Analysis and Treatment Technology of Non-point Source Pollution in Small Watershed of Yingshan County
In order to comprehensively control the non-point source pollution in the small watershed of Yingshan County and protect the excellent water quality of Bailian River Reservoir,through monitoring and investigating the non-point source pollution in the small watershed of Yingshan County,the whole process control method of"farmland source reduction,agricultural waste recycling,nitrogen and phosphorus loss process interception,and safe discharge into the river"has been adopted to effectively control the non-point source pollution in the small watershed of Yingshan County.The results show that,after the treatment,the use of chemical fertilizer and pesti-cide in Yingshan County has been greatly reduced.The amount of chemical fertilizer in 2023 has been reduced by 93t(1.81%)compared with that in 2022,and the application intensity is 276.8 kg/hm2;the amount of pesticide has been reduced by 4.16t(2.24%)compared with that in 2022,and the application intensity is 9.95 kg/hm2.The outlet pH of rural domestic sewage treatment facilities is 6～9.The discharge values of chemical oxygen demand(CODCr),ammonia nitrogen(NH3-N),total nitrogen(TN)and total phosphorus(TP)are lower than the standards of 60,8,20 and 1mg/L,respectively.Non-point source pollution in small watershed of Yingshan County is mainly agricultural non-point source pollution and village non-point source pollution.It is necessary to start with source prevention and control,cleaning production process and comprehensive treatment at the end,reduce the types and quantities of point source pollutants discharged,coordinate the promotion of factor governance and regional gov-ernance,as well as restore and improve agricultural ecological functions.Therefore,the value transformation from"lucid waters and lush mountains"to"valuable assets"can be realized.
small watershedagricultural non-point source pollutioninfluencing factorstreatment technology
NETL
NSTL
万方数据
