Lee, Da-won Ahn, Yongtae Pandi, Kalimuthu Park, Joonhong Yun, Seong-Teak Jang, Min Choi, Jaeyoung 2024-01-19T14:02:26Z 2024-01-19T14:02:26Z 2022-01-10 2021-08-01 0048-9697 https://pubs.kist.re.kr/handle/201004/116597 In this study, the natural attenuation potential and biogeochemical analysis of nitrate contaminated bedrock aquifers by injection of carbon sources was evaluated. The denitrification capacity was assessed by injecting different carbon sources (succinate, acetate, fumarate) into the groundwater. Acetate was identified as the optimum source of electron donors for microbial metabolic processes, as it improved the effect of nitrate removal and microbial activity in the groundwater. In addition, when acetate was injected with a C/N ratio = 2.1:1, the ratio of denitrifying bacteria was the greatest (C/N 2.1 (2.1%) > C/N 4.2 (1.9%) > C/N 7.0 (0.9%) > control (0.7%)). Reflecting the geochemical characteristics of the bedrock aquifer environment, acetate was injected into groundwater at the research site to activate biological heterotrophic denitrification. As a result, the nitrate reduction rate was 0.377 g-N/day (YP-3), while the rate in groundwater unaffected by acetate was significantly lower, at 0.028 g-N/day (YP-4) over the same reaction time. In particular, the ratio of Dechloromonas denitrificans sp., which is a representative denitrification bacteria involved in anaerobic reduction of nitrate, increased (before injection: 0.0089%, after injection: 1.3067%). Expression of the nosZ gene, which is involved in the denitrification pathway (N2O -> N-2), increased from 4.82 Log (gene copies L-1) to 9.71 Log (gene copies L-1). Together, these results demonstrate that denitrification in bedrock aquifers can be activated by injection of carbon sources and identified the genetic reason for that denitrification. (C) 2021 Elsevier B.V. All rights reserved. English ELSEVIER DENITRIFYING BACTERIA NOSZ GENES DENITRIFICATION COMMUNITY GROUNDWATER INHIBITION ANAMMOX NIRK Evaluation of natural attenuation-potential and biogeochemical analysis in nitrate contaminated bedrock aquifers by carbon source injection Article 10.1016/j.scitotenv.2021.146459 1 SCIENCE OF THE TOTAL ENVIRONMENT, v.780 SCIENCE OF THE TOTAL ENVIRONMENT 780 scie scopus 000653087900003 2-s2.0-85103242087 Environmental Sciences Environmental Sciences & Ecology Article DENITRIFYING BACTERIA NOSZ GENES DENITRIFICATION COMMUNITY GROUNDWATER INHIBITION ANAMMOX NIRK Nitrate Bedrock aquifer Natural attenuation Denitrification Functional enzyme (nirS, nosZ) Microbial community