期刊
ENVIRONMENT INTERNATIONAL
卷 127, 期 -, 页码 353-360出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2019.03.045
关键词
Biohybrid system; Autotrophic denitrification; Semiconductors; Cadmium sulfide; Nitrous oxide
资金
- National Natural Science Foundation of China [21607023, 41671264, 91751109]
N2O (Nitrous oxide, a booster oxidant in rockets) has attracted increasing interest as a means of enhancing energy production, and it can be produced by nitrate (NO3-) reduction in NO3--loading wastewater. However, conventional denitrification processes are often limited by the lack of bioavailable electron donors. In this study, we innovatively propose a self-photosensitized nonphototrophic Thiobacillus denitrificans (T. denitrificans-CdS) that is capable of NO(3)(-)reduction and N2O production driven by light. The system converted > 72.1 +/- 1.1% of the NO3--N input to N2O-N, and the ratio of N2O-N in gaseous products was > 96.4 +/- 0.4%. The relative transcript abundance of the genes encoding the denitrifying proteins in T. denitrificans-CdS after irradiation was significantly upregulated. The photoexcited electrons acted as the dominant electron sources for NO(3)(-)reduction by T. denitrificans-CdS. This study provides the first proof of concept for sustainable and low-cost autotrophic denitrification to generate N2O driven by light. The findings also have strong implications for sustainable environmental management because the sunlight-triggered denitrification reaction driven by nonphototrophic microorganisms may widely occur in nature, particularly in a semiconductive mineral-enriched aqueous environment.
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