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为研究猪粪堆肥中铜锌与腐殖质组分的结合竞争,以猪粪和秸秆为堆腐原料,进行了为期36 d的好氧堆肥实验,研究猪粪堆肥过程中腐殖质组分(胡敏酸和富里酸)、胡敏酸结合态铜锌、富里酸结合态铜锌含量的变化。结果表明,堆肥结束后,腐殖化程度提高,胡敏酸碳含量增加394.4%,富里酸碳含量降低64.9%,腐殖化指数从0.24增加到3.33;随着堆肥的进行,胡敏酸结合态铜锌含量分别增加394.3%和56%,而富里酸结合态铜锌含量分别下降17.5%和28.4%;相关分析表明,胡敏酸结合态铜、富里酸结合态锌与胡敏酸、富里酸碳含量及腐殖化指数均成显著相关(P<0.01);堆肥过程中,胡敏酸结合态铜与富里酸结合态铜之比大于1,而胡敏酸结合态锌与富里酸结合态锌小于1,另外,胡敏酸中的Cu/Zn大于1,而富里酸中的Cu/Zn小于1,表明在腐殖质中铜主要与胡敏酸结合,而锌主要与富里酸结合。研究揭示了猪粪堆肥中重金属铜锌与不同腐殖质组分的结合竞争关系,为畜禽粪便堆肥土地利用的风险评估和风险控制提供科学依据。
In order to study the combined competition of copper, zinc and humus components in pig manure composting, pig manure and straw were used as raw materials for composting for 36 days aerobic composting. The humic components (humic acid And fulvic acid), humic acid bound copper and zinc, fulvic acid bound copper and zinc content changes. The results showed that after composting, the degree of humification increased, the content of humic acid increased by 394.4%, the fulvic acid content decreased by 64.9% and the humification index increased from 0.24 to 3.33. With the compost, humic acid combined State copper and zinc contents increased by 394.3% and 56% respectively, while those of fulvic acid-bound copper and zinc decreased by 17.5% and 28.4% respectively. Correlation analysis showed that humic acid bound copper, fulvic acid bound zinc and humic acid, (P <0.01). During composting, the ratio of humic acid-bound copper to fulvic acid-bound copper was greater than 1, while humic acid-bound zinc combined with fulvic acid Zinc is less than 1, and Cu / Zn in humic acid is greater than 1, while Cu / Zn in fulvic acid is less than 1, indicating that copper is primarily bound to humic acid in humus while zinc is predominantly associated with fulvic acid. The research revealed the binding competition between heavy metals and copper and zinc in pig manure composting and different humus components, and provided a scientific basis for risk assessment and risk control of manure composting land use.