Navarro-Blasco I, Duran A, Pérez-Nicolás M, Fernández J M, Sirera R, Alvarez J I
MIMED Research Group, Department of Chemistry and Soil Sciences, School of Sciences, University of Navarra, Irunlarrea, 1, 31008 Pamplona, Spain.
MIMED Research Group, Department of Chemistry and Soil Sciences, School of Sciences, University of Navarra, Irunlarrea, 1, 31008 Pamplona, Spain.
J Environ Manage. 2015 Aug 15;159:288-300. doi: 10.1016/j.jenvman.2015.05.029. Epub 2015 May 27.
Phosphate coating hazardous wastes originated from the automotive industry were efficiently encapsulated by an acid-base reaction between phosphates present in the sludge and calcium aluminate cement, yielding very inert and stable monolithic blocks of amorphous calcium phosphate (ACP). Two different compositions of industrial sludge were characterized and loaded in ratios ranging from 10 to 50 wt.%. Setting times and compressive strengths were recorded to establish the feasibility of this method to achieve a good handling and a safe landfilling of these samples. Short solidification periods were found and leaching tests showed an excellent retention for toxic metals (Zn, Ni, Cu, Cr and Mn) and for organic matter. Retentions over 99.9% for Zn and Mn were observed even for loadings as high as 50 wt.% of the wastes. The formation of ACP phase of low porosity and high stability accounted for the effective immobilization of the hazardous components of the wastes.
汽车工业产生的含磷涂层危险废物通过污泥中的磷酸盐与铝酸钙水泥之间的酸碱反应得到有效封装，生成了非常惰性且稳定的非晶态磷酸钙（ACP）整体块体。对两种不同成分的工业污泥进行了表征，并以10%至50%（重量）的比例进行加载。记录了凝结时间和抗压强度，以确定该方法实现这些样品良好处理和安全填埋的可行性。发现固化期较短，浸出试验表明对有毒金属（锌、镍、铜、铬和锰）和有机物具有优异的保留能力。即使废物加载量高达50%（重量），锌和锰的保留率仍超过99.9%。低孔隙率和高稳定性的ACP相的形成解释了废物中危险成分的有效固定。
