Stabilization of heavy metals in lightweight aggregate made from sewage sludge and river sediment.
Stabilization of heavy metals in lightweight aggregate made from sewage sludge and river sediment.
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DOI：
10.1016/j.jhazmat.2013.04.006
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发表时间：
2013-09
影响因子：
13.6
通讯作者：
Guo-ren Xu;Mingwei Liu;Guibai Li
中科院分区：
文献类型：
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作者：
Guo-ren Xu;Mingwei Liu;Guibai Li
本研究的主要目的是探讨重金属在以污泥与河流沉积物为原料制成的轻集料中的稳定性。研究了烧结温度、（Fe 2 O3 + CaO + MgO）/（SiO2+ Al 2 O3）比（K比）、SiO2/Al 2 O3和Fe 2 O3/CaO/MgO（固定K比）、pH和氧化条件对重金属稳定化的影响。在高于1100 °C的温度下烧结可有效地将Cd、Cr、Cu和Pb结合在LWA中，因为重金属的稳定形式与铝硅酸盐或硅酸盐框架牢固结合。Cd、Cr、Cu和Pb的重金属吸附能力在K值为0.175 ~ 0.2时达到最低。当LWA经受严格的浸出条件时，即使LWA本体结构被破坏，重金属仍保留在固体中。因此，用污水污泥和河流沉积物制成的LWA可用作土木工程和其他建筑应用的环境安全材料。
The primary goal of this research is to investigate the stabilization of heavy metals in lightweight aggregate (LWA) made from sewage sludge and river sediment. The effects of the sintering temperature, the (Fe2O3+ CaO + MgO)/(SiO2+ Al2O3) ratio (Kratio), SiO2/Al2O3and Fe2O3/CaO/MgO (at fixedKratio), pH, and oxidative conditions on the stabilization of heavy metals were studied. Sintering at temperatures above 1100 °C effectively binds Cd, Cr, Cu and Pb in the LWA, because the stable forms of the heavy metals are strongly bound to the aluminosilicate or silicate frameworks. Minimum leachabilities of Cd, Cr, Cu and Pb were obtained atKratios between 0.175 and 0.2. When the LWA was subjected to rigorous leaching conditions, the heavy metals remained in the solid even when the LWA bulk structure was broken. LWA made with sewage sludge and river sediment can therefore be used as an environmentally safe material for civil engineering and other construction applications.