| According to the survey,the current rural sewage problem has seriously affected the quality of life of the residents of villages and towns,involving the residents of the region’s life happiness index was declining trend,which will directly affect the current harmonious society development blueprint,contrary to the new rural construction The As the rural domestic sewage contains nitrogen and phosphorus and other nutrients and a large number of pathogenic microorganisms,untreated domestic sewage direct discharge,the lack of a unified sewage treatment system,will cause water eutrophication,a typical example is 2008 Qingdao Enteromorpha outbreak events,as well as Yunnan Dianchi Lake and Anhui Chaohu blooms phenomenon.Even directly lead to drinking water safety issues.In recent years,more and more villages and towns environmental complaints and water pollution problems plagued the daily life of the people,village sewage problems need to be resolved.Since the reform and opening up,China’s urbanization with the economic development continues to increase,more and more people from the rural flock to the city(town),to promote urban(town)economic development.Making the number of villages and towns from 1978 to 2178 to nearly now more than 48,000.With the accelerated process of urbanization and the continuous development of economy and society,the water environment of villages and towns is also facing serious pollution.Now the widespread existence of municipal infrastructure construction can not keep up the pace of economic development,resulting in villages and towns sewage does not have a systematic collection and treatment facilities,sewage directly into the nearby water,so that the river water pollution increased,as the source of drinking water To the less,water pollution load increased,there have been serious water pollution.In order to avoid the "first pollution,after the governance" of the old road,with the completion of China’s sustainable development strategy,we have to develop suitable for small and medium-sized villages and towns of sewage treatment process,so that small and medium-sized villages and towns residents can obtain safe water to ensure that industrial agriculture Domestic water,and sewage treatment to meet the requirements of national standards.This paper describes the research background and significance of this project,and summarizes the current research situation of domestic and foreign sewage treatment in villages and towns and the research contents and research methods of this paper.As well as innovation.The main contents of the village of sewage treatment in detail the theoretical basis for the town of Dashi Township Township Township Township Township,the town of geography,villages and towns,natural conditions,water supply and drainage status,water environment issues were analyzed in detail,and then further for this project The design scope,the scale of the project construction and the water quality of the project villages and towns were analyzed.The amount of sewage used is estimated to be 200 m3 / d.According to the actual water quality standard of Henan Province,the water quality of the sewage treatment is CODcr≤380 mg / L,BOD5≤180 mg / L,SS≤200 mg / L,NH3-N≤25 mg / L,TN≤40 mg / L.Combined with the local weather,topography,geomorphology and other projects and the overall planning of the village,to determine the candidate site of the sewage treatment plant.The biochemical treatment of domestic sewage and artificial wetland treatment and other methods to carry out a wide range of advantages and disadvantages,through economic and technological,operation and maintenance and treatment effects and other aspects of comprehensive comparison,to meet the Kaifeng City Environmental Protection Bureau,"urban sewage treatment plant pollutants Emission standards "(GB18918-2002)level B of the standard water quality requirements,the water plant technology to determine the final A / O process + horizontal subsurface flow constructed wetland processing system.The process flow for the grid → collecting pool → anoxic tank → aerobic tank → secondary sediment pool → artificial wetlands → standard discharge or reuse treatment,the sludge generated through the sludge or through the sludge condensate pool Sinotrans or Composting.After this paper,through the sewage treatment scale and the hourly flow of sewage,the water treatment unit structure of this process has been initially calculated and selected and the general design is designed.The water quality of the drainage is analyzed and analyzed.Finally,the economic benefit analysis after the investment operation of the project is introduced,and the convenience of the selected technology is demonstrated.It is hoped that through the successful implementation of the research project,it will provide reference for the domestic sewage treatment in other villages and towns in Henan Province. |
