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随着配合饲料养殖法的应用,畜禽粪便中重金属含量增加。畜禽粪便经沼气发酵重金属含量如何变化,国内外少有研究。因此,该试验研究不同pH值和原料配比条件下,猪粪和玉米秸秆混合厌氧发酵后沼渣沼液中重金属的含量变化,旨在评估其作为肥料的安全性。试验结果表明,在不同pH值及原料配比的条件下,沼渣中除各Zn外,其它重金属Cr,Cu,As,Cd,Pb含量均高于其在沼液中的含量;发酵后沼肥(沼渣+沼液)中重金属除Pb外,Cr,Cu,Zn,As,Cd含量均低于发酵前发酵原料中各重金属含量;通过与NY/T798-2004复合微生物肥料产品无害化指标的比较,沼肥中重金属Cr,Cu,Zn,As,Cd,Pb含量均低于有机肥料中重金属的限量值,因此将发酵后的沼肥作为有机肥施用是安全的。
With the application of compound feed farming, livestock and poultry manure in heavy metal content increased. Livestock manure biogas fermentation heavy metal content how to change, few studies at home and abroad. Therefore, under different pH values and raw material ratio, this experiment studied the change of heavy metal content in biogas slurry of pig manure and corn stover after anaerobic fermentation, in order to evaluate its safety as fertilizer. The results showed that the contents of Cr, Cu, As, Cd and Pb in the biogas residue were higher than those in the biogas slurry at different pH values and raw material ratios. After fermentation The contents of Cr, Cu, Zn, As and Cd in heavy metals (biogas slurry and biogas slurry) were lower than those of the fermentative feedstock before fermentation except for Pb. Through the detoxification with NY / T798-2004 compound microbial fertilizer products Compared with the index, the contents of Cr, Cu, Zn, As, Cd and Pb in heavy metals in biogas manure are lower than the limit values of heavy metals in organic manure. Therefore, it is safe to use fermented manure as organic manure.