Culturable nitrogen-transforming bacteria from sequential sedimentation biofiltration systems and their potential for nutrient removal in urban polluted rivers.

ABSTRACT: Novel heterotrophic bacterial strains-Bzr02 and Str21, effective in nitrogen transformation, were isolated from sequential sedimentation-biofiltration systems (SSBSs). Bzr02, identified as Citrobacter freundii, removed up to 99.0% of N-NH₄ and 70.2% of N-NO₃, while Str21, identified as Pseudomonas mandelii, removed up to 98.9% of N-NH₄ and 87.7% of N-NO₃. The key functional genes napA/narG and hao were detected for Bzr02, confirming its ability to reduce nitrate to nitrite and remove hydroxylamine. Str21 was detected with the genes narG, nirS, norB and nosZ, confirming its potential for complete denitrification process. Nitrogen total balance experiments determined that Bzr02 and Str21 incorporated nitrogen into cell biomass (up to 94.7% and 74.7

SUBMITTER: Font Najera A 

PROVIDER: S-EPMC8018948 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature