期刊
WATER SCIENCE AND TECHNOLOGY
卷 79, 期 7, 页码 1253-1262出版社
IWA PUBLISHING
DOI: 10.2166/wst.2019.116
关键词
denitrification; microorganism community characterization; redox mediators; temperature
资金
- National Natural Science Foundation of China [51308374]
- 2017 undergraduate innovation project at Tianjin Chengjian University [201810792085]
- Tianjin Key Laboratory of Aquatic Science and Technology
- Tianjin University's `'Young and Middle-aged Innovative Talents Training Program' [180501526]
Four sequential batch reactors (SBRs) containing synthetic sewage for denitrification were investigated in this study. Three of them had added one of the three redox mediators, which were anthraquinone-1,5-disulfonate (AQDS), 1,2-naphthoquinone-4-sulfonate (NQS), and 2-hydroxy-1,4-naphthoquinone (LAW), operated at 20 degrees C and 10 degrees C, and an additional one to serve as the control. Results showed that 10 degrees C inhibited denitrification to a considerable extent, but the addition of mediators increased the denitrification rate and efficiency. The total nitrogen removal efficiency increased in the presence of three different redox mediators (100 mu mol/L), among which LAW express the best accelerating effectiveness at normal temperature and NQS at low temperature. This may be due to the growth of microorganisms, whose community compositions changed considerably when the different redox mediators were added. Therefore, Illumina MiSeq sequencing was used to identify the different microbial communities. Thauera was dominant at 10 degrees C (25.60%). Furthermore, the addition of mediators greatly promoted Thauera growth (31.11%-42.41%), especially LAW (42.41%). At 20 degrees C, Candidatus Competibacter (8.31%-9.59%) and Denitratisoma (6.33%-7.39%) were dominant. Thauera and Denitratisoma are denitrifiers. These results could improve understanding of the sewage biological process at low temperature.
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