Investigation And Analysis On The Present Situation Of Domestic Sewage Treatment In Rural Areas Of Jiangsu Province

This work takes Jiangsu Province as the research object.A total of 285 rural domestic sewage treatment facilities were investigated and summarized about their commonly used treatment processes and both the advantages and disadvantages of different processes.For the purpose of futher study,seven typically representative facilities were selected to compare and analyze the treatment process,inlet and outlet water quality,and operation and maintenance management mode.The advantages and disadvantages and adaptability of different technological processes were summarized to provide references for the optimization of sewage treatment processes in different villages of Jiangsu.Finally,the operation and maintenance modes of rural domestic sewage treatment facilities were comprehensively sorted out,the effects of various modes were analyzed and evaluated,and policy recommendations were put forward.This article draws several conclusions:(1)Of the 285 rural sewage treatment facilities investigated,biotechnology accounted for 48.5%,ecological technology for 3.6%and bio-ecological combination technology for 47.9%.(2)In the analysis of effluent water quality of 7 typical facilities,the comprehensive pollutant index P value is used The calculated P values are:contact oxidation+constructed wetland technology is 0.25,biofilter+constructed wetland is 0.32,A2/O is 0.36,contact oxidation a/O is 0.6,high-load underground infiltration is 0.65 Thus,it can be seen that bioecological combination technology performs best in comprehensive pollutant treatment effect.(3)According to the typical facility pollutant removal rate,the comprehensive pollutant index and the actual operation situation,the suitable scope of each kind of treatment craft is obtained:The biological treatment technology treatment effect is stable,but the construction and the operation cost are high,and the operation and management is relatively complex,in the case study mainly used in large-scale treatment,water quality requirements,economic strength of the region,generally used in the town level of the Sewage Treatment,recommended the use of A2/O process;The ecological treatment technology has low operating cost and simple transportation management,and is mainly used in areas with rich land resources,low sewage inflow concentration,low economic strength and lack of professional operation and management personnel It can also beautify the landscape,but the treatment effect of the constructed wetland and other processes is greatly affected by the weather,the removal rate of N and P is low,and the high-load underground infiltration process is promoted It is a common process for village sewage treatment,mainly according to local conditions,choosing the appropriate combination of biological and ecological units,giving full play to their respective advantages,and achieving better practicability and pollution control effect It can be used not only to remove COD and suspended matter,but also to control nitrogen and phosphorus,and the area of land is abundant.The technology of biofilter and constructed wetland has good application effect.(4)While building rural domestic sewage treatment facilities,all localities have to effectively strengthen the operation,maintenance and management of facilities,to establish a sustainable and long-term operation and maintenance mechanism to ensure the continuous and stable operation of the facilities and discharge of wastewater up to standard.By analyzing the advantages and disadvantages of four modes of waste water management in rural areas,it is concluded that the township/village management mode is characterized by low operation cost and simple management.However,due to the lack of government financial resources and the lack of professional management and protection personnel,the actual supervision is difficult to put in place,and there are many drawbacks.The joint management mode of various departments has enhanced the professionalism of supervision and relieved the financial difficulties,but there are still unclear responsibilities and departments.The integration model of urban and rural water management has sufficient funds and professional personnel,but the operation cost is high;the third-party operation model adopts market mechanism to manage with high level of specialization and good governance effect,yet it needs to strengthen government supervision and assessment,and requires strong financial investment.