Single-well, gas-sparging tests for evaluating the in situ aerobic cometabolism of cis-1,2-dichloroethene and trichloroethene
- Authors
- Kim, Young; Istok, Jonathan D.; Semprini, Lewis
- Issue Date
- 4월-2008
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- single-well; gas-sparging tests; CAH aerobic cometabolism; ethylene-oxide; propylene-oxide; acetylene inhibition
- Citation
- CHEMOSPHERE, v.71, no.9, pp.1654 - 1664
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMOSPHERE
- Volume
- 71
- Number
- 9
- Start Page
- 1654
- End Page
- 1664
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/123770
- DOI
- 10.1016/j.chemosphere.2008.01.021
- ISSN
- 0045-6535
- Abstract
- This study developed single-well, gas-sparging tests for assessing the feasibility of in situ aerobic cometabolism of trichloroethene (TCE) and cis-1,2-dichloroethene (cis-DCE) using propane and methane as growth substrates. Tests were performed in groundwater contaminated with TCE (100-400 mu g l(-1)) and cis-DCE (20-60 mu g l(-1)). A series of gas-sparging tests was performed by first sparging ("bubbling") gas mixtures in a well fitted with a "straddle" packer and then periodically sampling groundwater from the same well to develop concentration profiles and to estimate transformation rate coefficients. Evidence that gas-sparging of propane (or methane) and oxygen had stimulated organisms expressing a propane (or methane) monooxygenase enzyme system and the capability to transform TCE and cis-DCE included: (1) the transformation of sparged ethylene and propylene to their corresponding cometabolic by-products, ethylene oxide and propylene oxide, (2) the transformation of both cis-DCE and TCE in the propane-sparged well, (3) the transformation of cis-DCE in the methane-sparged well, and (4) the inhibition of ethylene and propylene transformations in the presence of acetylene, a known monooxygenase inactivator. At a well sparged with propane, first-order rate coefficients for propane utilization and ethylene and propylene transformation were similar, ranging from 0.007 to 0.010 h(-1). At the well sparged with methane, the propylene first-order transformation rate coefficient was 0.028 h(-1), a factor of 1.8 and 1.6 greater than methane and ethylene, respectively. The results demonstrated that gas-sparging tests are a rapid, low-cost means of assessing the potential for the in situ aerobic cometabolism of cis-DCE and TCE. (C) 2008 Elsevier Ltd. All rights reserved.
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