期刊
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
卷 123, 期 -, 页码 191-199出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2017.06.022
关键词
Microbial community structure; Potato starch processing wastewater; Zero valent iron; 16S rRNA high-throughput sequencing; Hydrolysis-acidification; Methanogenesis
资金
- Major Science and Technology Program for Water Pollution Control and Management [2013ZX07201007]
- Harbin Institute of Technology Environment and Ecology Innovation Special Funds [HSCJ201614]
The effect(s) of zero-valent iron (ZVI) in anaerobic digestion and its related impact on microbial community structure is still unclear. The effect of addition of 0, 1, 4, 10, 20 g/L ZVI on the microbial community structure was investigated during methanation from potato starch processing wastewater (PSPW). Methane production rate constants (k) obtained from kinetics studies indicated ZVI dosage had impacted on the methanation and microbial community structure. 16S rRNA gene sequencing revealed Chloroflexi, Firmicutes, Euryarchaeota, Bacteroidetes, Proteobacteria, and Synergistetes as dominant phyla in all samples. When ZVI was employed, Chloroflexi, Firmicutes and Euryarchaeota increased by 2.46, 1 and 3.53 times, respectively, whereas Bacteroidetes, Synergistetes, Proteobacteria and Caldiserica decreased. Growth trend was similar for populations of the genus Methanosaeta, Levilinea, Longilinea and Syntrophomonas. Microbial community shift was most pronounced in assays with 10 and 20 ZVI. ZVI dosed reactors performed better at methanation as opposed to non-ZVI dosed reactor and 10 ZVI was the optimum dose. The study revealed that, ZVI had impacted positively on the microbial community structure to favor and enhance both hydrolysis-acidification and methanogenesis processes during PSPW digestion. (C) 2017 Elsevier Ltd. All rights reserved.
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