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FIRST BIOREACTOR PILOT STUDY OF IN SITU BIOGEOCHEMICAL TRANSFORMATION IN CHINA FOR REMEDIATION OF CHLORINATED ETHENES CONTAMINATED GROUNDWATER AND ITS MICROBIAL INSIGHTS
Ding, W., H. Zhang, X. Ren, and H. Shan.
Journal of Water Process Engineering 81:109228(2026)
Filed Under: Demonstrations
Filed Under: Demonstrations
In situ biogeochemical transformation (ISBGT), consisting of a reaction pit filled with remedial amendments coupled with recirculation pipelines to increase hydraulic retention time and sustain favorable geochemical conditions, was implemented at a chlorinated ethene- contaminated site. Over 180 days, PCE and TCE declined by 98% with limited cis-DCE and VC accumulation, suggesting near-complete dechlorination. ISBGT operation led to a substantial drop in redox potential (-50 to -420 mV), creating reducing conditions favorable for iron and sulfur cycling. Metagenomic analysis revealed a temporal shift in functional potential, beginning with carbohydrate hydrolysis, followed by enhanced protein fermentation and acetate/H2 generation. Genes associated with redox iron and sulfur cycling, including mtrCDE and pilABC, increased notably. These processes facilitated the formation of biogenic iron sulfide (Fe-S) minerals, which likely played a central role in the abiotic reduction of PCE and TCE. ISBGT created a geochemically favorable environment where microbial metabolism continuously regenerated reactive Fe-S minerals, enabling sustained and synergistic CVOC degradation under highly reducing conditions. https://www.sciencedirect.com/science/article/pii/S2214714425023013/pdfft?casa_token=wnwU2b0IXrcAAAAA:Ou8KqKFgvKHKUGRrTdYrHcOAPdtvFtGAbU4pytaXozt5jyVFTjx4rtvs9Qmv4bSWV52VZDcNVg&md5=89678c7dce76cc34ffaf349ea60d54e1&pid=1-s2.0-S2214714425023013-main.pdf
Journal of Water Process Engineering 81:109228(2026)
Filed Under: Demonstrations
Filed Under: Demonstrations
In situ biogeochemical transformation (ISBGT), consisting of a reaction pit filled with remedial amendments coupled with recirculation pipelines to increase hydraulic retention time and sustain favorable geochemical conditions, was implemented at a chlorinated ethene- contaminated site. Over 180 days, PCE and TCE declined by 98% with limited cis-DCE and VC accumulation, suggesting near-complete dechlorination. ISBGT operation led to a substantial drop in redox potential (-50 to -420 mV), creating reducing conditions favorable for iron and sulfur cycling. Metagenomic analysis revealed a temporal shift in functional potential, beginning with carbohydrate hydrolysis, followed by enhanced protein fermentation and acetate/H2 generation. Genes associated with redox iron and sulfur cycling, including mtrCDE and pilABC, increased notably. These processes facilitated the formation of biogenic iron sulfide (Fe-S) minerals, which likely played a central role in the abiotic reduction of PCE and TCE. ISBGT created a geochemically favorable environment where microbial metabolism continuously regenerated reactive Fe-S minerals, enabling sustained and synergistic CVOC degradation under highly reducing conditions. https://www.sciencedirect.com/science/article/pii/S2214714425023013/pdff
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