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Effects of residual organics in municipal wastewater on hydrogenotrophic denitrifying microbial communities

Journal of Environmental Sciences 2018年第3期30卷 262-270页

作者： Wei Xing Jinlong Li Peng Li Chong Wang Yanan Cao Desheng Li Yunfeng Yang Jizhong Zhou Jiane Zuo School of Civil Engineering Beijing Jiaotong University Beijing 100044 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard Beijing 100044 China College of Science Flunan Agricultural University Changsha 410128 China Institute for Environmental Genomics and Department of Microbiology and Plant Biology University of Oklahoma Norman OK 73019 USA Earth Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

hydrogenotrophic denitrification is promising for tertiary nitrogen removal from municipal wastewater. To reveal the influence of residual organics in municipal wastewater on hydrogenotrophic denitrifiers, we adopted high-throughput 16 S r RNA gene amplicon sequencing to examine microbial communities in hydrogenotrophic denitrification enrichments. Using effluent from a municipal wastewater treatment plant as water source, COD,nitrate and p H were controlled the same except for a gradient of biodegradable carbon（i.e., primary effluent（PE）, secondary effluent（SE）, or combined primary and secondary effluent（CE））. Inorganic synthetic water（IW） was used as a control. Hydrogenophaga, a major facultative autotroph, accounted for 17.1%, 5.3%, 32.7% and 12.9% of the sequences in PE, CE,SE and IW, respectively, implicating that Hydrogenophaga grew well with or without ***, which contains likely obligate autotrophic denitrifiers, appeared to be the most dominant genera（23.6%） in IW and accounted for 2.5%, 4.6% and 8.9% in PE, CE and SE,respectively. Thermomonas, which is related to heterotrophic denitrification, accounted for 4.2% and 7.9% in PE and CE fed with a higher content of labile organics, *** contrast, Thermomonas was not detected in IW and accounted for only 0.6% in SE. Our results suggest that Thermomonas are more competitive than Thauera in hydrogenotrophic denitrification with biodegradable organics. Moreover, facultative autotrophic denitrifiers,Hydrogenophaga, are accommodating to residual organic in effluent wastewater, thus we propose that hydrogenotrophic denitrification is amenable for tertiary nitrogen removal.

关键词： Tertiary nitrogen removal hydrogenotrophic denitrification Residual organics High-throughput sequencing Hydrogenophaga

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