Innovative treatment of soil contamination: radiolytic destruction of dioxin and co-contaminants by cobalt-60

Roger J. Hilarides*, Kimberly A. Gray

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Recent work in our laboratory has demonstrated that gamma radiolysis is a feasible method by which 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) can be converted to products of negligible toxicity. A standard soil has been artificially contaminated to a level of 100 ppb TCDD and destruction to a level less than 1 ppb has been achieved at a radiation dose of 800 KGy and with the addition of certain soil amendments (water and surfactant). By-product analysis has illustrated that the destruction occurs via step-wise reductive dechlorination and mass balance on carbon has been demonstrated. The presence of co-contaminants at much higher levels does not interfer with TCDD destruction. These results in combination with scavenger studies and target theory calculations indicate that direct radiation effects account for the major route of destruction. Process efficiency has been verified using real contaminated soils and sediments. A reactor design is proposed and an economic analysis is presented to show that radiolysis is technically feasible and economically competitive.

Original languageEnglish (US)
Title of host publicationCritical Issues in Water and Wastewater Treatment
EditorsJoseph N. Ryan, Marc Edwards
PublisherPubl by ASCE
Pages733-736
Number of pages4
ISBN (Print)0784400318
StatePublished - Jan 1 1994
EventProceedings of the 1994 National Conference on Environmental Engineering - Boulder, CO, USA
Duration: Jul 11 1994Jul 13 1994

Other

OtherProceedings of the 1994 National Conference on Environmental Engineering
CityBoulder, CO, USA
Period7/11/947/13/94

ASJC Scopus subject areas

  • Environmental Engineering

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