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Bioaugmentation with Diaphorobacter polyhydroxybutyrativorans to enhance nitrate removal in a poly
Shusong Zhang1, Xingbin Sun2, Xuming Wang3
1Beijing Agro-Biotechnology Research Center, Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing 100097, China; Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; College of Life Science, Northeast Forestry University, Harbin 150040, China.
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).
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