| Title | Distinct functional microbial communities mediating the heterotrophic denitrification in response to the excessive Fe(II) stress in groundwater under wheat-rice stone and rock phosphate amendments |
| Authors | Liu, Ying Sheng, Yizhi Feng, Chuanping Chen, Nan Liu, Tong |
| Affiliation | China Univ Geosci, Sch Water Resources & Environm, Beijing 100083, Peoples R China Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China Miami Univ, Dept Geol & Environm Earth Sci, Oxford, OH 45056 USA |
| Keywords | AUTOTROPHIC DENITRIFICATION PORPHYRITIC ANDESITE NITRATE REDUCTION OXIDATION REMOVAL SYSTEM ACIDOGENESIS ATTENUATION REMEDIATION HYDROLYSIS |
| Issue Date | Jun-2020 |
| Publisher | ENVIRONMENTAL RESEARCH |
| Abstract | Denitrifying microbial community can be utilized for eliminating nitrate and Fe(II) combined contamination in groundwater, while excessive amount of Fe(II) limit the process. Natural mineral can be additional substrate for the microbial growth, whereas how it influences the microbial community that mediating the denitrification coupling with Fe(II) oxidation and balancing inhibition of excessive Fe(II) on denitrification remain unclear. In the present study, we conducted a series of microcosm experiments to explore the denitrification and Fe(II) oxidation kinetic, and used RNA-based qPCR and DNA-based high-throughput sequencing to elucidate microbial diversity, co-occurrence and metabolic profiles amended by wheat-rice stone and rock phosphate. The results showed that both minerals could extensively improve and double the denitrification rates (2.0 +/- 0.03 to 2.12 +/- 0.13 times), decrease the nitrite accumulation and trigger the high resistance of the denitrifiers from the stress of Fe(II), whereas only wheat-rice stone with higher surface area increased the oxidation of Fe(II) (< 10%). The addition of both minerals enhanced the microbial alpha-diversity, shaped the beta-diversity and co-occurrence network, and recovered the transcription of nitrate and nitrite reductase (Nar, Nap, NirS, NirK) from the Fe(II) inhibition. Accordingly, heterotroph Methyloversatilis sp., Methylotenra sp. might contribute to the denitrification under wheat-rice stone amendment, Denitratisoma sp. contribute to the denitrification for rock phosphate, and Fe oxidation was partially catalyzed by Dechloromonas sp. or abiotically by the nitrite/nitrous oxide. These findings would be helpful for better understanding the bioremediation of nitrate and Fe contaminated groundwater. |
| URI | http://hdl.handle.net/20.500.11897/588639 |
| ISSN | 0013-9351 |
| DOI | 10.1016/j.envres.2020.109391 |
| Indexed | SCI(E) Scopus |
| Appears in Collections: | 地球与空间科学学院 造山带与地壳演化教育部重点实验室 |
