Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effect of ammonia nitrogen and microorganisms on the elevated nitrogenous biochemical oxygen demand (NBOD) levels in the Yeongsan river in Gwangju

광주지역 영산강의 NBOD 발생에 대한 암모니아성 질소 및 미생물 영향 연구

  • Jang, Dong (Department of Environmental Research, Health & Environment Research Institute of Gwangju) ;
  • Cho, Gwangwoon (Department of Environmental Research, Health & Environment Research Institute of Gwangju) ;
  • Son, Gyeongrok (Department of Environmental Research, Health & Environment Research Institute of Gwangju) ;
  • Kim, Haram (Department of Environmental Research, Health & Environment Research Institute of Gwangju) ;
  • Kang, Yumi (Department of Environmental Research, Health & Environment Research Institute of Gwangju) ;
  • Lee, Seunggi (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology) ;
  • Hwang, Soonhong (Yeongsangang River Water Environment Research Institute, National Institute of Environmental Research) ;
  • Bae, Seokjin (Department of Environmental Research, Health & Environment Research Institute of Gwangju) ;
  • Kim, Yunhee (Department of Environmental Research, Health & Environment Research Institute of Gwangju)
  • 장동 (광주광역시 보건환경연구원 환경연구부) ;
  • 조광운 (광주광역시 보건환경연구원 환경연구부) ;
  • 손경록 (광주광역시 보건환경연구원 환경연구부) ;
  • 김하람 (광주광역시 보건환경연구원 환경연구부) ;
  • 강유미 (광주광역시 보건환경연구원 환경연구부) ;
  • 이승기 (광주과학기술원 지구.환경공학부) ;
  • 황순홍 (국립환경과학원 영산강물환경연구소) ;
  • 배석진 (광주광역시 보건환경연구원 환경연구부) ;
  • 김연희 (광주광역시 보건환경연구원 환경연구부)
  • Received : 2022.02.07
  • Accepted : 2022.03.07
  • Published : 2022.04.15
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Abstract

The present study was performed to investigate the effects of NH3-N and nitrifying microorganisms on the increased BOD of downstream of the Yeongsan river in Gwangju. Water samples were collected periodically from the 13 sampling sites of rivers from April to October 2021 to monitor water qualities. In addition, the trends of nitrogenous biochemical oxygen demand (NBOD) and microbial clusters were analyzed by adding different NH3-N concentrations to the water samples. The monitoring results showed that NH3-N concentration in the Yeongsan river was 22 times increased after the inflow of discharged water from the Gwangju 1st public sewage treatment plant (G-1-PSTP). Increased NH3-N elevated NBOD levels through the nitrification process in the river, consequently, it would attribute to the increase of BOD in the Yeongsan river. Meanwhile, there was no proportional relation between NBOD and NH3-N concentrations. However, there was a significant difference in NBOD occurrence by sampling sites. Specifically, when 5 mg/L NH3-N was added, NBOD of the river sample showed 2-4 times higher values after the inflow of discharged water from G-1-PSTP. Therefore, it could be thought other factors such as microorganisms influence the elevated NBOD levels. Through next-generation sequencing analysis, nitrifying microorganisms such as Nitrosomonas, Nitroga, and Nitrospira (Genus) were detected in rivers samples, especially, the proportion of them was the highest in river samples after the inflow of discharged water from G-1-PSTP. These results indicated the effects of nitrifying microorganisms and NH3-N concentrations as important limiting factors on the increased NBOD levels in the rivers. Taken together, comprehensive strategies are needed not only to reduce the NH3-N concentration of discharged water but also to control discharged nitrifying microorganisms to effectively reduce the NBOD levels in the downstream of the Yeongsan river where discharged water from G-1-PSTP flows.

Keywords

Acknowledgement

본 연구는 2021년 환경부 "환경분야 시험검사의 국제적 적합성 기반구축사업"과 광주광역시 보건환경연구원 "연구지원 및 역량강화" 사업의 지원으로 수행하였습니다.

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