In order to understand the present situation of water pollution prevention and wastewater treatment of pig breeding in Sichuan,on the basis of full literature research,131 large-scale pig farms in 70 pig breeding counties in 21 cities in Sichuan Province were selected to carry out research,and the research data were used for analysis.During 2011-2021,the range of pig breeding stock in Sichuan was between 21.936 5 to 33.655 8 million.In 2019,affected by African swine fever,the stock reached the lowest.In 2021,Yibin,Nanchong and Mianyang cities had the most large-scale pig farms,while Aba,Panzhihua and Ganzi cities had the least.During 2011-2021,the center of gravity of pig breeding in Sichuan did not change significantly,and the overall development trend was to the east and south.In 2021,3.120 2 million tons of CODCr,0.291 0 million tons of total nitrogen,39 000 tons of ammonia nitrogen and 44 800 tons of total phosphorus were produced by pig breeding in Sichuan.According to the field investigation,faeces-in-water was mainly used for manure cleaning by large-scale pig breeding in Sichuan.The output of wastewater was higher in summer than in winter.The maximum concentrations of CODCr,ammonia nitrogen,total phosphorus and total nitrogen in raw water can reach 47 600 mg/L,3 280 mg/L,1 610 mg/L and 4 170 mg/L respectively.After the combined treatment of physical,biological,physicochemical and ecological processes,the wastewater was mainly returned to the field as liquid fertilizer or water resources.The wastewater from only two farms in the province was discharged indirectly,and the treated wastewater from other farms was returned to the field for use.The prevention and control of water pollution in pig breeding in Sichuan is generally good,and the treated wastewater is mainly returned to the field,and the advanced treatment and discharge of wastewater are stillin the exploratory stage.
pig breedingwater pollution controlwastewater treatmentSichuan Province
NETL
NSTL
万方数据
维普
