期刊
WATER RESEARCH
卷 226, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.119258
关键词
Sulfur autotrophic denitrification; Constructed wetlands; Nitrogen removal; Low C/N; Nitrogen and sulfur cycle
资金
- National Natural Science Foundation of China
- Shenzhen Science and Technology Program
- [52000054]
- [GXWD20201230155427003- 20200822095642002]
- [KQTD20190929172630447]
Constructed wetlands integrated with sulfur autotrophic denitrification using elemental sulfur as the carbon source have the potential to efficiently remove nitrogen from carbon-limited wastewater. The sulfur autotrophic denitrification process in the SCW enhances nitrate removal efficiency and rate. The combined CW-SCW system allows for simultaneous removal of total ammonia nitrogen and nitrate.
Constructed wetlands (CWs) integrated with sulfur autotrophic denitrification to stimulate high-rate nitrogen removal from carbon-limited wastewater holds particular application prospect due to no excessive carbon source addition, high efficiency, and good stability. In this study, we conducted elemental sulfur-based constructed wetland (SCW) and traditional constructed wetland (CW) under different C/N (2, 1, and 0.5) to explore the feasibility and mechanisms for nitrogen removal from low C/N wastewater. Compared with CW, SCW was demonstrated more robust in nitrogen removal in the case of low C/N influent. When the influent C/N control was at 0.5, SCW observed total nitrogen (TN) and nitrate removal efficiency of 69.36 +/- 3.96% and 81.71 +/- 3.96%, with the corresponding removal rate of 1.18 +/- 0.66 and 1.70 +/- 0.92 g-N.m(-)(2).d(-1) , which were 2.11 and 10.03 times of CW, respectively. The nitrate removal rate constant k in the SCW was 1.05, 3.83, and 10.33 times higher than the CW with C/N of 2, 1 and 0.5. Furthermore, 14.40, 54.51, and 79.82% of nitrogen were removed by the sulfur autotrophic denitrification (SAD) in SCW, which also contributed 43.89, 73.68, and 71.70% of sulfate production. Moreover, the combined system of CW-SCW is proved be an efficient operation mode for simultaneously removing total ammonia nitrogen (TAN) and nitrate. In the SCW, the richness of the microbial community was improved and sulfur-oxidizing genera (e.g. Thiobacillus, Sulfurimonas) was selectively enriched, which affect the performance the elemental sulfur-based denitrification process. The nitrate reduction pathway was overwhelmed by denitrification and the dissimilatory nitrate reduction process. These findings offer elemental sulfur-based autotrophic denitrification constructed wetland has excellent potential to enhance nitrogen removal from carbon-limited wastewater.
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