长沙天华养殖场占地２４． ６４ ｈｍ２，常年存栏猪 ３ ５００～ ５ ０００头，养鸡 ２．５万羽，粪便污水年排放量高达２４ ５００ ｍ３，畜禽粪便的污染问题十分突出。经过反复论证，并遵循保护环境，趋利避害和资源综合利用的原则，湖南省农村能源技术推广站在养殖场成功地 Changsha Tianhua farm covers an area of ​​24. 64 hm2, 3500-5000 heads of pigs are kept all the year round, 25000 chickens are raised, annual effluent of excrement is as high as 24 500 m3, and the pollution of livestock manure is very serious. After repeated demonstration, and follow the principle of protecting the environment, avoiding disadvantages and comprehensive utilization of resources, Hunan Province Rural Energy Technology Extension Station in the farms successfully