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Assessment of cement kiln dust (CKD) for stabilization/solidification (S/S) of arsenic contaminated soils

机译:水泥窑粉尘(CKD)对砷污染土壤的稳定/固化(S / S)的评估

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A stabilization/solidification (S/S) process for arsenic (As) contaminated soils was performed using cement kiln dust (CKD) to immobilize As in soils. Slurry samples were prepared using two different types of clays (kaolinite and motmorillonite). Laboratory-prepared slurries and field soils spiked with either 0.1% (w. t.). As or As were subjected to the S/S treatment using varying amounts of CKD. The effectiveness of treatment was evaluated upon 1 day of tumbling and 7 days of aging based on the toxicity characteristic leaching procedure (TCLP). As-CKD and As-Clay-CKD slurries were prepared with either 10% (w. t. ). As or As and then the resulting crystalline phases were analyzed by X-ray powder diffraction (XRPD). Overall, the TCLP results showed that only the As concentrations in the presence of kaolinite were less than the TCLP regulatory limit of 5mg/L after 1 day of tumbling. The TCLP-As concentrations obtained from montmorillonite samples failed to meet the TCLP criteria within 7 days. In the field soil samples, only the TCLP-As concentrations obtained from the spiked samples were less than 5mg/L after 1 day of curing. XRPD results showed that Ca-As-O and NaCaAsO·7. 5HO were responsible for the immobilization of As and As, respectively.
机译:使用水泥窑粉尘(CKD)对砷(As)污染的土壤进行稳定/固化(S / S)工艺,以将As固定在土壤中。使用两种不同类型的粘土(高岭石和蒙脱石)制备浆料样品。实验室制备的泥浆和田间土壤的掺加量为0.1%(重量)。使用不同量的CKD对As或As进行S / S处理。根据毒性特征浸出程序(TCLP),在翻滚1天和衰老7天后评估治疗效果。用10%(重量)的As-CKD和As-Clay-CKD浆料制备。 As或As,然后通过X射线粉末衍射(XRPD)分析所得的结晶相。总体而言,TCLP结果显示,翻滚1天后,仅在高岭石存在下的As浓度低于TCLP规定的极限值5mg / L。从蒙脱石样品中获得的TCLP-As浓度在7天内未达到TCLP标准。在田间土壤样品中,固化1天后,仅从加标样品中获得的TCLP-As浓度低于5mg / L。 XRPD结果表明为Ca-As-O和NaCaAsO·7。 5HO分别负责As和As的固定化。

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