不同辅料配比对城市污泥堆肥效果及重金属形态转化的影响

发布时间：2018-09-07 13:25

【摘要】：采用高温好氧堆肥工艺,研究蘑菇渣、废白土为辅料的不同配比对城市污泥堆肥效果的影响。通过测定堆肥过程中温度、含水率、pH值、电导率、有机质含量、总氮含量、总磷含量、总钾含量、种子发芽率、重金属含量以及重金属各形态分布等指标,在确保堆肥产品达到安全农用要求的前提下,探讨不同辅料配比对污泥堆肥中重金属迁移转化的影响。结果表明,经过26 d的堆肥,各处理的污泥均达到腐熟程度,有机质含量、总养分含量、种子发芽率及重金属含量均符合园林绿化用泥质和农用泥质的各项指标;不同辅料配比对污泥堆肥效果影响明显,重金属镉(Cd)、锌(Zn)、铜(Cu)、铅(Pb)的形态分布总体上呈易迁移态向难迁移态转化,堆肥过程对Zn、Cu的形态转化影响最明显,其中以处理C(污泥∶蘑菇渣∶废白土=12∶10∶3)对污泥堆肥中重金属钝化的处理效果最佳。
[Abstract]:The effect of different ratio of mushroom residue and waste clay on the composting effect of municipal sludge was studied by aerobic composting process at high temperature. Temperature, water content, pH value, electrical conductivity, organic matter content, total nitrogen content, total phosphorus content, total potassium content, seed germination rate, heavy metal content and distribution of heavy metals were measured during composting. On the premise of ensuring the composting products to meet the requirements of safe agriculture, the effects of different ratios of auxiliary materials on the transfer and transformation of heavy metals in sludge compost were discussed. The results showed that after 26 days of composting, the sludge reached the degree of decay, organic matter content, total nutrient content, seed germination rate and heavy metal content all accord with the indexes of mud and agricultural mud for garden greening. The effects of different ratio of auxiliary materials on sludge composting were obvious. The speciation distribution of heavy metal cadmium, (Cd), zinc, (Zn), copper, (Cu), lead (Pb) was easy to migrate to difficult to migrate, and the composting process had the most obvious influence on the form transformation of Zn,Cu. Among them, C (sludge: mushroom residue: waste clay 12: 10: 3) was the best for heavy metal passivation in sludge compost.
【作者单位】：华南农业大学资源环境学院;环境保护部华南环境科学研究所;东莞市圣茵城市景观农业工程研究中心;
【基金】：广东省东莞市科技计划(编号:2013108101037) 广东省广州市科技计划(编号:2014Y2-00523)
【分类号】：X703;S141.4

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