Biodegradation of CVOCs and 1,4-Dioxane Mixtures by Engineered Microbial Communities
[Technical Report, Final Report]
CALIFORNIA UNIV LOS ANGELESGeosyntec Consultants
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The overarching objective of this limited-scope project was to understand and apply potential treatment synergies to ultimately achieve biodegradation of multiple contaminants in source zones as well as distal plumes. Specifically, we formulated a microbial community to simultaneously or sequentially degrade chlorinated volatile organic compounds CVOCs and 1,4-dioxane across changing redox environments. Some CVOCs have used 1,4-dioxane as a solvent stabilizer. Consequently, 1,4-dioxane is detected as a co-occurring contaminant with CVOCs at many contaminated sites. Anaerobic biological reduction is a common remediation approach for CVOCs like trichloroethene TCE. However, under some conditions, intermediate daughter products, such as cis-1,2-dichloroethene cDCE and vinyl chloride, are accumulated, which may be more toxic than their parent compounds. Aerobic cometabolism of CVOCs requires additional amendments of primary substrates. 1,4-Dioxane is mainly biodegraded under aerobic conditions.
- ENVIRONMENTAL HEALTH AND SAFETY
- Organic Chemistry