Cultivating river sediments into efficient denitrifying sludge for treating municipal wastewater.

ABSTRACT: The river sediment contains a lot of pollutants in many cases, and needs to be treated appropriately for the restoration of water environments. In this study, a novel method was developed to convert river sediment into denitrifying sludge in a sequencing batch reactor (SBR). The river sediment was added into the reactor daily and the hydraulic retention time (HRT) of the reactor was gradually reduced from 8 to 4 h. The reactor achieved in the N O 3   - N removal efficiency of 85% with the N O 3   - N removal rate of 0.27 kg N m^-3 d^-1. Response surface analysis represents that nitrate removal was affected mainly by HRT, followed by sediment addition. The denitrifying sludge achieved the highest activity with the following conditions: N O 3   - N 50 mg l^-1

SUBMITTER: Hou L 

PROVIDER: S-EPMC6774965 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature