ZHAOJun-na.Effect of Internal Reflux Ratio on Nitrogen Removal in A2O Process under Low Load Operation[J].China Water & Wastewater,2022,38(5):81-83.
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Effect of Internal Reflux Ratio on Nitrogen Removal in A2O Process under Low Load Operation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第5期 Page: 81-83 Column: Date of publication: 2022-03-01
Author(s):
ZHAO　Jun-na
（Cangzhou Water Supply and Drainage Group Co. Ltd.， Cangzhou 061000， China）
Keywords:
low load operation;  internal reflux ratio;  A2O;  carbon source;  nitrogen removal
Abstract:
The effects of internal reflux ratio on nitrogen removal efficiency and carbon source dosage of A2O process under low load operation were investigated. When the internal reflux ratio was reduced from 400% to 200%, NO3--N in the effluent of anoxic tank decreased from 5 mg/L to approximately 2 mg/L, and the process lasted for about 6 hours. Under the same carbon source dosage, compared with internal reflux ratio of 400%, the total nitrogen removal efficiency increased by 22.4% when the internal reflux ratio was 200%. The carbon source dosage could be saved by 13.8% when the same NO3--N in the effluent of the aerobic tank was maintained.
Last Update: 2022-03-01