Basic Application Of Treatment Of Ruralwastewater In Constructed Wetland Insouthern Jiangsu

It is proposed that the rural areas in southern Jiangsu should choose the appropriate decentralized sewage treatment mode according to local conditions.In order to help the vast rural areas to solve their sewage treatment related problems,comprehensively consider the geographical and landforms,topography,soil types and climatic conditions and other factors,and adopt improved analytic hierarchy process to establish a four-tier six-tier model suitable for the characteristics of rural areas in southern Jiangsu.The index system and evaluation method of the scheme rural decentralized sewage treatment model.As an ecological sewage treatment process,constructed wetland has been combined with green landscape in urban life and has been widely used.At present,it is commonly used for the treatment of tail water quality of urban sewage plants.At this stage,due to the random discharge of rural sewage and the weak environmental awareness of residents,the current situation of rural water pollution is very serious,and the demand for decentralized treatment of rural domestic sewage is urgent.In southern Jiangsu,some villages and towns in the forefront of environmental protection plan to use ecological artificial wetlands to combine with traditional biochemical treatment devices,hoping to achieve the purpose of water pollution control and landscape display.However,limited by topography,geography,soil environment,financial subsidies,policy guidance,operation management,etc.,the utilization of constructed wetlands at this stage is facing unstable removal rate,low utilization rate,irregular operation and high idle rate issues.This article is fully investigating and studying the current situation of decentralized domestic sewage discharge and treatment in my country,focusing on the status and mode of decentralized domestic sewage treatment in rural areas in southern Jiangsu and the harm of rural water pollution to the environment.Through in-depth related analysis and research,through studying the combined process of different domestic and foreign rural domestic sewage treatment technologies and the artificial wetland of typical projects in southern Jiangsu,the process characteristics and application conditions are mastered.For those with small daily treatment water volume,below 1m³/d,it is suitable for single-door single households to use distributed artificial ecological wetland beds.The treatment facility occupies a small area and can make full use of the topographic features around the farmer’s house.It can be constructed in front of and behind the house.The construction cost is low and no routine maintenance is required.For ordinary villages with daily sewage treatment volume of 20～200m³/d,design schemes can be compared and selected according to their specific geographical,climate and economic conditions,and a reasonable underflow composite artificial ecological wetland can be designed.Secondly,taking Kejiaqiao and Beigang constructed wetlands in southern Jiangsu as examples of typical projects,the operation status of two typical constructed wetlands are analyzed,and the two constructed wetlands are focused on the removal efficiency of typical pollutants in rural sewage in typical months.The survey results show that the constructed wetland in Kejia Village and the constructed wetland in Beigang have a good removal effect on typical pollutants in rural sewage,and COD_Cr,NH₄⁺-N and TP can meet the first-level A discharge standard in a typical month.The combined ecological wetland technology that has been successfully operated in southern Jiangsu has rich experience.Through field inspections and research on design schemes,we can learn from each other and make up for shortcomings.In order to use the ecological wetland combination process to treat rural wastewater in the rural areas of southern Jiangsu,and to extend the wetland treatment to the whole country,provide operation management experience and design experience.