Denitrification performance and microbial communities of solid-phase denitrifying reactors using poly (butylene succinate)/bamboo powder composite

Wanhe Qi; Mohammad J Taherzadeh; Yunjie Ruan; Yale Deng; Ji-Shuang Chen; Hui-Feng Lu; Xiang-Yang Xu

doi:10.1016/j.biortech.2020.123033

Denitrification performance and microbial communities of solid-phase denitrifying reactors using poly (butylene succinate)/bamboo powder composite

Bioresour Technol. 2020 Jun:305:123033. doi: 10.1016/j.biortech.2020.123033. Epub 2020 Feb 19.

Authors

Wanhe Qi¹, Mohammad J Taherzadeh², Yunjie Ruan³, Yale Deng⁴, Ji-Shuang Chen⁵, Hui-Feng Lu⁶, Xiang-Yang Xu⁶

Affiliations

¹ Institute of Agricultural Bio-Environmental Engineering, College of Bio-Systems Engineering and Food Science, Yuhangtang Road 866, Hangzhou 310058, PR China.
² Swedish Centre for Resource Recovery, University of Borås, Borås 50190, Sweden.
³ Institute of Agricultural Bio-Environmental Engineering, College of Bio-Systems Engineering and Food Science, Yuhangtang Road 866, Hangzhou 310058, PR China; The Rural Development Academy, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, PR China. Electronic address: ruanyj@zju.edu.cn.
⁴ Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, 6708 WD Wageningen, The Netherlands.
⁵ Institute of Bioresource Engineering, Nanjing Technology University, Nanjing 210009, PR China; Bioresource Institute for Healthy Utilization (BIHU), Zunyi Medical University, Zunyi, Guizhou 563000, China.
⁶ Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.

PMID: 32105848
DOI: 10.1016/j.biortech.2020.123033

Abstract

This study explored the denitrification performance of solid-phase denitrification (SPD) systems packed with poly (butylene succinate)/bamboo powder composite to treat synthetic aquaculture wastewater under different salinity conditions (0‰ Vs. 25‰). The results showed composite could achieve the maximum denitrification rates of 0.22 kg (salinity, 0‰) and 0.34 kg NO₃^--N m^-3 d^-1 (salinity, 25‰) over 200-day operation. No significant nitrite accumulation and less dissolved organic carbon (DOC) release (<15 mg/L) were found. The morphological and spectroscopic analyses demonstrated the mixture composites degradation. Microbial community analysis showed that Acidovorax, Simplicispira, Denitromonas, SM1A02, Marinicella and Formosa were the dominant genera for denitrifying bacteria, while Aspergillus was the major genus for denitrifying fungus. The co-network analysis also indicated the interactions between bacterial and fungal community played an important role in composite degradation and denitrification. The outcomes provided a potential strategy of DOC control and cost reduction for aquaculture nitrate removal by SPD.

Keywords: Bacterial community; Fungal community; PBS/Bamboo composite; RAS effluent treatment; Solid-phase denitrification.