XUXiong-kun,CHENYang-yu,QIYang-jun,et al.Waterfall Reoxygenation Engineering Reconstruction with Liquid Level as the Core in a Municipal WWTP[J].China Water & Wastewater,2024,40(20):95-99.
Waterfall Reoxygenation Engineering Reconstruction with Liquid Level as the Core in a Municipal WWTP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第20期
Page:
95-99
Column:
Date of publication:
2024-10-17
- Keywords:
- nitrogen removal; waterfall reoxygenation; deep denitrification bed filter; composite carbon source; utilization of carbon source
- Abstract:
- The phenomenon of waterfall reoxygenation is common in Chinese wastewater treatment plants (WWTPs), which leads to ineffective loss of carbon source and high nitrogen removal cost. Thus reducing and eliminating waterfall reoxygenation is concerned. According to the needs of efficient nitrogen removal and operation cost saving in a WWTP of Minjiang River basin in Sichuan Province, the waterfall reoxygenation control project with liquid-level as the core was carried out based on the investigating the characteristics of the secondary sedimentation tank, the intermediate pump station and the high-density sedimentation tank. The results showed that the influent DO concentration of the deep denitrification bed filter process was decreased by about 4.4 mg/L, the utilization rate of added carbon source was decreased by 26%, the cost of carbon was reduced by about 0.078 yuan/m3, and the annual saving was over 280 000 yuan. The renovation can provide guiding significance for the similar municipal WWTPs in reducing cost as well as efficient and economic nitrogen removal.
Last Update:
2024-10-17