JAUE2012-074: Analysis of water temperature variation characteristics of urban sewage treatment plant in cold region

Abstract

It takes an actual operation of large urban sewage treatment for example which located in the cold regions of northern China in Changchun city, through field measurement, analysis and discusses water temperature variation characteristics of urban sewage treatment plant in cold region. The results shows that despite the serve air temperature changes, the water temperature of sewage treatment plant has a small changes, the lowest water temperature maintains at above 10°C, and analysis the main reasons that why water temperature is higher than air temperature. Compare the accuracy of two temperature mathematical models by the least square method, indicating that the accuracy of the nonlinear model is higher than the linear model. The inlet water temperature, aeration water temperature and outlet water temperature of sewage treatment has little difference, the aeration temperature is slightly higher than the inlet, outlet temperature, the sewage treatment in cold regions should adopt diffused aeration system.