Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effects of organic/inorganic carbon source on the biological luxury-uptake of phosphorus by cyanobacteria Synechococcus sp.

남조류 Synechococcus sp.의 혐기-호기법에 의한 인 과잉섭취 효율에 미치는 유기/무기 탄소원의 영향

  • Yu, Mi-Yeong (Department of Applied Environmental Science, Kyung Hee University) ;
  • Kim, Yun-Ji (Department of Applied Environmental Science, Kyung Hee University) ;
  • Choi, Yun-Jeong (Department of Applied Environmental Science, Kyung Hee University) ;
  • Hwang, Sun-Jin (Department of Applied Environmental Science, Kyung Hee University)
  • 유미영 (경희대학교 일반대학원 환경응용과학과) ;
  • 김윤지 (경희대학교 일반대학원 환경응용과학과) ;
  • 최윤정 (경희대학교 일반대학원 환경응용과학과) ;
  • 황선진 (경희대학교 일반대학원 환경응용과학과)
  • Received : 2020.10.05
  • Accepted : 2020.11.11
  • Published : 2020.12.15
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Abstract

Biological phosphorus removal is accomplished by exposing PAO(phosphorus accumulating organisms) to anaerobic-aerobic conversion conditions. In the anaerobic condition, PAO synthesize PHB(polyhydroxybutyrate) and simultaneously hydrolysis of poly-p resulting phosphorus(Pi) release. In aerobic condition, PAO uptake phosphorus(Pi) more than they have released. In this study, cyanobacteria Synechococcus sp., which is known to be able to synthesize PHB like PAO, was exposed to anaerobic-aerobic conversion. If Synechococcus sp. can remove excess phosphorus by the same mechanism as PAO, synergistic effects can occur through photosynthesis. Moreover, Synechococcus sp. is known to be capable of synthesizing PHB using inorganic carbon as well as organic carbon, so even if the available capacity of organic carbon decreases, it was expected to show stable phosphorus removal efficiency. In 6 hours of anaerobic condition, phosphorus release occurred in both inorganic and organic carbon conditions but SPRR(specific phosphorus release rate) of both conditions was 10 mg-P/g-MLSS/day, which was significantly lower than that of PAO. When converting to aerobic conditions, SPUR(specific phosphorus uptake rate) was about 9 mg-P/g-MLSS/day in both conditions, showing a higher uptake rate than the control condition showing SPUR of 6.4 mg-P/g-MLSS/day. But there was no difference in terms of the total amount of removal. According to this study, at least, it seems to be inappropriate to apply Synechococcus sp. to luxury uptake process for phosphorus removal.

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References

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