A Long-Term Field Study of In Situ Bioremediation in a Fractured Conglomerate Trichloroethene Source Zone

被引:12
|
作者
Verce, Matthew F. [1 ]
Madrid, Victor M. [2 ]
Gregory, Steven D. [2 ]
Demir, Zafer [2 ]
Singleton, Michael J. [3 ]
Salazar, Edmund P. [4 ]
Jackson, Paul J. [4 ]
Halden, Rolf U. [5 ]
Verce, Anja [1 ]
机构
[1] Weiss Associates, Emeryville, CA 94608 USA
[2] Lawrence Livermore Natl Lab, Environm Restorat Dept, Livermore, CA USA
[3] Lawrence Livermore Natl Lab, Div Chem Sci, Livermore, CA USA
[4] Lawrence Livermore Natl Lab, Biosci & Biotechnol Div, Livermore, CA USA
[5] Arizona State Univ, Biodesign Inst, Tempe, AZ USA
关键词
rock; bioremediation; preferential flow; trichloroethene; Dehalococcoides; groundwater; rebound; tracer; isotopes; ENHANCED REDUCTIVE DECHLORINATION; DEHALOGENASE GENES; CLAY TILL; DEHALOCOCCOIDES; BIOAUGMENTATION; SCALE; WATER; REMEDIATION; GROUNDWATER; TETRACHLOROETHENE;
D O I
10.1080/10889868.2014.978836
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
ABSTRACT An 8-year bioremediation field study was conducted in a trichloroethene (TCE)-contaminated, highly indurated (i.e., hard), recharge-limited (i.e., contains little water) conglomerate where common remediation strategies, such as groundwater recirculation and direct push installation of a large well network, could not be used. A tracer test using isotopically distinct water from the Hetch Hetchy Reservoir indicated that remediation fluids mainly flowed through fractures and sand lenses in the conglomerate. This was confirmed during in situ bioremediation of the site, in which Dehalococcoides (from a bioaugmentation culture) and volatile fatty acids (from injection of lactate) were the most accurate indicators of transport between wells. Some contaminants were also displaced out of the area due to injection of tracer water. Despite these difficulties, dissolved contaminant mass decreased by an estimated 80% by the end of the test, reaching the lowest values ever recorded at this site. Furthermore, the persistence of ethene 4years after bioaugmentation suggests that the dechlorinating capacity of the remaining microbial community is comparable to the matrix diffusion of TCE into the dissolved phase.
引用
收藏
页码:18 / 31
页数:14
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