Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Effects on Microbial Activity of Aerobic Granular Sludge (AGS) in High-Salinity Wastewater

고농도 염분함유 폐수가 호기성 그래뉼 슬러지의 미생물 활성도에 미치는 영향

  • Kim, Hyun-Gu (BlueBank Co., Ltd., Business incubator center, Myongji University) ;
  • Ahn, Dae-Hee (BlueBank Co., Ltd., Business incubator center, Myongji University)
  • Received : 2019.06.05
  • Accepted : 2019.06.28
  • Published : 2019.07.31
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Abstract

The purpose of this study was to evaluate the effect of high-salinity wastewater on the microbial activity of Aerobic Granule Sludge (AGS). Laboratory-scale experiments were performed using a sequencing batch reactor, and the Chemical Oxygen Demand (COD), nitrogen removal efficiency, sludge precipitability, and microbial activity were evaluated under various salinity injection. The COD removal efficiency was found to decrease gradually to 3.0% salinity injection, and it tended to recover slightly from 4.0%. The specific nitrification rate was 0.043 - 0.139 mg $NH_4{^+}-N/mg$ $MLVSS{\cdot}day$. The specific denitrification rate was 0.069 - 0.108 mg $NO_3{^-}-N/mg$ $MLVSS{\cdot}day$. The sludge volume index ($SVI_{30}$) ultimately decreased to 46 mL/g. The specific oxygen uptake rate decreased from an initial value 120.3 to a final value 70.7 mg $O_2/g$ $MLVSS{\cdot}hr$. Therefore, salinity injection affects the activity of AGS, causing degradation of the COD and nitrogen removal efficiency. It can be used as an indicator to objectively determine the effect of salinity on microbial activity.

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References

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