Research On Rural Sewage Upgrading And Transformation And Decentralized Treatment Technology Selection In Tong’an District, Xiamen City

With the continuous promotion of the comprehensive rural revitalization work,ecological livability is key to revitalization,and ecological environment improvement and human settlement environment improvement have become the issues that need to be addressed now.Due to the late start,lack of experience,and weak rural infrastructure of domestic rural sewage treatment,rural sewage cannot be fully collected and treated.The special nature of rural domestic sewage determines that its collection and treatment technology is different from that of urban sewage collection and treatment systems,so it is necessary to choose appropriate rural domestic sewage collection and treatment technologies according to local conditions.The main focus of this article is on the improvement and decentralized treatment technology of rural domestic sewage.Based on the rural area overview and decentralized treatment facility operation in Tong’an District,research is conducted on the characteristics of rural sewage discharge,water quality and quantity,as well as the development of collection strategies and the applicability of six commonly used rural sewage treatment processes in the area.The entropy-weight-TOPSIS method is used to compare and analyze the six commonly used treatment processes in terms of technical economy,technical efficiency,social benefits,and technical performance,as well as to rank their comprehensive performance.Finally,through the research on treatment technology routes,comparative analysis is conducted on treatment routes.The main research content and results are as follows:1、Based on the field research on rural areas in Tong’an District and the study of the rural domestic sewage improvement and transformation project in the district,this research investigates the characteristics of rural domestic sewage in terms of water quality,quantity,and other factors,and analyzes the problems associated with rural sewage discharge.Finally,solutions and strategies are proposed to address the issues identified.2、According to the entropy-weight-TOPSIS method used to comprehensively evaluate the six commonly used rural domestic sewage treatment processes in Tong’an District,under the condition of unrestricted economics,their comprehensive performance rankings are as follows: multi-stage A/O + constructed wetland,composite biological filter + constructed wetland,septic tank,anaerobic + constructed wetland,stabilization pond,and constructed wetland,with the multi-stage A/O + constructed wetland process being the most applicable.Under the condition of limited economics,their comprehensive performance rankings are as follows: anaerobic + constructed wetland,composite biological filter + constructed wetland,stabilization pond,constructed wetland,multi-stage A/O + constructed wetland,and septic tank,with the anaerobic +constructed wetland process being the most applicable.3、The study of treatment technology routes compares the centralized management route,decentralized management route,and three-compartment septic tank management route through analysis of social benefits,environmental effects,and economic benefits.Based on the analysis,a suitable technology route for rural domestic sewage treatment is proposed,and the applicable conditions for the three treatment routes are compared and selected.