| Title |
Feasibility of Natural Attenuation for TCE Anaerobic Reductive Dechlorination Using Microsized Corn-Oil Droplet as an Activator |
| Authors |
한경진 ( Kyungjin Han ) ; 김희윤 ( Huiyun Kim ) ; 권수열 ( Sooyoul Kwon ) ; 김영 ( Young Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2024.40.1.11 |
| Keywords |
Microsized Corn-Oil Droplet; MOD; Natural attenuation; Reductive dechlorination; Trichloroethylene; TCE |
| Abstract |
Recently, enhanced in situ bioremediation using slow substrate release techniques has been actively researched for managing TCE-contaminated groundwater. This study conducted a lab-scale batch reactor experiment to evaluate the feasibility of natural attenuation for TCE dechlorination using microsized corn-oil droplet (MOD) as an activator considering the following three factors: 1) TCE dechlorination in the presence or absence of MOD; 2) TCE dechlorination in the presence or absence of inactivator of native microbial activity; and 3) MOD concentration effects on TCE dechlorination. Batch reactors were constructed using site groundwater and soil in which Dehalococcoides bacteria were present. Without MOD, TCE was decomposed into dichloroethylene (DCE). However, other by-products of TCE dechlorination were not detected. With MOD, DCE, vinyl chloride (VC), and ethylene (ETH) were sequentially observed. This result confirmed that MOD effectively supplied electrons to complete dechlorination of TCE to ETH. However, when an excess of MOD was provided, it formed unfavorable conditions for anaerobic digestion because dechlorination reaction did not proceed while propionic acid was accumulated after DCE was generated. Therefore, if an appropriate amount of MOD is supplied, MOD can be effectively used as a natural reduction activator to promote biodegradation in an aquifer contaminated by TCE. |