TY - JOUR
T1 - A Synergistic Platform for Continuous Co-removal of 1,1,1-Trichloroethane, Trichloroethene, and 1,4-Dioxane via Catalytic Dechlorination Followed by Biodegradation
AU - Luo, Yi Hao
AU - Long, Xiangxing
AU - Wang, Boya
AU - Zhou, Chen
AU - Tang, Youneng
AU - Krajmalnik-Brown, Rosa
AU - Rittmann, Bruce E.
N1 - Funding Information:
We express our gratitude to the U.S. Department of Defense (DOD) Strategic Environmental Research and Development Program (SERDP) (ER-2721) for funding the majority of this work. This work also received additional financial and technical support from the National Science Foundation Nanosystems Engineering Research Center on Nanotechnology-Enabled Water Treatment (NEWT) (EEC-1449500) and the Nanotechnology Collaborative Infrastructure Southwest (NNCI-ECCS-1542160). We also gratefully acknowledge the use of electron microscopic facilities supervised by David Lowry in the School of Life Science and by Karl Weiss and Dr. Manuel Roldan Gutierrez in the LeRoy Eyring Center for Solid State Science, both at Arizona State University.
Publisher Copyright:
© 2021 American Chemical Society. All rights reserved.
PY - 2021/5/4
Y1 - 2021/5/4
N2 - Groundwater co-contaminated with 1,4-dioxane, 1,1,1-trichloroethane (TCA), and trichloroethene (TCE) is among the most urgent environmental concerns of the U.S. Department of Defense (DoD), U.S. Environmental Protection Agency (EPA), and industries related to chlorinated solvents. Inspired by the pressing need to remove all three contaminants at many sites, we tested a synergistic platform: catalytic reduction of 1,1,1-TCA and TCE to ethane in a H2-based membrane palladium-film reactor (H2-MPfR), followed by aerobic biodegradation of ethane and 1,4-dioxane in an O2-based membrane biofilm reactor (O2-MBfR). During 130 days of continuous operation, 1,1,1-TCA and TCE were 95-98% reductively dechlorinated to ethane in the H2-MPfR, and ethane served as the endogenous primary electron donor for promoting 98.5% aerobic biodegradation of 1,4-dioxane in the O2-MBfR. In addition, the small concentrations of the chlorinated intermediate from the H2-MPfR, dichloroethane (DCA) and monochloroethane (MCA), were fully biodegraded through aerobic biodegradation in the O2-MBfR. The biofilms in the O2-MBfR were enriched in phylotypes closely related to the genera Pseudonocardia known to biodegrade 1,4-dioxane.
AB - Groundwater co-contaminated with 1,4-dioxane, 1,1,1-trichloroethane (TCA), and trichloroethene (TCE) is among the most urgent environmental concerns of the U.S. Department of Defense (DoD), U.S. Environmental Protection Agency (EPA), and industries related to chlorinated solvents. Inspired by the pressing need to remove all three contaminants at many sites, we tested a synergistic platform: catalytic reduction of 1,1,1-TCA and TCE to ethane in a H2-based membrane palladium-film reactor (H2-MPfR), followed by aerobic biodegradation of ethane and 1,4-dioxane in an O2-based membrane biofilm reactor (O2-MBfR). During 130 days of continuous operation, 1,1,1-TCA and TCE were 95-98% reductively dechlorinated to ethane in the H2-MPfR, and ethane served as the endogenous primary electron donor for promoting 98.5% aerobic biodegradation of 1,4-dioxane in the O2-MBfR. In addition, the small concentrations of the chlorinated intermediate from the H2-MPfR, dichloroethane (DCA) and monochloroethane (MCA), were fully biodegraded through aerobic biodegradation in the O2-MBfR. The biofilms in the O2-MBfR were enriched in phylotypes closely related to the genera Pseudonocardia known to biodegrade 1,4-dioxane.
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U2 - 10.1021/acs.est.1c00542
DO - 10.1021/acs.est.1c00542
M3 - Article
C2 - 33881824
AN - SCOPUS:85105491388
SN - 0013-936X
VL - 55
SP - 6363
EP - 6372
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 9
ER -