Knop Alexandre, VanGulck Jamie, Heineck Karla Salvagni, Consoli Nilo Cesar
Knop Geotechnical Consultants, Brazil.
J Hazard Mater. 2008 Jun 30;155(1-2):269-76. doi: 10.1016/j.jhazmat.2007.11.056. Epub 2007 Nov 22.
The transport of contaminants through compacted artificially cemented soil subjected to acid leachate contaminant percolation was analyzed by means of laboratory column tests. The effect of cement content, degree of acidity and hydraulic gradient were evaluated after permeation of several pore volumes of acid leachate contaminant flow through the soil. The pH, electric conductivity and solute breakthrough curves were considered throughout the study. The results showed that the increase of cement content increases the solute pore volumes needed before breakthrough occurred. An increase of the degree of acidity of the percolate and of the hydraulic gradient cause a reduction in the pore volumes needed before breakthrough occurred. The larger the soil cement content, the longer the time required to reach maximum effluent solute concentration. The hydraulic conductivity slightly increased due to cement addition and reduced with increasing degree of acidity of the percolate. Finally, it is possible to state that cement addition to the soil was responsible for increasing retardation coefficient (R) and distribution coefficient (kd) values, meaning that the artificially cemented soils have higher capability to retard the propagation of the contamination and amplified affinity with dissolved acid contaminant.
通过实验室柱试验分析了在酸性渗滤液污染物渗流作用下，污染物在压实人工胶结土中的传输情况。在数孔隙体积的酸性渗滤液污染物流经土壤后，评估了水泥含量、酸度和水力梯度的影响。在整个研究过程中，考虑了pH值、电导率和溶质突破曲线。结果表明，水泥含量的增加会增加溶质突破前所需的孔隙体积。渗滤液酸度和水力梯度的增加会导致突破前所需的孔隙体积减少。土壤水泥含量越高，达到最大出水溶质浓度所需的时间越长。由于添加水泥，水力传导率略有增加，并随着渗滤液酸度的增加而降低。最后，可以说向土壤中添加水泥导致延迟系数（R）和分配系数（kd）值增加，这意味着人工胶结土具有更高的抑制污染传播能力和与溶解酸性污染物的增强亲和力。
