A cascade of a denitrification bioreactor and an aerobic biofilm reactor for heavy oil refinery wastewater treatment.

ABSTRACT: The performance of an efficient denitrification bioreactor-aerobic biofilm reactor cascade for heavy oil refinery wastewater treatment was investigated. Optimum operation parameters for denitrification were found as follows: (1) hydraulic retention time of 8 h; (2) C/NO₃ ^--N molar ratio of 3.75 with acetate as the carbon source; (3) 20% (v/v) carrier filling ratio in the denitrification bioreactor. Under such optimal conditions, a volumetric removal of 0.82 kg N m^-3 d^-1 was obtained. As an alternative low-cost carbon source to acetate, secondary DAF effluent (COD/NO₃ ^--N mass ratio of 5.4) was also detected and a stable activity of denitrification was achieved with adding 25% volume fraction of secondary DAF effluent. Efflue

SUBMITTER: Dong H 

PROVIDER: S-EPMC9061216 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature