Abstract
A mixture of arsenic contaminated soil and reactive powder concrete (RPC) was developed to study the effect of arsenic contaminated soil on RPC mortar and the effectiveness of the mortar in containing the contaminant. The sufficient containment of arsenic contaminated waste products is important to protection of ground and surface water sources. A three phase experiment was designed to study the permeability, absorption coefficients, and Toxicity Characteristic Leaching Procedure (TCLP) leachate concentrations resulting from the application of a range of arsenic concentrations. The results showed that the permeability values for mixes containing different arsenic concentrations did not increase noticeably with adequate curing time. The percentage of absorption slightly increased with increasing arsenic content as did the TCLP leachate concentrations. Statistical analyses, Analysis of Variance (ANOVA) and Paired T-test, were performed to analyze percent absorption, and TCLP results. Based on the results it was concluded that percent absorption decreased significantly with increase in curing time. Although, the TCLP concentrations increased with increased curing time, the increase was not statistically significant.
Highlights
Studies have shown that stabilization/solidification technology processes for treatment of contaminated soils/ residues has been successful in stabilizing a wide variety of materials including metals, volatiles, waste oils and solvents creating a hard, soil-like material binding free liquids and chemicals [1,2,3]
The Toxicity Characteristic Leaching Procedure (TCLP) test results performed on cement, limestone dust, fine sand, uncontaminated soil and silica fume indicated that no arsenic was present in these materials
The results of the TCLP test performed for the last phase are representative of the arsenic which leached from the contaminated soil used in the mix preparation
Summary
Studies have shown that stabilization/solidification technology processes for treatment of contaminated soils/ residues has been successful in stabilizing a wide variety of materials including metals, volatiles, waste oils and solvents creating a hard, soil-like material binding free liquids and chemicals [1,2,3]. Portland cement produces a hardened paste upon addition of water This paste binds together aggregates and other substances to form concrete and stabilize wastes [9,10] This technology is currently being used to treat a wide variety of wastes and showed to be effective in reducing the mobility of arsenic wastes [11,12]. The main objective was to study water permeability and absorption of RPC during the storage of inorganic material, arsenic, by application of a solidification/stabilization technique.
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