Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Evaluation of Biomass of Biofilm and Biodegradation of Dissolved Organic Matter according to Changes of Operation Times and Bed Depths in BAC Process

BAC 공정에서 운전기간 및 여층깊이 변화에 따른 생물막 생체량 및 용존유기물질 생분해 특성 평가

  • Son, Hyeng-Sik (Division of Policy Panning, Ulsan Technopark) ;
  • Jung, Chul-Woo (Division of Policy Panning, Ulsan Technopark) ;
  • Choi, Young-Ik (Dept. of Environmental Engineering, Dong-A University) ;
  • Lee, Gun (Dept. of Environmental Engineering, Dong-A University) ;
  • Son, Hee-Jong (Water Quality Institute, Water Authority)
  • 손형식 (울산 테크노파크 정책기획단) ;
  • 정철우 (울산 테크노파크 정책기획단) ;
  • 최영익 (동아대학교 환경공학과) ;
  • 이건 (동아대학교 환경공학과) ;
  • 손희종 (부산광역시 상수도사업본부 수질연구소)
  • Received : 2014.04.24
  • Accepted : 2014.05.23
  • Published : 2014.06.30
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Abstract

In this study we followed biofilm formation and development in a granular activated carbon (GAC) filter on pilot-scale during the 12 months of operation. GAC particles and water samples were sampled from four different depths (-5, -25, -50 and -90 cm from surface of GAC bed) and attached biomass were measured with adenosine tri-phosphate (ATP) analysis and heterotrophic plate count (HPC) method. The attached biomass accumulated rapidly on the GAC particles of top layer throughout all levels in the filter during the 160 days (BV 23,000) of operation and maintained a steady-state afterward. During steady-state, biomass (ATP and HPC) concentrations of top layer in the BAC filer were $2.1{\mu}g{\cdot}ATP/g{\cdot}GAC$ and $3.3{\times}10^8cells/g{\cdot}GAC$, and 85%, 83% and 99% of the influent total biodegradable dissolved organic carbon ($BDOC_{total}$), $BDOC_{slow}$ and $BDOC_{rapid}$ were removed, respectively. During steady-state process, biomass (ATP and HPC) concentrations of middle layer (-50 cm) and bottom layer (-90 cm) in the BAC filter were increased consistently. Biofilm development (growth rate) proceed highest rate in the top layer of filter (${\mu}_{ATP}=0.73day^{-1}$; ${\mu}_{HPC}=1,74day^{-1}$) and 78%~87% slower in the bottom layer (${\mu}_{ATP}=0.14day^{-1}$; ${\mu}_{HPC}=0.34day^{-1}$). This study shows that the combination of different analytical methods allows detailed quantification of the microbiological activity in drinking water biofilter.

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References

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