A Simultaneous Denitrification and Fermentation Process for Nitrate Removal in a Whiteleg Shrimp (Litopenaeus vannamei) Recirculating Aquaculture System: Using Endogenous Carbon from a Biofilm
文献类型： 外文期刊
作者： Li, Yayuan 1 ; Lu, Shimin 1 ; Zhang, Wang 1 ; Liu, Xingguo 1 ; Jiang, Haixin 4 ; Liu, Chong 1 ; Yuan, Zehui 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Fishery Machinery & Instrument Res Inst, Shanghai 200092, Peoples R China
2.Shanghai Ocean Univ, Coll Fisheries & Life, Shanghai 201306, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Aquaculture Facil Engn, Shanghai 200092, Peoples R China
4.Tongji Univ, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China
关键词： heterotrophic denitrification; N-15-tracer technique; recirculating aquaculture system; Nitrospira; endogenous carbon from the biofilm
期刊名称：JOURNAL OF MARINE SCIENCE AND ENGINEERING （ 影响因子：2.9； 五年影响因子：2.9 ）
ISSN：
年卷期： 2023 年 11 卷 12 期
页码：
收录情况： SCI
摘要： During the process of circulating aquaculture, high concentrations of nitrate will accumulate. A simultaneous denitrification and fermentation process is described to remove nitrate from a recirculating aquaculture system using endogenous carbon on a biofilm. N-15 isotope technology was used to assess the nitrate removal, mainly through heterotrophic denitrification. The nitrate removal rate could be as high as 98.97%, with a final concentration of nitrate below 1 mg/L. The denitrification process obeys a Michaelis-Menten-type enzyme kinetic model, with a half saturation constant of 99.91 mg/L and a maximum nitrate removal rate of 0.39 mg L-1 h(-1) at 28 C-degrees. The functional genes narG and narH for nitrate removal were obtained from Nitrospirae spp. at proportions of 39.13% and 26.16%, respectively. The acetate, propionate and iso-valerate produced by anaerobic fermentation provided the principal electron donors for denitrification.
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