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Title:Treatment of mixed chlorinated solvents and 1,4-dioxane in groundwater – Testing of two biodegradation strategies
Author(s):Pope, Donald
emerging contaminants
chlorinated solvents
Abstract:Presented by: Donald Pope – Scientist at GHD, Co-authors: Jennifer Wasielewski, Ryan Thomas, Sophia Dore Abstract: 1,4-dioxane is often found where chlorinated volatile organic compounds (CVOC) are present in groundwater. CVOC and 1,4-dioxane are present in the subsurface at a site in California. A laboratory treatability study was performed to assess the effectiveness of biodegradation for treatment of soil and groundwater from the site under sequential anaerobic / aerobic conditions and under aerobic conditions using a co-metabolic pathway. Under anaerobic conditions reductive dechlorination of chlorinated compounds to ethane and ethene can occur. However 1,4-dioxane does not degradedunder anaerobic conditions, however it can be degraded under aerobic conditions. Chlorinated compounds such as PCE and TCE can be degraded under aerobic conditions via a cometabolic pathway. Two strategies were tested to treat the mixed chlorinated solvent/1,4-dioxane plume. The first was to to treat chlorinated solvents under anaerobic conditions and subseqently the conditions were made aerobic to treat 1,4-dioxane. The second stragegy was for 1,4-dioxane and CVOC to be degraded together under aerobic conditions by a co-metabolic pathway. The results of this study showed that CVOC were removed under anaerobic conditions and under aerobic, co-metabolic conditions; however, greater treatment was observed under anaerobic conditions. Degradation of 1,4-dioxane was observed under both sets of conditions. Biography: Donald runs the GHD Innovative Technology Laboratory. Don has 17 years’ experience in performing analytical testing on groundwater, soil, and gas samples in the laboratory in Niagara Falls. The analyses are performed in support of treatability studies and in support of forensic work. He is also in charge of the preparation and setup of the treatability studies conducted in the lab. The treatability studies include chemical oxidation, enhanced bioremediation, solidification and stabilization, wastewater testing and dewatering studies.
Issue Date:2021-04-27
Series/Report:2021 Emerging Contaminants in the Environment Conference (ECEC21)
Genre:Presentation / Lecture / Speech
Conference Paper / Presentation
Date Available in IDEALS:2021-04-26

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