不同配比的猪粪便和秸秆在厌氧发酵前后Cu和Zn的形态变化

Changes in fractions of Cu and Zn in initial and final anaerobic co-digestion of pig manure and maize straw in different ratios

在中温(35±1)℃的条件下,利用新鲜猪粪和玉米秸秆按照干物质质量比为1∶1和2∶1分别进行为期50 d的厌氧发酵实验,并利用改进的BCR 3步提取和0.01 mol·L-1CaCl2提取,分别对2组配比第1天的发酵物和最后1天沼渣进行Cu和Zn各形态的提取和测定.结果表明,厌氧发酵过程均能减少2组配比发酵物Cu和Zn在沼渣中的可交换态含量和生物有效性百分含量(酸提取态和Fe-Mn氧化物结合态百分比之和),同时增加Cu和Zn在沼渣中的稳定性(有机质及硫化物结合态和残渣态百分比之和).

A 50-day anaerobic digestion test is conducted by mixing raw pig manure with maize straw at dry matter mass ratios of 1∶1 and 2∶1 at the temperature of（35±1） ℃.The fractions of Cu and Zn of the co-digestion fermentation materials and the biogas residues are measured by modified BCR extraction and 0.01 mol·L-1 CaCl2 extraction processes,respectively.The results showed that the concentrations of leachable fraction and the percentages of bioavailability（sum percentages of exchangeable and reducible fractions） of Cu and Zn all decreased in biogas residues,and the stability（sum percentages of oxidizable and residual fractions） of Cu and Zn all increased in biogas residues during anaerobic co-digestion.