Study Of Performance And Rural Regional Adaptability Of New Integrated Sewage Treatment Equipment

The"Thirteenth Five-Year Plan"put forward the historical task of"around the integration of urban and rural development,and promoting the new rural construction".It also pointed out that it is necessary to increase the intensity of rural sewage treatment and toilet reform,and comprehensively promote the renovation of rural human settlements.Rural areas have low economic levels and poor infrastructure,and there is no perfect drainage network and sewage treatment equipment.As a result,a great deal of sewage flows into the nearby water body directly,causing deterioration of the water environment and posing a great threat to the production and life of rural residents.At present,there are many types of decentralized treatment processes suitable for treating rural sewage,but most of the processes have limitations.Aiming at the situation of rural sewage in China,the decentralized integrated sewage treatment equipment with convenient management,stable operation,high water quality and low investment cost is of great significance for the efficient removal of rural sewage.Rural sewage has the characteristics of small amount and dispersion,low emission coefficient,strong biodegradability and intermittent discharge.In response to these characteristics,this study developed a new integrated rural sewage treatment device based on the MSBR process,which combines the A²/O process and the SBR process to achieve the treatment requirements for high efficiency intensification.Based on the characteristics of large fluctuations of rural sewage water volume,the operation effect of integrated equipment under changing conditions of influent flow rate is studied in order to investigate the water-resistant load impact capability of equipment.The results show that the integrated device can stably and effectively remove COD,NH₄⁺-N,TN and TP,and the removal rates can reach 95%,94%,84%,89%,respectively.Moreover,a certain degree of short-range nitrification and denitrification occurred in the aerobic tank of the integrated equipment during the change of the influent flow rate,which is the reason for the improvement of the denitrification performance of the device.In order to study the adaptability of equipment under the intermittent discharge of rural sewage,the equipment was operated for 30 days under the conditions of continuous water inlet and intermittent water inlet,respectively.The results indicate that the integrated equipment has stable and efficient treatment effects under both working conditions.The effluent COD,NH₄⁺-N,TN mass concentration meets the first-class A standard,and the effluent TP mass concentration meets the first-class B standard.As well as,in the intermittent water inlet mode,the high-quality carbon source available in the equipment is increased,so the denitrification performance of the system is improved and the nitrogen removal efficiency is increased.Aiming at the large temperature difference between winter and summer in the north,the treatment effect of equipment at low temperature was studied.The results show that the removal rate of COD,NH₄⁺-N,TN and TP decreased by 3%,6.4%,5.5%and 1.4%in the winter.However,there is still good removal effects and stable compliance.In this study,the performance optimization of integrated equipment was also carried out by means of point-in-water.The results suggest that the optimal water inflow ratio is Q _pre:Q _ana=0.2:1.0.At this time,the removal efficiency of COD,TN,and TP was 93%,74%,and 92%,and the average effluent concentration was 25.24mg/L,10.91 mg/L,and 0.60 mg/L,respectively.Based on the optimal conditions,the operation cost and corrosion resistance of the equipment are calculated and evaluated,and the average treatment cost per ton of water was 0.77 yuan.The equipment has certain corrosion resistance.