Investigation And Research On Zhenjiang Rural Domestic Sewage

China's rural environment pollution problems are serious,in which water pollution is particularly severe.Disordered discharge of rural life sewage is an important factor that causes rural water pollution.Under the background of constructing beautiful China,zhenjiang rural domestic wastewater was picked as the research subject.On the basis of the holistic macroscopic investigation,village sewage water was selected for monitoring and some village sewage treatment facilities were closen for processing effect monitoring,thus putting forward the preliminary recommended scheme of zhenjiang rural sewage treatment.?1?The macro survey objects included the whole villages of danyang,kogong city,yangzhong city and dantu district under the jurisdiction of zhenjiang municipality;the survey of water content consisted of 22towns?villages?of the four municipalities?districts?;the survey of water quality and treatment effect included the four municipalities?districts?and eight towns?villages?.?2?At the end of 2014,the sewage treatment rate for rural area in zhenjiang was 31.87%.Zhenjiang rural domestic sewage adopted centralized management mode except a few demonstrative villages,In downtown area,the rural sewage mainly adopted decentralized processing and part of it got access to municipal pipeline processing.The type of sewage treatment process in zhenjiang city mainly includes:physical processing technology,biological treatment process,ecological treatment process and biological+ecological combination processing technology.?3?The amount of sewage in 22 towns?villages?was calculated,and the average per capita sewage in 22towns?villages?was 141L/d per person.?4?The monitoring indexes of COD,ammonia nitrogen,total phosphorus and SS were monitored and the water quality was monitored in 8 towns?villages?.The variation range of COD concentration of sewage in eight towns?villages?was between 165mg/l-270mg/L;the range of NH₃-N concentration varied between11mg/l-51mg/L;the range of TP concentration varied between 1mg/l-5mg/L;the variation range of SS concentration was between 3mg/L-16mg/L.?5?Field monitoring of the treatment effect of rural domestic sewage in 8 towns?villages?was conducted,and the change of COD water concentration was between 48mg/l-90mg/L,and the removal rate was 62%to79%.The concentration of NH₃-N changed between 1mg/l-8mg/L,and the removal rate was 47%to 83%.The change of TP effluent concentration was between 0.2mg/l-1.1mg/L,and the removal rate was 54%to 76%.SS effluent concentration changes between 1mg/L-10mg/L,and the removal rate was 45%-64%.?6?For a recommendation from zhenjiang in rural sewage treatment research,this paper discusses the principle,general requirements,the processing method of determining the scale and scope of design in and out of the water quality indexes,putting forward sewage treatment craft adoptable to different regions of zhenjiang city,such as trickling filter+artificial wetland process,contact oxidationing+artificial wetland technology,biochemical pool A²/O process,the secondary biological contacting oxidation process,and the humus padding filter process.The paper can provide a reference for zhenjiang municipal government to formulate the policy of rural living sewage treatment and provide a reference for the rural living sewage treatment in southern small and medium-sized cities.