ZHUXiao-chao,FENGYa-bing,TAOHui,et al.Design of CAST Enhanced Denitrification and Phosphorus Removal Upgrading and Reconstruction Project in a Wastewater Treatment Plant[J].China Water & Wastewater,2023,39(2):58-62.
Design of CAST Enhanced Denitrification and Phosphorus Removal Upgrading and Reconstruction Project in a Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第2期
Page:
58-62
Column:
Date of publication:
2023-01-17
- Abstract:
- The design scale of a municipal wastewater treatment plant in Jiangsu is 2.5×104 m3/d. The main process was CAST, and the effluent quality was required to meet first level B discharge standard. To improve the effluent quality to the first level A discharge standard, the original CAST process was modified and the micro-flocculation filtration advanced treatment process was added in the upgrading and reconstruction project. Aerators were installed in the biological selection zone of CAST tank, which were changed to the main reaction zone instead, and thus the problem of sludge accumulation was solved. The nitrogen removal performance of the system was improved by installing agitators in the main reaction zone and setting anoxic agitation period in the operation cycle. The single point sludge discharge of the excess sludge pump was replaced by the perforated sludge discharge pipe to improve the sludge discharge efficiency. The cyclone aerator was changed to microporous aerator to improve the efficiency of oxygen utilization. PAC was added to CAST tank for simultaneous chemical phosphorus removal. The project has been in operation for more than one year after completion, and the effluent quality has stably reached first level A discharge standard.
Last Update:
2023-01-17