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首页> 外文期刊>Journal of Environmental Sciences >Leaching of metals on stabilization of metal sludge using cement based materials
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Leaching of metals on stabilization of metal sludge using cement based materials

机译：使用水泥基材料浸出金属以稳定金属污泥

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摘要

Toxicity characteristic leaching procedure(TCLP) of zinc plating sludge was carried out to assess the leaching potential of the sludge and the leachates were analyzed for heavy metals. The concentration of zinc, chromium, and lead in the leachate were 371.5 mg/L, 1.95 mg/L and 1.99 mg/L respectively. Solidification of zinc sludge was carried out using four different binder systems consisting of cement mortar, fly ash, clay and lime and cured for 28 d. The ratio of sludge added varied from 60 percent to 80 percent by volume. The solidified products were tested for metal fixing efficiency and physical strength. It was observed that the volume of sludge added that resulted in maximum metal stabilization was 60 percent for all the combinations, above which the metal fixation efficiency decreased resulting in high values of zinc in the leachate. Addition of 5 percent sodium silicate enhanced the chemical fixation of metals in all the binder systems. Among the four fixing agents studied, mixture of fly ash: lime, and cement mortar: lime stabilized zinc and other metals in the sludge effectively than other combinations. Addition of lime increased the stabilization of zinc whereas cement mortar increased the strength of the solidified product.
机译：进行了镀锌污泥的毒性特征浸出程序（TCLP），以评估污泥的浸出潜力，并对渗滤液中的重金属进行了分析。渗滤液中锌，铬和铅的浓度分别为371.5 mg / L，1.95 mg / L和1.99 mg / L。使用四种不同的粘合剂体系（包括水泥砂浆，粉煤灰，粘土和石灰）固化锌污泥，并固化28天。污泥的添加量按体积计从60％到80％不等。测试固化产物的金属固定效率和物理强度。观察到，对于所有组合而言，导致最大程度的金属稳定性的添加的污泥量为60％，在此之上，金属固定效率下降，导致渗滤液中的锌含量较高。添加5％的硅酸钠可增强所有粘合剂体系中金属的化学固定性。在研究的四种固定剂中，粉煤灰：石灰和水泥砂浆：石灰的混合物比其他组合有效地稳定了污泥中的锌和其他金属。加入石灰增加了锌的稳定性，而水泥砂浆增加了固化产品的强度。

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