Laboratory Study of the Effect of Thermal Treatment on the Metal Leaching Characteristics of Soils from Manufactured Gas Plant Sites. Topical Report April 1988-August 1989

摘要

As part of GRI's program to evaluate and develop technologies which are potentially applicable for remediation of manufactured gas plant sites, bench-scale tests were performed to show whether thermal treatment of soil to remove organic contaminants would increase the leachability of regulated metals present in the soils. Soil samples from six Manufactured Gas Plant (MGP) sites were characterized and subjected to various temperature and atmosphere conditions in a static laboratory oven. Treated and untreated soil samples were subjected to the EPA standard EP toxicity leaching test as well as an ASTM leaching test using distilled water. Concentrations of regulated metals in the leachates were compared to determine the influence of treatment conditions and soil type on leaching behavior. The study showed that at conditions expected to be required for thermal treatment, metal leaching characteristics were not significantly altered. Based on the soils tested and other MGP soil analyses, Resource Conservation and Recovery Act (RCRA) metals appear to be present at levels which should not result in failure of the EP toxicity test criteria.