随着传统养猪业向现代养猪业的转变,饲养规模不断扩大,生产方式发生变化,在养猪业发展中出现了许多新情况,产生了许多新问题,面临许多新挑战。一方面,由于种植业大量施用化肥代替传统有机肥,养殖业与种植业分离的程度愈来愈大,原有的大农业内部物质能量循环转化的路径被破坏,养猪业废弃物无害化处理滞后,导致养猪业环境污染问题日益突出,危害严重;另一方面,农村养猪场规模小、布局分散,给养猪业废弃物的处理和集中治理带来了较大难 With the change of traditional pig industry to the modern pig industry, the scale of raising keeps growing and the mode of production has changed. Many new situations have emerged in the development of pig industry, resulting in many new problems and many new challenges. On the one hand, due to the large amount of chemical fertilizers used in planting industry instead of traditional organic fertilizers, the degree of separation between aquaculture and planting industry is getting larger and larger. The original path of material energy recycling in large-scale agriculture is destroyed and the pig waste is not decontaminated The lag in handling, resulting in pig raising industry environmental pollution problems have become increasingly prominent, serious harm; the other hand, the size of rural pig farms, decentralized layout, to the pig industry waste disposal and centralized management has brought greater difficulty