Improved simultaneous nitrification-denitrification in fixed-bed baffled bioreactors treating mariculture wastewater: Performance and microbial community behaviors

Peng Guo; Qiong Wang; Lingfang Ni; Silong Xu; Daoqiong Zheng; Yi Wang; Fang Cai; Mingyu Cui; Zhiwei Zheng; Xiuqing Gao; Dongdong Zhang

doi:10.1016/j.biortech.2023.129468

Improved simultaneous nitrification-denitrification in fixed-bed baffled bioreactors treating mariculture wastewater: Performance and microbial community behaviors

Bioresour Technol. 2023 Oct:385:129468. doi: 10.1016/j.biortech.2023.129468. Epub 2023 Jul 8.

Authors

Peng Guo¹, Qiong Wang¹, Lingfang Ni², Silong Xu³, Daoqiong Zheng², Yi Wang¹, Fang Cai¹, Mingyu Cui⁴, Zhiwei Zheng⁵, Xiuqing Gao⁴, Dongdong Zhang⁶

Affiliations

¹ Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research, Hubei Academy of Agricultural Sciences, Wuhan 430064, China.
² Institute of Marine Biology and Pharmacology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China.
³ School of Chemistry, and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, China.
⁴ Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research, Hubei Academy of Agricultural Sciences, Wuhan 430064, China; College of Biology and Pharmacy, Three Gorges University, Yichang 443002, China.
⁵ Shanghai Yuming Technology Co., Ltd., Shanghai 201802, China.
⁶ Institute of Marine Biology and Pharmacology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China. Electronic address: zhangdongzju@zju.edu.cn.

PMID: 37429548
DOI: 10.1016/j.biortech.2023.129468

Abstract

As mariculture develops, wastewater treatment becomes crucial. In this study, fixed-bed baffled reactors (FBRs) packed with carbon fiber (CFBR) or polyurethane (PFBR) as biofilm carriers were used for mariculture wastewater treatment. Under salinity shocks between 0.10 and 30.00 g/L, the reactors showed efficient and stable nitrogen removal capacities, and the maximum NH₄⁺-N removal rates were 107.31 and 105.42 mg/(L·d) for CFBR and PFBR, respectively, with an initial NH₄⁺-N concentration of 120.00 mg/L. Further, in the independent aerobic chambers of the FBRs for nitrogen removal, taxa enrichment varied depending on the biofilm carrier, and the assembly process was more deterministic in CFBR than in PFBR. Two distinct clusters representing the spatial distribution of the adhering and deposited sludge in CFBR and the front and rear compartments in PFBR were noted. Furthermore, microbial interactions were more numerous and stable in CFBR. These findings improve the application prospects of FBRs in mariculture wastewater treatment.

Keywords: Biofilm; Fixed-bed baffled bioreactors; Mariculture wastewater; Microbial community; Simultaneous nitrification–denitrification.

MeSH terms

Biofilms
Bioreactors
Denitrification
Microbiota*
Nitrification*
Nitrogen
Waste Disposal, Fluid
Wastewater

Substances

Wastewater
Nitrogen