The influence of composting and maturation processes on the heavy-metal extractability from some organic wastes

C. García, T. Hernández, F. Costa
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引用次数: 68

Abstract

Seven mixtures from four organic residues—aerobic sewage sludge, city refuse, peat residue and grape debris—were made up to study the influence of the composting and maturation processes on the extractability of Fe, Cu, Ni, Zn, Cd, Pb, Cr and Mn by a chelating agent (diethylenetriaminepentaacetic acid, DTPA) and a neutral salt solution (0·05m CaCl2) from the residues.

Composting and maturation increased the concentration of heavy metals in the materials due to the loss of weight of the materials during these processes. The metals also became more insoluble, and extractants employed removed larger amounts of metals from the raw composts than from the mature composts. In general, CaCl2-extractable metals did not correlate significantly with the metal content of the composts. With DTPA-extractable metals, the only ones that showed significant correlations between the quantity of metal extracted by DTPA and the metal content of the samples in nearly all the composts studied were Pb and Zn.

The load of ‘zinc equivalent’ increased with the composting and maturation processes, and the Cd/Zn ratio decreased with those processes.

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堆肥和熟化过程对某些有机废弃物重金属可提取性的影响
以好氧污泥、城市垃圾、泥炭渣和葡萄渣4种有机残渣为原料,采用螯合剂(二乙烯三胺五乙酸,DTPA)和中性盐溶液(0.05 m CaCl2),研究了堆肥和熟化过程对残渣中Fe、Cu、Ni、Zn、Cd、Pb、Cr、Mn可萃取性的影响。由于堆肥和熟化过程中材料重量的损失,增加了材料中重金属的浓度。金属也变得更加不溶性,从原料堆肥中使用的萃取剂比从成熟堆肥中去除更多的金属。总体而言,cacl2可萃取金属与堆肥中金属含量的相关性不显著。对于DTPA可提取的金属,几乎所有堆肥中DTPA提取的金属量与样品中金属含量呈显著相关的金属只有Pb和Zn。“锌当量”负荷随堆肥和熟成过程的增加而增加,Cd/Zn比值随熟成和熟成过程的减小而减小。
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