title: Using rice straw fermentation liquor to produce bioflocculants during an anaerobic dry fermentation process.
abstract: In this study, fermentation liquor from rice straw was used to produce bioflocculants during a dry fermentation process. Acetic acid and butyric acid were the predominant VFAs during the process. A compound bioflocculant producing inoculum, F(+) was inoculated into compound media in which fermentation liquor and conventional bioflocculants medium at different ratios. The maximum flocculation activity, 92.45% was achieved when 100-day fermentation liquor and conventional bioflocculants medium were mixed at an equal ratio. Furthermore, 454-pyrosequencing technology was used to measure bacterial diversity on the 25th day of operation, which was a period of rapid VFA accumulating. A total of 2110 sequences were obtained, and were found to be affiliated with 8 phylogenetic groups, including Actinobacteria, Acidobacteria, Bacteroidetes, Firmicutes, Proteobacteria, Chloroflexi, Spirochaetes and Synergistetes. Notably, Firmicutes (92.3%) was the dominant microbial population, followed by Actinobacteria (2.37%) and Proteobacteria (1.04%).
authors.affiliation: State Key Laboratory of Urban Water Resources and Environments (SKLUWRE), School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. zhaoguanghit@126.com
authors.forename: Guang
authors.initials: G
authors.lastname: Zhao
authors.forename: Fang
authors.initials: F
authors.lastname: Ma
authors.forename: Li
authors.initials: L
authors.lastname: Wei
authors.forename: Hong
authors.initials: H
authors.lastname: Chua
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D019149:Bioreactors; D017931:DNA Primers; D005285:Fermentation; D005427:Flocculation; D012275:Oryza / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics
chemical_list: D017931:DNA Primers; D012336:RNA, Ribosomal, 16S