Migration of calcium hydroxide compounds in construction waste soil

Advances in Environmental Research Pub Date : 2015-09-25 DOI:10.12989/AER.2015.4.3.183

E. Shin, Jeong-Ku Kang

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引用次数: 4

Abstract

Migration of leachate generated through embankment of construction waste soil (CWS) in low-lying areas was studied through physical and chemical analysis. A leachate solution containing soluble cations from CWS was found to have a pH above 9.0. To determine the distribution coefficients in the alkali solution, column and migration tests were conducted in the laboratory. The physical and chemical properties of CWS satisfied environmental soil criteria; however, the pH was high. The effective diffusion coefficients for CWS ions fell within the range of 0.725 - 3.3 × 10-6 cm2/s. Properties of pore water and the amount of undissolved gas in pore water influenced advection.diffusion behavior. Contaminants migrating from CWS exhibited time-dependent concentration profiles and an advective component of transport. Thus, the transport equations for CWS contaminant concentrations satisfied the differential equations in accordance with Fick's 2nd law. Therefore, the migration of the contaminant plume when the landfilling CWS reaches water table can be predicted based on pH using the effective diffusion coefficient determined in a laboratory test.

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氢氧化钙化合物在建筑垃圾土壤中的迁移

通过理化分析研究了低洼地区建筑垃圾土路基渗滤液的迁移规律。含水煤浆可溶阳离子的渗滤液pH值大于9.0。为确定其在碱溶液中的分布系数，在实验室进行了色谱柱和迁移试验。水煤浆理化性质符合环境土壤标准;然而，pH值很高。水煤浆离子的有效扩散系数为0.725 ~ 3.3 × 10-6 cm2/s。孔隙水的性质和孔隙水中未溶解气体的含量影响平流。扩散行为。从水煤浆迁移的污染物表现出随时间变化的浓度分布和平流输送成分。因此，水煤浆污染物浓度的输运方程符合菲克第二定律的微分方程。因此，利用实验室试验确定的有效扩散系数，可以基于pH值预测垃圾填埋场水煤浆到达地下水位时污染物羽流的迁移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Advances in Environmental Research

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