Enhanced treatment of low-temperature and low carbon/nitrogen ratio wastewater by corncob-based fixed bed bioreactor coupled sequencing batch reactor. (May 2022)

• Record Type: Journal Article
• Authors: Wang, Zhiming; Zheng, Mengqi; He, Chunhua; Hu, Zhenhu; Yu, Yipeng; Wang, Wei
• Is Part Of: Bioresource technology. Volume 351(2022)
• Publication Date: 2022-05
• Subjects: Low-temperature -- Low C/N ratio wastewater -- Corncob -- Nitrogen removal -- Enhanced denitrification; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.126975
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: CCF-SBR efficiently treated wastewater at low-temperature and low C/N ratio. Corncob was used as carbon sources and biofilm carriers. CCF played a keystone role in nitrogen removal in CCF-SBR. CCF enhanced the synergy between fermentation and denitrifying bacteria. 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.