蒙脱石对污泥好氧堆肥过程中重金属钝化效果

发布时间：2018-03-22 02:23

  本文选题：堆肥　切入点：重金属　出处：《矿物学报》2017年Z1期 　论文类型：期刊论文

【摘要】：污泥中重金属污染是影响污泥资源化利用的重要因素,而重金属的迁移性直接决定了堆肥产品的生物安全性。为研究蒙脱石对堆肥过程中重金属钝化效果及腐熟度的影响,实验以菌菇渣和猪粪为调理剂,蒙脱石为钝化剂,进行脱水污泥高温好氧堆肥。结果表明,不含钝化剂的堆肥过程中,Cu和Pb的可交换态含量增加,迁移性增强;而添加蒙脱石的堆肥化能有效抑制重金属的活化,当钝化剂的添加量为7.5%时钝化效果最好,对Cu、Pb和Zn的钝化效果分别为30.6%、38.3%和19.6%。同时,添加蒙脱石可使堆体的高温期(50℃)维持6 d,最高温度达65℃,种子发芽指数达90%以上,堆体完全腐熟,达到堆肥无害化标准。
[Abstract]:The pollution of heavy metals in sludge is an important factor affecting the utilization of sludge resources, and the migration of heavy metals directly determines the biological safety of compost products. In order to study the effects of montmorillonite on the passivation effect and maturity of heavy metals in composting process, Using mushroom residue and pig dung as conditioning agent and montmorillonite as passivating agent, high temperature aerobic composting of dewatered sludge was carried out. The results showed that the exchangeable content of Cu and Pb in the compost without passivating agent was increased and the mobility was enhanced. However, the composting of montmorillonite can effectively inhibit the activation of heavy metals. When the amount of passivating agent is 7.5, the passivation effect is the best, and the passivation effect for Cu _ (2 +) Pb and Zn is 38.3% and 19.6%, respectively. The addition of montmorillonite can keep the heaps at 50 鈩，

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