Research On Change Trend Of Influent And Effluent And Removal Efficiency Of Pollutants Of Loushan River Wastewater Treatment Plant

Loushan river wastewater treatment plant initially uesd multiple-influent reversed A/A/O process, after the upgrading project, now use the process named "optimized anaerobic+multistage anoxic-aerobic"(OAMSAO process, based on the MUCT process), the effluent quality meets the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). By analyzing annual monitoring data of the wastewater treatment plant and studying the change trend of effluent quality and removal efficiency, it can provide a reference for the stable running of municipal wastewater treatment plant.The research content mainly includes: integrated with serviced area of Loushan river sewage treatment plant, analyze the monthly and seasonal changes and reasons for influent quantity and quality of wastewater treatment plant, expound the change trend and main influencing factors of influent water quantity and quality; analyze effluent quality of wastewater treatment plant and removal efficiency of pollutants, discuss operating characteristics and treatment of wastewater treatment plant; analyze the monthly and seasonal changes and reasons for effluent quality and removal efficiency of wastewater treatment plant, expound the change trend and main influencing factors of removal efficiency of pollutants.Through the calculation of annual monitoring data of Loushan river wastewater treatment plant from October2011to September2012, the results are as follows:1. Influent temperature changes with the seasons, shows the same change trend.2. Influent quantity is closely related to changes of industrial wastewater, domestic sewage and rainfall, is influenced by all the three factors.3. Influent COD, SS, TN, NH3-N and TP are influenced by changes in rainfall to a certain extent. Influent BOD5has no correlation with other indexes, shows its own change trend. Influent COD, BOD5and SS change greatly in the year, influent TN、 NH3-N and TP change little in comparison. The low concentration of influent BOD5result in poor biodegradability and low carbon-nitrogen ratio.4. The discharge standard rate of effluent quality is close to100%, it has a good effect on treating various pollutants, Loushan river wastewater treatment plant runs smoothly.5. Effluent COD, BOD5, SS and TP have a certain correlation with influent indexes, show the similar tendency. Effluent TN has no obvious correlation with influent TN. Along with change of influent TN, effluent TN changes little in the year. The concentration of effluent NH3-N is influenced by removal rate, and can not be stable in a certain range. Loushan river wastewater treatment plant has high removal rate of COD, BOD5and SS, and can be stable in a certain range, but the removal rate of TN, NH3-N and TP change greatly in the year and can not be stable in a certain range.