Title: Application of γ-PGA as the primary carbon source to bioremediate a TCE-polluted aquifer: A pilot-scale study. 
Resource Type: document --> technical publication --> journal article 
Country: Taiwan, Republic of China 
Language(s): English
Year: 2019 
Author 1/Producer: Luo, S.G. 
Other Authors/Producers: S.C. Chen, W.Z. Cao, W.H. Lin, Y.T. Sheu, and C.M. Kao. 
Author / Producer Type: University research group / research institute 
Journal: Chemosphere 
Journal Web Link: http://  
Start Page: 124449 
End Page: 124449 
Volume: 237 
Publisher Country: United Kingdom 
Publisher web link (root): https://www.ncbi.nlm.nih.gov/pubmed/31376698
Article Weblink (=direct link): https://www.sciencedirect.com/science/article/pii/S004565351 ...  
EUGRIS Keyword(s): Contaminated land-->Remediation options-->In situ treatment technologies
Contaminated land-->Soil and groundwater processes-->Microbiology
Short description: 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.  
Submitted By: Professor Paul Bardos WhoDoesWhat?      Last update: 22/08/2019

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