키조개(Atrina pectinata)를 이용한 납과 비소 오염토양의 안정화

Abstract

Lead and arsenic contamination in soils are known pollutants that can cause disease in people located within the vicinity of mines. Pen shells(PS) is the third most consumed shellfish in South Korea and is one of the main sources of calcareous wastes that is being dumped illegally along the coast. In this study, the natural and calcined PS were evaluated as soil amendments for evaluating the stabilizing the lead and arsenic contaminated soil. Three single extraction methods(0.1 M HCl, EDTA-NH4OAc, SBET) were performed to evaluate the applicability of the amendment for lead and arsenic stabilization. The mechanism responsible for the stabilization of lead and arsenic in the contaminated soil was evaluated by XRD and SEM-EDX analyses. The results of the three single extraction methods showed that the amendments were conditionally effective for lead and arsenic stabilization owing to the calcareous nature of the PS. The mechanism for the stabilization of those pollutants revealed that effective stabilization was associated with pozzolanic reaction products such as CSH and Ettringite. Moreover, in order to accurately evaluate the stabilization process, appropriate evaluation methods should be selected and studied in future work.