4.3 Article

Groundwater Circulation Enhanced Electrobioremediation of 1,2-Dichloroethane in a Simulated Heterogeneous Aquifer

Journal

ENVIRONMENTAL ENGINEERING SCIENCE
Volume 39, Issue 7, Pages 606-615

Publisher

MARY ANN LIEBERT, INC
DOI: 10.1089/ees.2021.0130

Keywords

biodegradation; chlorinated solvents; electrochemistry; groundwater circulation

Funding

  1. National Natural Science Foundation of China [32061133002]
  2. Ministry of Science and Technology of China [2018YFC1802504]
  3. Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUGGC06]

Ask authors/readers for more resources

This study demonstrates a groundwater circulation enhanced electrobioremediation process that effectively stimulates the biological degradation of 1,2-DCA in heterogeneous aquifers.
This study demonstrates a groundwater circulation enhanced electrobioremediation process for 1,2-dichloroethane (1,2-DCA) degradation in a simulated heterogeneous aquifer, in which a pair of electrodes were separately implanted between an injection well and an abstraction well and groundwater circulation carries anodic O-2 and cathodic H-2 sequentially into the aquifer forming oxidation and reduction regions. A two-dimensional tank was filled with interbedded sandy-clayed sediments to simulate the field aquifer conditions. It is expected that the interbedded clayed sediments could supply bacteria for biological degradation and also supply Fe(II) for chemical oxidation in the presence of O-2 due to hydroxyl radical (center dot OH) production. At a constant circulation flow rate of similar to 3.5 PVs/day, 1,2-DCA at an initial concentration of similar to 8.07 mg/L was degraded to similar to 0.65 mg/L (91.9% removal) after 33-day treatment, in which 80-100 mA current was applied to the electrodes after the initial stage of 8-day circulation. Batch experiments proved that 1,2-DCA degradation was mainly attributed to aerobic biological oxidation, with likely contribution of anaerobic reductive dechlorination in certain areas. Chemical 1,2-DCA oxidation was negligible. This study suggests that coupling groundwater circulation and separated electrolysis is effective for stimulating biological 1,2-DCA degradation in heterogeneous aquifers.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.3
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available