河北省承德市1998年春,在全市实施了建暖棚养畜、建沼气池、用畜禽粪便产沼气、再将沼渣沼液用于种植业的“三位一体”养畜工程。并作为农业技术推广项目进行推广。一年来,发展三位一体工程户达36847户,仅承德、宽城两县用暖棚养畜禽就达16万头(只),用沼液浸种种地600公顷,收到了较好效果。 Chengde City, Hebei Province, the spring of 1998, in the city to implement the greenhouse heating livestock, biogas digesters, livestock and poultry manure biogas production, biogas slurry and then used for planting the “Trinity” livestock project. And promote agricultural technology promotion projects. In the past year, there were 36,847 Trinity project developers, with only 160,000 (only) warm livestock poultry raised in Chengde and Kuancheng counties. Only 600 hectares were planted with biogas slurry and received good results.