Bioaugmentation with Diaphorobacter polyhydroxybutyrativorans to enhance nitrate removal in a poly (3-hydroxybutyrate-co-3-hydroxyvalerate)-supported denitrification reactor

Bioresource Technology
Shusong ZhangQingjing Zhang

Abstract

A newly isolated and identified Diaphorobacter polyhydroxybutyrativorans strain (SL-205) was employed to enhance the denitrification performance of a laboratory-scale solid-phase denitrification (SPD) reactor using poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) as a carbon source, and dynamic variations in microbial communities in the reactor were investigated. Results indicated that bioaugmentation with strain SL-205 enabled rapid reactor startup and improved denitrification performance relative to the reactor inoculated with activated sludge. Illumina sequencing revealed that bioaugmentation also significantly increased Proteobacteria abundance along with increased influent nitrate loading. Additionally, two genera of PHBV-degrading denitrifers, Diaphorobacter and Acidovorax, exhibited higher abundance, and elevated expression of denitrification-associated genes (narG, nirK, and nirS) was observed following bioaugmentation relative to the control at influent nitrate loading ranging from 1.28 g N/(L·d) to 1.6 g N/(L·d).

Citations

Jul 16, 2019·Environmental Science and Pollution Research International·Zhongshuo XuXiaoli Chai
Feb 12, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yiqi CaoBaiyu Zhang
Jan 22, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Weiwei MaHao Zhu
Feb 5, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Shiyang ZhangKefeng Zhang
Apr 12, 2021·The Science of the Total Environment·Feifan ZhangShiyang Li

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