THE FEASIBILITY STUDY OF SIMULTANCEOUS REMOVAL OF NITRATE AND ATRAZINE BY SOLID-PHASE AEROBIC DENITRIFICATION

The feasibility of simultaneous removal of nitrate and atrazine from contaminated water using solid-phase aerobic denitrification was studied． The carbon releasing characteristics results indicated that the starch granules turned to be the most suitable carbon source． Volumetric denitrification rate was 7. 03 mg / ( L h) with the intial nitrate concentration of 55 ～ 60 mg /L under the batch experiments， which indicated that nitrate could be effectively removed． There was no effect on aerobic denitrification process with the atrazine concentration less than 10 mg /L， and the denitrification was repressed when atrazine concentration increased to 20 mg /L． When the initial concentration of atrazine was 0. 1 mg /L and 1 mg /L， the removal efficiency of atrazine was 93% and 94. 8% within 24 h under aerobic denitrification condition， respectively． Atrazine removal was mainly due to the absorption onto solid carbon source．