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Long-term leaching behaviours of cement composites prepared by hazardous wastes

机译：危险废物制备的水泥复合材料的长期浸出行为

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In order to evaluate the long-term environmental impact of Eco-Ordinary Portland Cement (EOPC) prepared by municipal solid wastes (MSS) and hazardous wastes (HW), consecutive leaching tests with a time span of 180 days were conducted on the EOPC composites in the compact and ground forms under deionized and saline water conditions. The results show that the heavy metals investigated can be classified into three groups according to their leaching behaviours. The concentrations of?V, Pb, Ni, Ba, Cd and Zn in the leachate increase with the leaching time, which can be classified into the first group. Cu and Sn are in the second group, and their concentrations increase initially, and decline afterward. Cr and As are in the third group, and their concentrations decline firstly, followed by a clear increase. Besides, a kinetic study was also conducted in the present study, revealing that the leaching behaviours of heavy metals follow a second-order model. Furthermore, our results suggest that the EOPC is resistant to the saline water, but the application of such materials in marine conditions should be paid attention to due to the pollution of arsenic.
机译：为了评估由城市固体废物（MSS）和危险废物（HW）制备的生态普通硅酸盐水泥（EOPC）的长期环境影响，对EOPC复合材料进行了连续180天的浸出试验在去离子水和盐水条件下以致密和研磨形式存在。结果表明，所研究的重金属可根据其浸出行为分为三类。渗滤液中？V，Pb，Ni，Ba，Cd和Zn的含量随浸出时间的增加而增加，可分为第一类。铜和锡在第二组中，它们的浓度先增加，然后降低。 Cr和As位于第三组，其浓度先下降，然后明显上升。此外，本研究还进行了动力学研究，发现重金属的浸出行为遵循二阶模型。此外，我们的结果表明，EOPC对盐水具有抵抗力，但是由于砷的污染，应注意在海洋条件下使用此类材料。

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