期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 703, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.135532
关键词
Methane production; Hydrogen evolutional corrosion; Volatile fatty acids; Extracellular polymeric substances; Microbial community
资金
- Study on Recycling Technology of C, N, P in Surplus Sludge of Sewage Treatment Plant of the Key Research and Development Project of Shandong Province [2017GSF16108]
- Research on water intrusion repair technology based on water sensitivity of the Natural Science Foundation of Shandong Province [ZR2017LD007]
- Key Research and Development Project of Shandong Province, China [2018GSF117016]
This study evaluated the effects of nano zero-valent iron (NZVI, 50 nm) on anaerobic digestion of high solids sludge (10 +/- 0.5%). Compared to the blank group without NZVI, the group with NZVI at all levels (10, 20 and 30 mM) played a driving role in methane production. The maximal methane production was increased by 37.5% in the group of 30 mM NZVI. The dynamic changes of hydrogen content and VFAs showed that rapid hydrogen evolutional corrosion of NZVI made lower hydrogen partial pressure in the later stage, which was more conducive to conversion of propionic acid. The microscopic analysis indicated that NZVI could flocculate and adsorb on the extracellular polymeric substances (EPS) around the anaerobic microorganisms, protecting most active microbial cell membrane from contact damage. On the other hand, some decaying microbial cells membrane could be destroyed by NZVI and intracellular substances would be released due to the reduction of EPS. (C) 2019 Elsevier B.V. All rights reserved.
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