Analysis Of Pollution Sources Of Rural Water Environment And Research On Harmless Treatment

The treatment of organic waste in rural areas has always been a pain point and difficulty in the treatment of rural ecological environment,especially the influence of waste straw on water environment is extremely serious.Through investigation,this paper learned that the water environment in the study area was seriously polluted,and analyzed that the main pollution source was planting source pollution,and conducted earthworm overbelly conversion and sunroom high temperature heap rot experiments,to explore the change of physical and chemical properties of compost products after earthworm overbelly conversion of cow dung straw,as well as the growth of earthworm.At the same time,the change of physicochemical properties of pollutants in the process of straw pile rot was also investigated.(1)Through the analysis of the water environment in the Helan Section of the Third Drainage Ditch in Yinchuan,Ningxia Hui Autonomous Region,the sources of pollutants in the study area are mainly divided into four categories:planting source pollution(mainly waste straw),livestock and poultry manure pollution,aquaculture pollution and domestic source pollution.According to the calculation,in terms of planting sources,the annual COD production is 421.1 1t/a,and the drainage amount is 86.34t/a.The yield of ammonia nitrogen was 63.16t/a,and the drain yield was 14.25t/a.The yield of TP was 53.43t/a and the gully yield was 1.63t/a.In terms of livestock and poultry manure pollution,the annual COD,ammonia nitrogen and TP into the ditch are 141.28t/a,16t/a and 3.75t/a.In terms of the discharge of domestic sewage,the annual COD production is 380t/a,and the discharge is 40t/a.The yield of ammonia nitrogen was 54t/a,and the drainage was 5.4t/a.The yield of TP was 9.57t/a and the gully yield was 0.97t/a.In aquaculture,the amount of COD,ammonia and TP into the ditch is 53.11t/a,1.90t/a and 4.26t/a.The main source of COD pollution is the planting source pollution.Ammonia nitrogen pollution also comes from planting source pollution,and TP pollution mainly comes from manure produced by livestock.Therefore,the improvement of water environment should start from planting source pollution and manure pollution of livestock and poultry to achieve source control.(2)Corn straw and cow manure were used in the sun room in a ratio of 3:1,2:1 and 1:1.The results showed that the ratio of 3:1 and 2:1 in the pile was better,and the changes of temperature,pH,moisture content,organic matter and TN were very regular,while the changes of P and K in the pile were little.(3)The growth and propagation of earthworm were significantly affected by different base combination.Cooked cow manure compared to fresh cow manure and cow manure plus Straw combination was more suitable for the growth and propagation of earthworms.The average body weight of earthworms increased in the process of earthworm culture.The growth and reproduction of earthworms were relatively better when cow manure was fermented.The average body weight of earthworms increased by 67.94mg after cow manure fermentation compared with that without fermentation.The average body weight of earthworms slowed down after straw was added.These results indicated that cooked cow dung was more suitable for earthworm breeding,and the palatability of cow dung to earthworm could be improved after fermentation.(4)Effects of raw cow manure,cooked cow manure,mixed pile rot of corn straw and cow manure,four different base materials on the growth and reproduction of earthworm and compost product nutrients.It was found that composting by inoculating earthworms could significantly increase the content of total nitrogen and total phosphorus,improve the nutrients of compost products,and convert cow manure and straw into high-quality organic fertilizer.In conclusion,the above two harmless treatment methods can improve the nutrient composition in the reactor and increase the content of nitrogen,phosphorus and potassium in the reactor.Therefore,the two harmless treatment modes can not only transform cow manure and straw into high-quality organic fertilizer,but also improve the treatment of traditional rural organic waste,so as to achieve the source control and resource utilization of rural organic waste.