Abstract The acclimation process of activated sludge from a wastewater treatment plant for degradation of glyphosate and its biodegradation kinetics were studied in a batch reactor. The parameters monitored included the concentrations of glyphosate, as well as aminomethylphosphonic acid (AMPA), its main metabolite, total organic carbon (TOC), pH, dissolved oxygen (DO) and biomass concentration. At the end of the acclimation process, glyphosate removal efficiency of the acclimated sludge was compared to the fresh sludge one. The results showed that the acclimation process highly increased degradation efficiency. Complete glyphosate removal has been achieved during kinetics experiments. Glyphosate removal kinetic of the acclimated sludge was modeled by Monod model that accurately fitted the experimental results with a maximum growth rate (μmax) of 0.34 h−1 and half-saturation constant (Ks) of 1600 mg L−1. Finally, a biodegradation pathway of glyphosate used as carbon source was proposed.

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驯化活性污泥对草甘膦的生物降解能力：实验研究和动力学模型

摘要 在间歇反应器中研究了废水处理厂活性污泥降解草甘膦的驯化过程及其生物降解动力学。监测的参数包括草甘膦的浓度，以及氨甲基膦酸 (AMPA)、其主要代谢物、总有机碳 (TOC)、pH、溶解氧 (DO) 和生物量浓度。在驯化过程结束时，将驯化后的污泥与新鲜污泥的草甘膦去除效率进行比较。结果表明，驯化过程大大提高了降解效率。在动力学实验中已经实现了完全的草甘膦去除。驯化污泥的草甘膦去除动力学由 Monod 模型模拟，该模型以 0 的最大增长率 (μmax) 准确拟合实验结果。34 h-1 和 1600 mg L-1 的半饱和常数 (Ks)。最后，提出了草甘膦作为碳源的生物降解途径。