Research On Applicability Decentralized Rural Sewage Treatment Technology In Doumen District

With the rapid development of my country’s economy and the improvement of the quality of life in rural areas,the discharge of domestic sewage is also increasing day by day.Due to the late start of rural sewage treatment,lack of experience,and weak rural economy,the problem of pollution of the rural water environment is still prominent.In practical engineering applications,due to the unique characteristics of the basic rural conditions in different regions,the overall performance of different rural sewage treatment technologies is uneven.The unscientific selection of rural sewage treatment technology makes it difficult to guarantee the stable and long-term operation of rural sewage treatment facilities in areas with weak economic strength and operational management.Therefore,it is particularly important to select the rural sewage treatment technology suitable for the target area.Based on the general situation of rural areas in Doumen District and the operation status of rural sewage treatment facilities,this thesis conducts research on the characteristics of rural sewage discharge,water quality and quantity,and the applicability of five rural sewage treatment technologies commonly used in Doumen District.Using the analytic hierarchy process,entropy method,and entropy weight-TOPSIS comprehensive evaluation calculation method,the comprehensive performance of the five commonly used rural domestic sewage treatment technologies in Doumen District is carried out from the four aspects of economic benefits,technical stability,social benefits,and operation management.Calculate and sort.Finally,through actual renovation project cases,the applicability of the ecological oxidation pond technology in the practical application of rural domestic sewage treatment in Doumen District was objectively evaluated.The main conclusions are as follows:The application situation of domestic and foreign rural sewage treatment technology was studied,and the operation status of the sewage treatment system in Doumengo rural area was investigated,and the characteristics of rural sewage discharge,water quality and quantity were generally grasped.What’s more,the advantages and disadvantages of the five indicators of rural sewage treatment technology commonly used in Doumen district in practical engineering application are comparedBy subjective and objective weighting method,entropy TOPSIS comprehensive evaluation method to calculate the calculation of five kinds of wastewater treatment technology,under the condition of land resources is not restricted,its comprehensive performance to include:the artificial wetland>RPIR integration of sewage treatment facilities MBR integration of sewage treatment facilities>high load biological filter>A~2O integration of sewage treatment facilities,artificial wetland high applicability.Under the condition of limited land resources,its comprehensive performance is ranked as follows:RPIR integrated sewage treatment facility>MBR integrated sewage treatment facility>constructed wetland>A~2O integrated sewage treatment facility>high load biological filter>RPIR integrated sewage treatment facility has high applicability.Taking a sewage treatment station in Doumen District as the practice point of reconstruction project,the ecological oxidation pond technology was selected according to local conditions.The effect comparison before and after the engineering renovation shows that the comprehensive performance of the ecological oxidation pond technology is good,and the removal rates of COD,BOD5,ammonia nitrogen and total phosphorus are 80.90%,90.20%,95.42%and 82.52%,respectively,after long-term operation.Low operation and management cost,about 0.83 yuan/ton of water;It is less difficult to manage,and has high landscape benefits and social benefits,with vegetation coverage rate of 70%.The technology is suitable for sewage treatment in rural areas where land resources are not limited in Doumen district,which not only accords with the regional status quo of weak economy and weak operation and management level in Doumen district,but also accords with the requirements of"beautiful village construction".