Influence of sulfadiazine on anaerobic fermentation of waste activated sludge for volatile fatty acids production: Focusing on microbial responses
Influence of sulfadiazine on anaerobic fermentation of waste activated sludge for volatile fatty acids production: Focusing on microbial responses
复制标题
磺胺嘧啶对废弃活性污泥厌氧发酵生产挥发性脂肪酸的影响：关注微生物反应
DOI：
10.1016/j.chemosphere.2018.12.015
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Zhou Qi
中科院分区：
文献类型：
--
作者：
Xie Jing;Duan Xu;Feng Leiyu;Yan Yuanyuan;Wang Feng;Dong Haiqing;Jia Renyong;Zhou Qi
目前，对污泥厌氧发酵生产挥发性脂肪酸（VFAs）的研究主要集中在操作参数和预处理方法的影响，而对污泥吸附的有机污染物的研究较少。研究了废水中典型抗生素污染物磺胺嘧啶（SDZ）对厌氧发酵过程中VFAs产生的影响。SDZ的存在显著影响VFA的积累。当SDZ添加量为50 mg/kg干污泥时，污泥中VFAs浓度为2032.8 mg COD/L，明显高于对照组（1540.2 mg COD/L）。机理研究表明，SDZ的存在增加了污泥中胞外聚合物（EPS）的含量，提供了更多的底物，蛋白质和碳水化合物，并为厌氧菌创造了有利的环境。SDZ能促进WAS的水解和酸化，功能微生物有利于VFAs的产生。SDZ的产生促进了蛋白酶、α-葡萄糖苷酶和乙酸激酶的活性，有利于水解酸化。SDZ对纯菌株的作用进一步证实了SDZ对厌氧发酵过程中VFAs的形成有促进作用。
Extensive studies on anaerobic fermentation of waste activated sludge (WAS) for volatile fatty acids (VFAs) production focused on the effects of operating parameters and pretreatment methods, and little information is available for those of organic pollutants which were absorbed on sludge. The influence of sulfadiazine (SDZ), a typical antibiotic pollutant in WAS, on VFAs production during anaerobic fermentation was investigated in this study. The accumulation of VFAs was remarkably affected in the presence of SDZ. When the content of SDZ was 50 mg per kilogram dry sludge the concentration of VFAs from sludge was 2032.8 mg COD/L, much higher than that of control (1540.2 mg COD/L). Mechanism investigation revealed that the content of extracellular polymeric substances (EPS) from sludge was increased due to the presence of SDZ, which provided more substrates,i.e., protein and carbohydrate, and created a favorable environment for anaerobes. The hydrolysis and acidification of WAS were stimulated by SDZ, and the functional microorganisms were advantageous to VFAs production. The activities of protease, α-glucosidase and acetate kinase were promoted when SDZ occurred, which were beneficial for hydrolysis and acidification. The effect of SDZ on pure strains further confirmed that the formation of VFAs during anaerobic fermentation was stimulated by SDZ.