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APPLICATION OF γ -PGA AS THE PRIMARY CARBON SOURCE TO BIOREMEDIATE A TCE-POLLUTED AQUIFER: A PILOT-SCALE STUDY
Luo, S.G., S.C. Chen, W.Z. Cao, W.H. Lin, Y.T. Sheu, and C.M. Kao.
Chemosphere 237:124449(2019)

A pilot-scale study demonstrated the use of gamma poly-glutamic acid (γ-PGA) as a carbon and nitrogen source to bioremediate a TCE-contaminated aquifer. Groundwater samples collected from monitor and injection wells were analyzed for TCE and its byproducts, geochemical indicators, dechlorinating bacteria, and microbial diversity. The γ-PGA addition increased total organic carbon (up to 9820 mg/L), which subsequently biodegraded and caused anaerobic conditions within the aquifer. Up to 93% of TCE removal was observed (from 0.14 to 0.01 mg/L) 59 days after γ-PGA injection, and dechlorination of TCE by-products was also observed. Next-generation sequencing determined that the γ-PGA supplement developed reductive dechlorinating conditions and caused variations in microbial diversity and 4 groups of bacterial species, including dechlorinating bacteria, VC-degrading bacteria, hydrogen-producing bacteria, and carbon biodegrading bacteria.



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