TIAN Min,CUI Tao,LU Kai,et al. Denitrification Performance Evaluation of A2/O Process in Xi’an Fourth Wastewater Treatment Plant [J].China Water & Wastewater,2020,36(13):1-6.
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Denitrification Performance Evaluation of A2/O Process in Xi’an Fourth Wastewater Treatment Plant

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第36卷 Number: 13 Page: 1-6 Column: Date of publication: 2020-07-01
Author(s):
TIAN Min1; CUI Tao1; LU Kai2; ZHAO Wen-zhao2; PENG Dang-cong 2
(1. Xi’an Sewage Treatment Co. Ltd., Xi’an 710024, China; 2. School of Environmental and
Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)
Keywords:
A2/O process; biological nitrogen removal; secondary sedimentation tank; endogenous denitrification
Abstract:
In order to evaluate the denitrification performance of A2/O process in Xi’an Fourth Wastewater Treatment Plant, the nitrogen components and nitrification activity in the biological reaction tanks (anaerobic tank, anoxic tank and aerobic tank) and secondary sedimentation tank were determined. As the separation unit of the A2/O process, the secondary sedimentation tank contributed as high as 13%-60% of the TN removal, and the removal mechanism was endogenous denitrification. Sludge concentration had an important influence on the TN removal. When the sludge concentration was high, the average TN removal rate was 89%;when the sludge concentration was low, the average TN removal rate was 69%. The endogenous denitrification process in the secondary sedimentation tank can provide an important reference for design and operation of efficient biological nitrogen removal process and the improvement of effluent quality and treatment efficiency of WWTPs.
Last Update: 2020-07-01