Evaluation of exothermic solidification/stabilization binding agents to enhance the removal of trichloroethylene from combined waste.

摘要

In this study a heavy metal contaminated soil containing cadmium, chromium, and lead was spiked with TCE. A series of chemical and physical tests were performed to determine the effects of the binder additives on the removal of TCE from the soil. These tests were also used to determine if the metals contained in the soil were effectively immobilized by the binder additives. This study involved the design and construction of an adiabatic reactor used to conduct the experiments. A multivariate Response Surface Methodology Analysis (RSMA) procedure was used to interpret the effects five treatments at three levels. The physical tests conducted to evaluate the effects of the binder additives included unconfined compressive strength, cone index, moisture tests, volume expansion test, and wet/dry tests. The chemical tests included real-time TCE analysis, total pre- and post-soil extractions for TCE and metals, the toxicity characteristic leaching procedure, and the sequential batch leaching test. Results indicate that TCE is effectively removed from the spiked soil and the metals are stabilized. It is anticipated that this study could lead to full-scale application of exothermic solidification/stabilization for combined (organic and metal) contaminated soil and/or sludges. The development of such technology will most likely be much lower in cost than those currently utilized to treat a combined contaminated soil and sludges.