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2022 Vol.27, Issue 3 Preview Page
Assessing the Role of Citric Acid in Denitrification of Nitrate in Slow-releasing Carbon Source Tablet

완효성 탄소원 정제 내 citric acid의 생물학적 탈질소화 영향

Kyungjin Han1
,
Yuhoon Yeum2
,
Young Kim2
,
Sooyoul Kwon3*
한경진 1
,
염여훈 2
,
김영 2
,
권수열 3*
1Department of Environmental Engineering, Korea National University of Transportation, Chungcheongbuk-do 27469, Korea
2Department of Environmental Engineering, Korea University, Sejong 30019, Korea
3Department of Environmental Health, Korea National Open University, Seoul 03087, Korea
1한국교통대학교 환경공학과
2고려대학교 환경시스템공학과
3한국방송통신대학교 보건환경학과
*Corresponding Author
30 June 2022. pp. 41-49
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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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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 27
  • No :3
  • Pages :41-49
  • Received Date : 2022-05-24
  • Revised Date : 2022-05-24
  • Accepted Date : 2022-06-21
  • DOI :https://doi.org/10.7857/JSGE.2022.27.3.041
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