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염료 분해균 증대를 통한 Pilot Plant에서의 담체 내 미생물 생태와 색도처리에 미치는 영향

Effect of Dye-Degrading Microbes' Augmentation on Microbial Ecosystem of the Fluidizing Media and Color Treatment in a Pilot Plant

  • 김정태 (부산대학교 환경시스템학과) ;
  • 이건 (동아대학교 환경공학과) ;
  • 박도현 (부산패션칼라산업협동조합) ;
  • 강경환 (부경대학교 생물공학과) ;
  • 김중균 (부경대학교 생물공학과) ;
  • 이상준 (부산대학교 미생물학과)
  • Kim, Jung-Tae (Department of Environmental System, Pusan National University) ;
  • Lee, Geon (Department of Environmental Engineering, Dong-A University) ;
  • Park, Do-Hyeon (Busan Fashion Color Industry Cooperative) ;
  • Kang, Kyeong-Hwan (Department of Biotechnology and Bioengineering, Pukyong National University) ;
  • Kim, Joong-Kyun (Department of Biotechnology and Bioengineering, Pukyong National University) ;
  • Lee, Sang-Joon (Department of Microbiology, Pusan National University)
  • 투고 : 2013.08.13
  • 심사 : 2014.02.06
  • 발행 : 2014.04.30

초록

In a pilot-scale dyeing wastewater treatment using two-type fluidizing media, each thickness of biofilm was 15 and 30 ${\mu}m$, respectively. The numbers of protozoa inhabited in small-size (PEMT A) and big-size (PEMT B) media were $7.5{\times}10^4$ and $1.25{\times}10^5$ cells/ml, respectively, and dominant species were Entosiphon sulcatus var sulcatus in PEMT A and Chlamydomonas reinhardtii in PEMT B, respectively. Flask experiments using the two media revealed that the percentages of color removal were 25.8% in PEMT A and 27.1% in PEMT B after 72-h cultivation, indicating the necessity of bioaugmentation. Experiments for bioaugmentation effect on color removal were carried out in the pilot-scale treatment for 75 d by three-step operation under the control of wastewater loading rate and microbial input rate. Dye degradation occurred mainly in the second reaction tank, and the attachment of augmented dye-degrading microorganisms to media took at least 35 d. Final value of chromaticity in effluent was 227, meeting the required standard. Therefore bioaugmentation onto media was good for color treatment. In summary, thickness of biofilm formed on the media depended upon the size of media, resulting in different ecosystem inside the media. Hence, this affected microbial community and color treatment further. Accordingly, the reduction of operation cost is expected by efficient color-treatment process using bioaugmented media.

키워드

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