State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Bioresour Technol. 2019 Dec;293:122020. doi: 10.1016/j.biortech.2019.122020. Epub 2019 Aug 17.
A lab-scale acidogenic sulfate-reducing reactor with N stripping was continuously operated to uncover its microbial mechanism treating highly sulfate-containing organic wastewaters. Results showed that sulfate reduction efficiency decreased with the influent COD/sulfate ratios. Microbial community analysis showed that VFA accumulation mainly caused by the predominance of fermentative bacteria including Streptococcus and Oceanotoga. Genus Desulfovibrio was the most predominant SRB and enriched at low influent COD/sulfate ratios. Although Bifidobacterium, Atopobium, Wohlfahrtiimonas, Dysgonomonas etc. had low average abundance, they were identified keystone genera by the co-occurrence network analysis. The functions of the microbial community were not insignificantly influenced by COD/sulfate ratios. All predicted functional genes involved in dissimilatory sulfate reduction reached their maximum abundances at influent COD/sulfate ratio of 1.5, while the assimilatory sulfate reduction was favored at the COD/sulfate ratio lower than 2.
采用具有 N 脱除功能的实验室规模产酸硫酸盐还原反应器，连续运行以揭示其处理高含硫酸盐有机废水的微生物机制。结果表明，硫酸盐还原效率随进水 COD/硫酸盐比的降低而降低。微生物群落分析表明，VFA 积累主要是由于发酵细菌（包括链球菌属和海洋弧菌属）的优势生长所致。脱硫弧菌属是最主要的硫酸盐还原菌，并在低进水 COD/硫酸盐比下富集。虽然双歧杆菌属、阿托波氏菌属、沃氏菌属、Dysgonomonas 等的平均丰度较低，但它们通过共现网络分析被鉴定为关键属。微生物群落的功能不受 COD/硫酸盐比的显著影响。所有参与异化硫酸盐还原的预测功能基因在进水 COD/硫酸盐比为 1.5 时达到最大丰度，而在 COD/硫酸盐比低于 2 时有利于同化硫酸盐还原。
