化学
微塑料
发酵
活性污泥
食品科学
毒性
有机质
环境化学
废水
废物管理
有机化学
工程类
作者
Xiaoying Zheng,Linghua Zhu,Zhi Xu,Misuk Yang,Xiaoyao Shao,Shan-Shan Yang,Huijie Zhang,Fan Wu,Zongshuo Han
标识
DOI:10.1016/j.scitotenv.2021.149394
摘要
Anaerobic fermentation is crucial to resource utilization of waste activated sludge (WAS). However, accumulated microplastics (MPs) in sludge could not be ignored. Here, a typical MP, polystyrene (PS), was selected to study the effects of different concentrations of PS on anaerobic fermentation under the optimal volatile fatty acids (VFAs) production. Compared to the control, low PS concentrations (30 particles/g total solid) significantly (p = 0.002) increased the production of VFAs to 112.8 ± 2.4% due to solubilization enhancement and enzymatic activity. High concentrations of PS (90 particles/g total solid) significantly (p = 0.000) decreased VFAs production to 83.01 ± 0.76% because of the inactive related microbial activities, although organic matter release was enhanced in the initial stage. Mechanism studies showed that the toxicity of high PS concentration could be attributed to reactive oxygen species (ROS) production, excess sodium dodecyl sulfate (SDS), and synergistic toxicity of aged MPs with external pollutants.
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