Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Determination of BDOCrapid and BDOCslow using Batch Bio-reactor

회분식 생물반응기를 이용한 BDOCrapid와 BDOCslow 결정

  • Son, Hee-Jong (Water Quality Research Institute, Waterworks Headquarter) ;
  • Roh, Jae-Soon (Water Quality Research Institute, Waterworks Headquarter) ;
  • Kang, Lim-Seok (Dept. of Environmental Engineering, Pukyung National University)
  • 손희종 (부산광역시 상수도사업본부 수질연구소) ;
  • 노재순 (부산광역시 상수도사업본부 수질연구소) ;
  • 강임석 (부경대학교 환경공학과)
  • Received : 2004.04.14
  • Accepted : 2004.05.28
  • Published : 2004.07.30
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Abstract

In this study, biodegradable organic matter was divided into a rapidly biodegradable fraction($BDOC_{rapid}$) and a slowly biodegradable fraction($BDOC_{slow}$) for various waters with different types of DOC. These fractions($BDOC_{rapid}$ and $BDOC_{slow}$) were defined by using a shaking incubation method modified from Carlson's method. Also, in this study, optimum incubation time and accuracy were investigated to determine $BDOC_{rapid}$ and $BDOC_{slow}$. When suspended bacteria obtained from raw water and BAC effluent, or attached bacteria from BAC was respectively used as an inoculum, the difference in total BDOC($BDOC_{total}$) was minimal. Therefore, total BDOC was determined in 7~8 days by the shaking method, which is comparable with Servais's method by which BDOC was determined in 28 days. In addition, the difference of BDOC between these two methods was within 7%. Although $BDOC_{rapid}$ and $BDOC_{slow}$ were effectively determined by a method defined by Klevens, the difference in optimal incubation time was significant for different water samples. However, when using the shaking method, optimal incubation time for $BDOC_{rapid}$ was found to be 3 days, therefore, the $BDOC_{rapid}$ was defined as the difference between $DOC_0$ and $DOC_{3days}$, and $BDOC_{slow}$ was defined as the difference between $BDOC_{total}$ and $BDOC_{rapid}$. As a conclusion, for determining the fraction of BDOC using the shaking method, the concentrations of an inoculurns and optimal incubation times used in this study were very effective.

Keywords

References

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