Study On Pollution Of Livestock Manure In Gansu Province Of 2005?2014

With the development of China's economy,the living standard of residents has been continuously improved,and the consumption structure of residents has changed significantly.The demand for meat and poultry products such as meat,milk and eggs has been increasing rapidly,and the rapid development of livestock and poultry breeding industry has been promoted.With the development of livestock and poultry breeding industry,all kinds of livestock and poultry waste production surge,especially livestock and poultry manure pollution,has become an important source of environmental pollution in rural areas.Based on the current research situation of livestock and poultry breeding pollution at home and abroad,this paper analyzes the present situation of livestock fecal pollution in Gansu Province,combinating with the situation of livestock breeding in 14 cities of Gansu Province from 2005 to 2014,and discussed the effects of livestock manure on soil and The impact of the water,the future of the breeding space was predicted,and finally put forward the corresponding pollution control measures.The main research results are as follows:?1?From 2005 to 2014,the nitrogen load and phosphorus load of livestock manure in Gansu Province showed an overall trend of growth.The nitrogen load and phosphorus load of livestock manure increased from 194.43 kg/hm² in 2005 to232.55kg/hm² in 2014?nitrogen load limit of 170kg/hm²?.Phosphorus load increased from 44.65kg/hm²in 2005 to 52.06 kg/hm²in 2014?phosphorus load limit of35kg/hm²?,Gansu's nitrogen load and phosphorus load has exceeded the limit,causing pollution to the environment.From the situation of 14 cities and counties,Gannan,Jiayuguan,Wuwei,Zhangye,Jiuquan and Linxia 6 cities exceeded the nitrogen load and phosphorus load limit.?2?From 2005 to 2014,the discharge of pollutants in various livestock feces in14 cities in Gansu Province was relatively large,and the overall trend was increasing year by year.In 2005,the total amount of pollutants discharged from livestock manure pollutants was 163469.23t,and the equivalent pollutant emissions in 2014 were187731.05t.Among the three livestock fecal pollutants,the influence of water environment was TN,TP and COD,The proportions were 69.08%,25.68%and5.24%respectively.From the impact of different livestock on the water,cattle on the water was the most affected,accounting for 69.15%of the total;Sheep pollutants and other standard discharge the smallest,accounting for 2.58%of the total.From the perspective of different livestock faeces to analyze the impact of water,the highest rate of bovine urine,accounting for 55.67%;the smallest is pig manure,the share of0.29%.?3?Gansu Province,the city's livestock fecal pollution imbalance.In the past ten years,lanzhou has had a?grade pollution alert,no threat to the environment;Jinchang,Baiyin,Dingxi,Qingyang,Pingliang,Tianshui,Longnan to grade II,there was a little threat to the environment;Jiuquan,Jiayuguan,Zhangye,Wuwei,Linxia to?Level,the threat to the environment at a more serious level;Gannan early warning value has reached?level,the threat to the environment at a very serious level.?4?According to the current growth rate of livestock,the number of livestock in2014 as the starting point to pig breeding standards,Dingxi can also develop more than 10 million,Qingyang,Baiyin,Tianshui and Lanzhou can also develop more than five million.