LIU Kun,WANG Xin?ji,ZHANG Nian?dong,et al.Start?up Commissioning of Modified Oxidation Ditch Process and Optimal Control of Its Nitrogen and Phosphorus Removal[J].China Water & Wastewater,2022,38(No.2):116-121.
Start?up Commissioning of Modified Oxidation Ditch Process and Optimal Control of Its Nitrogen and Phosphorus Removal
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第2
Page:
116-121
Column:
Date of publication:
2022-01-17
- Keywords:
- modified Carrousel 2000 oxidation ditch; start-up commissioning; sludge floating; trial operation
- Abstract:
- The modified Carrousel 2000 oxidation ditch process is adopted in the second sewage treatment plant in Dabancheng District, Urumqi. The causes to problems of sludge floating and effluent TN and TP exceeding standard during commissioning are found out through testing the main water quality indicators and microbiological microscopic inspections, in combination with the process operating parameters of the sewage treatment plant. They include sludge aging and floating in the oxidation ditch caused by excessive sludge age and aeration amount, the denitrification failure and accompanied sludge floating in the secondary sedimentation tank caused by high DO in anoxic section if alkalinity and carbon source are not supplemented in time, and poor dephosphorization effect caused by excessive sludge age. After two months of trial operation to adjust the relevant operating parameters, although the influent water volume was small and the water quality fluctuated greatly, the various effluent indicators could stably meet the first level A criteria of Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002). The removal rates of COD, TP, TN, NH4+-N and SS reached 96.7%, 98.5%, 92.4%, 99.3%, 96.5%, respectively.
Last Update:
2022-01-17