Stabilization of Characteristically Hazardous Volatile Organic Compounds and Metals Using Rice Hull Ash and Lime Kiln Dust

摘要

The effectiveness of stabilizing hazardous volatile organic compounds and metals was tested by mixing soils with the following materials individually or as mixtures: lime kiln dust, Portland cement, powdered bentonite clay, rice hull ash, a phosphate amendment, and sodium silicate in aqueous solution. The soils being treated also contain high concentrations of polychlorinated biphenyls, semi-volatile organic compounds, and nonaqueous-phase liquids. The primary objective is to identify an in situ treatment that will render soils nonhazardous and, therefore, substantially reduce transport and disposal costs. Testing showed that volatile organic compounds and metals were stabilized successfully using the sodium silicate solution and various mixtures of rice hull ash and lime kiln dust or Portland cement.