Enhanced treatment of low-temperature and low carbon/nitrogen ratio wastewater by corncob-based fixed bed bioreactor coupled sequencing batch reactor

Zhiming Wang; Mengqi Zheng; Chunhua He; Zhenhu Hu; Yipeng Yu; Wei Wang

doi:10.1016/j.biortech.2022.126975

Enhanced treatment of low-temperature and low carbon/nitrogen ratio wastewater by corncob-based fixed bed bioreactor coupled sequencing batch reactor

Bioresour Technol. 2022 May:351:126975. doi: 10.1016/j.biortech.2022.126975. Epub 2022 Mar 9.

Authors

Zhiming Wang¹, Mengqi Zheng², Chunhua He¹, Zhenhu Hu¹, Yipeng Yu³, Wei Wang¹

Affiliations

¹ Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China; Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei 230024, China.
² Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China; Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei 230024, China. Electronic address: mqz@hfut.edu.cn.
³ Hefei Municipal Design Institute Co., Ltd, Hefei 230041, China.

PMID: 35276374
DOI: 10.1016/j.biortech.2022.126975

Abstract

In this study, a combined corncob-based fixed bed bioreactor and sequencing batch reactor system (CCF-SBR) was developed to treat low-temperature (3-12 °C) and low carbon/nitrogen ratio (C/N = 2) wastewater with a single SBR as the control. Results showed similarly low COD concentration of CCF-SBR (20.4 ± 3.7 mg·L^-1) and control SBR (24.9 ± 6.7 mg·L^-1) effluent. However, the total nitrogen (TN) removal rate of CCF-SBR was significantly higher than that of control SBR (29.6 ± 2.7% vs 8.6 ± 2.3%). According to the nitrification and denitrification activities and the analysis of microbial community, CCF mainly played the role of denitrification based on fermentation genera and denitrifying genera, and SBR mainly implemented nitrification with Nitrospira and Acinetobacter. This study explores a promising way for agricultural waste resource utilization and wastewater treatment under low-temperature and low C/N ratio.

Keywords: Corncob; Enhanced denitrification; Low C/N ratio wastewater; Low-temperature; Nitrogen removal.

MeSH terms

Bioreactors
Carbon
Denitrification
Nitrification
Nitrogen* / analysis
Temperature
Waste Disposal, Fluid / methods
Wastewater*
Zea mays

Substances

Waste Water
Carbon
Nitrogen