Comparision of nitrogen removal characteristic and microbial community in freshwater and marine recirculating aquaculture systems

Zhang, Wenqian; Liu, Bo; Sun, Zhenzhu; Wang, Tingyu; Tan, Simin; Fan, Xiaohui; Zou, Danyang; Zhuang, Yutong; Liu, Xinting; Wang, Yizhu; Li, Yanyu; Mai, Kangsen; Ye, Chaoxia

doi:10.1016/j.scitotenv.2023.162870

Cited by 12 publications

(1 citation statement)

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“…Biofilms are three-dimensional structures, and aerobic and anaerobic bacteria can colonize their aerobic surface regions and anaerobic inner regions, respectively [6]. In the past, aerobic nitrifying bacteria on biofilms have been commonly used to convert ammonia to nitrate in RASs [7,8], but the action of anaerobic microbes on biofilms has often been overlooked, and the endogenous carbon in biofilms has not been utilized at all. Recent studies have shown that RAS biofilms can effectively remove nitrate from aquaculture water, even at low COD/NO 3 − -N (C/N) concentrations.…”

Section: Introductionmentioning

confidence: 99%

A Simultaneous Denitrification and Fermentation Process for Nitrate Removal in a Whiteleg Shrimp (Litopenaeus vannamei) Recirculating Aquaculture System: Using Endogenous Carbon from a Biofilm

Li,

Lu,

Zhang

et al. 2023

JMSE

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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. 15N 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. 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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Section: Introductionmentioning

confidence: 99%