microbial groups. In an effort to identify the stages of anaerobic digestion potentially involved in the biodegradation of the veterinary antimicrobial sulfamethazine (SMZ), the influence of selected carbon sources (sucrose, glucose, fructose, ethanol, meat extract, cellulose, soluble starch, soy oil, acetic acid, propionic acid and butyric acid) on SMZ removal by anaerobic sludge was evaluated in short-term batch experiments. Adsorption to the granular sludge constituted a significant removal mechanism, accounting for 39% of SMZ removal in control experiments. The presence of glucose, fructose, sucrose and meat extract exerted an inducing effect on SMZ degradation, resulting in removal efficiencies of 54, 53, 58 and 61%, respectively, indicating the occurrence of cometabolism. Time courses of sucrose and meat extract degradation revealed markedly distinct organic acid profiles but resulted in similar SMZ removals. Temporal profiles of acetic and propionic acid degradation were not associated with SMZ removal, as changes in SMZ concentration were observed even after the organic acids had been completely removed. The experimental results suggest that SMZ cometabolism is not associated to sucrose hydrolysis, acetoclastic methanogenesis and acetogenesis from propionic acid.
机译：有机微污染物的生物降解可能是由于特定微生物群的新陈代谢引起的。为了确定可能与兽用抗微生物药磺胺二甲胺（SMZ）生物降解有关的厌氧消化阶段，选择了碳源（蔗糖，葡萄糖，果糖，乙醇，肉提取物，纤维素，可溶性淀粉，大豆油，短期批处理实验中评估了乙酸，丙酸和丁酸对厌氧污泥去除SMZ的影响。颗粒污泥的吸附构成了重要的清除机制，在对照实验中占SMZ清除的39％。葡萄糖，果糖，蔗糖和肉提取物的存在对SMZ降解产生诱导作用，导致去除效率分别为54、53、58和61％，表明发生了新陈代谢。蔗糖和肉提取物降解的时间进程显示出明显不同的有机酸特征，但导致了相似的SMZ去除。乙酸和丙酸降解的时间变化与SMZ的去除无关，因为即使完全去除了有机酸，也观察到了SMZ浓度的变化。实验结果表明，SMZ分解代谢与蔗糖水解，破乳产甲烷作用和丙酸产乙酸作用无关。

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