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规模化养猪场沼液中除了富含N、P、K等植物生长所必需的营养元素外,还含有一定数量的重金属和兽药残留等物质。目前,大多数沼液都是直接排入河流,农牧严重脱节是导致沼液直接排放的根本原因。最经济有效的解决途径是:在规模化养猪场的周围配套耕地消纳其产生的污水,从而实现零排放。要达到这个目的,必须做到适度规模养殖,确保沼液场内消纳,并开展规模化养猪场沼液利用安全性研究。
Large-scale pig farm biogas slurry in addition to N, P, K and other plant nutrients necessary for growth, but also contains a certain amount of heavy metals and veterinary drug residues and other substances. At present, most of the biogas slurry is directly discharged into the river. The serious disjunction between agriculture and animal husbandry is the fundamental reason leading to the direct discharge of biogas slurry. The most cost-effective solution is to use the arable land around large-scale pig farms to absorb the wastewater they produce and achieve zero emissions. To achieve this goal, we must do a moderate scale farming, to ensure that the biogas digestion, and to carry out large-scale use of pig farm safety research.