Instituto de Recursos Naturales y Agrobiología (CSIC), Apartado 1052, 41080 Sevilla, Spain.
J Hazard Mater. 2010 Apr 15;176(1-3):792-8. doi: 10.1016/j.jhazmat.2009.11.104. Epub 2009 Nov 26.
The influence of a composted biosolid from urban wastewater treatment on the retention and solubility of Cu, Pb or Zn added to a soil was studied by batch adsorption/desorption experiments, equilibrating both materials and their mixtures with solutions containing various metal concentrations. The composted biosolid adsorbed less Cu or Pb and slightly more Zn than the soil, and thus caused a noticeable decrease in the retention of Cu or Pb and an increase in Zn adsorption by soil-biosolid mixtures, but these effects in the mixtures were not additive for any metal. The pH effects were studied by means of (log metal concentration)/pH diagrams. It was shown that Cu behaviour was different from that of the other metals: the relation between pH and Cu concentrations suggested similar solubilities in the presence of the biosolid and the mixtures, whereas the biosolid-free soil gave data located on a region of the diagram corresponding to slightly lower solubility. In the case of Pb or Zn, the data for the biosolid were located in a region of the diagram corresponding to clearly lower solubilities than those for the biosolid/soil mixtures. It was concluded that the biosolid has little effect on metal solubility when it is mixed with the soil in the proportions used here.
研究了城市废水处理的堆肥生物固体对添加到土壤中的 Cu、Pb 或 Zn 的保留和溶解度的影响，通过批量吸附/解吸实验使两种材料及其混合物与含有不同金属浓度的溶液达到平衡。堆肥生物固体对 Cu 或 Pb 的吸附量小于土壤，对 Zn 的吸附量略高，因此导致 Cu 或 Pb 的保留量明显下降，土壤-生物固体混合物中 Zn 的吸附量增加，但这些混合物中的效应对于任何金属都不是加性的。通过（log 金属浓度）/pH 图研究了 pH 效应。结果表明，Cu 的行为不同于其他金属：pH 和 Cu 浓度之间的关系表明，在生物固体和混合物存在的情况下，Cu 的溶解度相似，而无生物固体的土壤给出的数据位于与溶解度略低对应的图表区域。对于 Pb 或 Zn，生物固体的数据位于与生物固体/土壤混合物的溶解度明显较低对应的图表区域。结论是，当生物固体与土壤以这里使用的比例混合时，对金属溶解度的影响很小。
