NIE Jian-feng,ZENG Chao.Design of Upgrading and Reconstruction of Carrousel Oxidation Ditch Process in Three Gorges Reservoir Area[J].China Water & Wastewater,2020,36(18 18):66-69.
Design of Upgrading and Reconstruction of Carrousel Oxidation Ditch Process in Three Gorges Reservoir Area
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
18 18
Page:
66-69
Column:
Date of publication:
2020-09-17
- Abstract:
- The design scale of a WWTP in Three Gorges Reservoir Area was 30 000 m3/d， the main treatment process of this WWTP was Carrousel oxidation ditch， the effluent was adapted to the first level B standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918—2002). During the upgrading and reconstruction project, the efficiency of nitrogen and phosphorus removal in the biochemical system was improved in order to meet the new emission standards. Aiming at the problems that the effect of nitrogen and phosphorus removal in Carrousel oxidation ditch was not good, and it was difficult to meet the new discharge standard, the process was reconstructed by adding a new pre-anoxic tank, changing the nitrification and sludge return method, and adding multi-point water inflow. The actual operation results showed the average removal efficiency of TN, TP and ammonia nitrogen were improved. The effluent quality could meet the first level A standard of GB 18918-2002 stably.
Last Update:
2020-09-17