Physical Sciences and Mathematics Commons^™

Microwave Treatment Of Hazardous Wastes : Chemical Fixation Of Insoluble Non-Volatile, Chemically Non-Reactive Organics In Soil, Naihong Zhu

Theses

Microwave treatment of hazardous wastes like dioxin-contaminated soil potentially fills a great need for a remediation technology which potentially can be applied in-situ: the EPA has concluded from a risk assessment study that it is the excavation and transportation of such wastes that poses the greatest risk. Studies have been carried out on a surrogate for dioxin, namely, 9,10-anthraquinone because it has similar chemical and physical properties but it is not toxic. It was found in microwave treatment studies that, at temperatures attainable in-situ, anthraquinone became non-extractable. A model was proposed which postulated that as water was removed from soil …

Thermal Desorption Of Contaminated Soils, Hsi-Ming Sung

Theses

A new method by employing the heating probe for the in-situ cleanup of soils that are contaminated with volatile organic hazardous substances is explored. This investigation is a laboratory simulation that was aimed to evaluate the feasibility of desorption of volatile organic compoumds (VOCs) from soil, and to determine the efficiency of the heating probe for maximum desorption.

Two organic compounds, Trichloroethylene, Carbon tetrachloride, were selected as simulants. The experimental results demonstrate that the removal efficiency range from 97.65% to >99.95% of Trichloroethylene and 98.14% to >99.95% of Carbon tetrachloride can be recovered for a 24 hour interval with a …

Thermal Desorption Of Organic Contaminant From Sand Using A Continuous Feed Rotary Kiln, Hsien-Tsung Chern

Theses

The purpose of this research was to determine the feasibility of removing organic contaminants from sand by thermal desorption. A continuous feed rotary kiln was designed and constructed to study the thermal desorption behavior of organic contaminant from sand with respect to temperature and residence time, and to develop a mathematical model that will describe this desorption behavior. The model will allow prediction of the desorption rate of an organic contaminant in larger scale rotary kiln desorption system over temperature at a known set of residence time.

In this experiment, sand was uniformly contaminated with a known amount of organic …