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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2004.1
- 수록면
- 456 - 464 (9page)
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초록· 키워드
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Degradative solidification/stabilization(DS/S) is a new technology which enhances removal mechanisms of contaminants over the physicochemical immobilization mechanisms provided by conventional cement-based S/S. DS/S can be applied to remove chlorinated hydrocarbons and to immobilize heavy metals, simultaneously in contaminated soils and mixed wastes. A DS/S system using cement/slag/Fe(II) was investigated to assess its effectiveness in degrading the trichloroethylene(TCE) contained in S/S products of hazardous liquid wastes. Batch reactors were used to measure kinetics of reductive dechlorination of TCE in both slurry and solid phases. Through screening experiments, combined binder systems, cement/slag/Fe(II), were chosen because they showed the better TCE removal efficiency than single binder systems, such as cement/Fe(II) and slag/Fe(II). The chosen system was further characterized under various conditions by changing experimental parameters such as Fe(II) dose, TCE concentration, and cement/slag ratio. As a result, an optimum dose of Fe(II) was determined on a basis of ratio of rate constants over Fe(II) doses. The optimized system could completely remove TCE for less than 40days from the S/S forms of 11,600ppm TCE liquid waste. Slag substitution for cement in combined binder systems brought about a slight decrease of the pseudo first order reaction constants from 1.0 to 0.6day-1, and a significant decrease of unconfined compressive strengths (UCS), thereby 90% substitution of slag could not meet 50psi UCS guidance of US EPA.
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