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http://dx.doi.org/10.7857/JSGE.2022.27.3.041

Assessing the Role of Citric Acid in Denitrification of Nitrate in Slow-releasing Carbon Source Tablet  

Han, Kyungjin (Department of Environmental Engineering, Korea National University of Transportation)
Yeum, Yuhoon (Department of Environmental Engineering, Korea University)
Kim, Young (Department of Environmental Engineering, Korea University)
Kwon, Sooyoul (Department of Environmental Health, Korea National Open University)
Publication Information
Journal of Soil and Groundwater Environment / v.27, no.3, 2022 , pp. 41-49 More about this Journal
Abstract
This study utilized citric acid as a floating agent in biological denitrification process and assessed its role under different carbon supplying conditions. Several microcosm tests including citric acid active (CAA), precipitating tablet release active (PTRA) and floating tablet release active (FTRA) were conducted to evaluate nitrate denitrification efficacy. In CAA reactors, nitrate removal was accompanied by the formation of denitrification by-products such as nitrite and nitrous oxide, with the extent of nitrate removal being proportional to citric acid concentration. These results suggest that citric acid induced heterotrophic biological denitrification. PTRA reactor that incorporated CAA and the same electron donor showed a similar denitrification efficiency to CAA reactor. FTRA reactor, which contained the same amount of fumarate as PTRA, enhanced denitrification by 7% as compared to the PTRA reactor. The overall results of this work indicate that surplus citric acid can be efficiently utilized in heterotrophic denitrification.
Keywords
Heterotrophic nitrate denitrification; Citric acid; Carbon source/Electron donor; Slow release tablet;
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