College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Bioresour Technol. 2021 Jun;329:124875. doi: 10.1016/j.biortech.2021.124875. Epub 2021 Feb 23.
One of the key challenges of wastewater treatment today is to understand the potential effect of residual pollutants on the management of waste activated sludge (WAS). This study aims to clarify the effect of chlortetracycline (CTC) as a residual antibiotic on the anaerobic fermentation of WAS to produce volatile fatty acids (VFAs). The results show that CTC with a concentration of 10 mg/kg total suspended solids enhances the VFA production by 21.1%. Mechanistically, CTC was found to prompt the secretion of extracellular polymeric substances to provide more substrates for anaerobic fermentation. Meanwhile, CTC stimulates acidification by increasing the activity of acetate kinase, and inhibits methanogenesis by reducing F activity, thereby increasing the accumulation of VFAs. This article provides new insights into the behavior of CTC in WAS fermentation, which is essential for resource recovery from WAS containing CTC.
目前，污水处理面临的主要挑战之一是要了解残余污染物对废活性污泥（WAS）管理的潜在影响。本研究旨在阐明残留抗生素金霉素（CTC）对 WAS 进行厌氧发酵以生产挥发性脂肪酸（VFAs）的影响。结果表明，浓度为 10mg/kg 总悬浮固体的 CTC 可将 VFA 产量提高 21.1%。从机理上讲，发现 CTC 促使细胞外聚合物的分泌，为厌氧发酵提供更多的底物。同时，CTC 通过增加乙酰激酶的活性来促进酸化，并通过降低 F 活性来抑制甲烷生成，从而增加 VFAs 的积累。本文为 CTC 在 WAS 发酵中的行为提供了新的见解，这对于从含有 CTC 的 WAS 中进行资源回收至关重要。
