Accession Number:

AD1076485

Title:

Synergistic Reductive Dechlorination of 1,1,1-Trichloroethane and Trichloroethene and Aerobic Biodegradation of 1,4-Dioxane

Descriptive Note:

[Technical Report, Final Report]

Corporate Author:

Arizona State UniversityFLORIDA STATE UNIV TALLAHASSEEAptwater, Inc.

Report Date:

2019-05-31

Pagination or Media Count:

116

Abstract:

Groundwater co-contaminated with 1,4-dioxane and 1,1,1-trichloroethane TCA andor trichloroethene TCE is common. We tested a synergistic platform featuring anaerobic TCETCA reduction in a H2-based reactor followed by aerobic 1,4-dioxane biodegradation in a O2-based membrane biofilm reactor O2-MBfR. For the H2-based reduction stage, we evaluated the hydrogen-based Membrane Biofilm Reactor MBfR and a new hydrogen-based Membrane Palladium-film Reactor MPfR. We conducted parallel modeling and experimental programs for the two MBfRs and an experimental program for the MPfR. Our evaluations proved that the rate and selectivity for reductive dichlorination of TCETCA to ethane was significantly higher with the MPfR than the MBfR. We configured the synergistic platform by linking the H2-based MPfR with a 1,4-dioxane oxidizing O2-MBfR in sequence. The ethane produced from reduction of TCE and TCA served as the primary electron donor for com-metabolic biodedgradation of 1,4-dioxane in the O2-MBfR. In summary, we demonstrated proof-of-concept for removing TCE, TCA, and 1,4-dioxane without accumulation of toxic intermediates in a synergistic platform featuring a H2-based MPfR for Pd-catalyzed TCETCA reduction followed by an O2-based MBfR for biological degradation of 1,4-dioxane plus products from TCETCA reduction. This research advanced understanding of the fundamental factors controlling Pd-catalyzed reductive dechlorination and the co-metabolic biodegradation of dioxane derivatives.

Subject Categories:

  • Water Pollution and Control
  • Biochemistry
  • Microbiology

Distribution Statement:

[A, Approved For Public Release]