Aerobic Denitrification Microbial Community and Function in Zero-Discharge Recirculating Aquaculture System Using a Single Biofloc-Based Suspended Growth Reactor: Influence of the Carbon-to-Nitrogen Ratio.

ABSTRACT: In this study, the effect of aerobic denitrification on nitrogen removal was investigated using two zero-discharge biofloc-based recirculating aquaculture systems with representative carbon-to-nitrogen (C/N) ratios of 15 (CN15) and 20 (CN20). Aquaculture wastewater, residual feed, and fish feces were treated in an aerated suspended growth reactor (SGR, dissolved oxygen > 5.0 mg L^-1). Low toxic NH₃ (<0.1 mg L^-1) and NO₂ ^--N (<0.5 mg L^-1) concentrations and high NO₃ ^--N (83.3%) and NO₂ ^--N (100%) removal efficiencies were achieved in the fish tank and SGR of CN20, respectively. The nitrogen mass balances indicated that the gaseous nitrogen loss accounted for 72-75% of the nitrogen in

SUBMITTER: Deng M 

PROVIDER: S-EPMC7417430 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature