期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108614
关键词
Anaerobic digestion; Extracellular polymeric substances; Microbial community structure; Toxic mechanism
资金
- National Natural Science Foundation of China [21868004]
- Key Research and Development Plan of Guangxi Province [GuikeAB19259013]
- Guangxi Natural Science Foundation [2022GXNSFAA035486, 2021GXNSFBA196094]
- Joint fund of Guangxi University [GXU-BFY-2020-018]
The study found that a low concentration of UF resin had minimal impact on AnGS activity, while high concentrations decreased methane production and COD removal while increasing SCFA production. Additionally, high concentrations of UF resin inhibited EPS production, leading to the fragmentation of AnGS and decreased cell viability.
The effects of urea formaldehyde (UF) resin on the performance and characteristics of anaerobic granular sludge (AnGS), the microbial community and related inhibition mechanisms were studied. During the exposure period, a low concentration of UF resin (0.1 g/L) had no significant effect on the AnGS activity, while a high concen-tration of UF resin (0.2 g/L, 0.5 g/L) decreased methane production and chemical oxygen demand (COD) removal by 16.5-19.7% and 6.4-7.9%, and short-chain fatty acid (SCFA) increased by 17.1-18.9%. Meanwhile, a low concentration of UF resin could stimulate cell stress, induce the production of more EPS and realize the self-defence mechanism; however, a higher UF resin concentration will inhibit the production of EPS, the extracel-lular polymer in the reactor with high concentration of UF resin was only 83.1-69.3% of that in control group, it leads to the crushing of AnGS and the decline of cell viability. In addition, high concentration of UF resin reduced the relative abundance of Proteobacteria and Bacteroidota by 9.2%-16.7% and 8.0%-10.5% respectively, led to the decline of bacterial diversity and richness, and the metabolic performance in anaerobic system was pre-pared. UF resin induced oxidative stress has been proved to be the main reason for the decline of AnGS activity, this is reflected in the increase of reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release, this further explains the reason why UF resin inhibits sludge acidification and methanation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据