Simulation and application of process optimization for urban wastewater treatment plants in environmentally sensitive area
This study focused on the challenges faced by municipal wastewater treatment plants in sensitive areas to meet stringent effluent discharge standards.Site investigations revealed that the existing process suffered from problems such as excessively high MLSS,aeration rate,DO and low external recycle ratio.An improved AAO process model for the plant was constructed using wastewater treatment simulation software.After calibration and verification,the effects of different process parameters on effluent quality were investigated.The results showed that increasing the sludge discharge rate to reduce the MLSS in the biological tank to about 5000 mg·L-1,simultaneously reducing the aeration rate to control DO to 1 mg·L-1,and appropriately increasing the external recycle ratio were effective measures.After implementing the optimized scheme,the actual effluent COD and TN concentrations at the WWTP decreased by 7.8％and 22.5％,respectively,while the dosages of PAC and PAM for phosphorus removal decreased by 20％and 11.5％,respectively.
improved AAO processprocess simulationnitrogen and phosphorus removaloptimized operationenergy conservation and consumption reduction
万方数据
维普
