Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Bacterial Removal Efficiencies by Unit Processes in a Sewage Treatment Plant using Activated Sludge Process

활성슬러지공정 하수종말처리장의 단위공정별 세균 제거효율

  • Lee, Dong-Geun (Department of Pharmaceutical Engineering, Silla University) ;
  • Jung, Mira (Aging Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Sung, Gi Moon (Department of Microbiology, Graduate School, Daejeon University) ;
  • Park, Seong Joo (Department of Microbiology, Graduate School, Daejeon University)
  • 이동근 (신라대학교 제약공학과) ;
  • 정미라 (한국생명공학연구원 장수과학연구센터) ;
  • 성기문 (대전대학교 대학원 미생물학과) ;
  • 박성주 (대전대학교 대학원 미생물학과)
  • Received : 2010.05.07
  • Accepted : 2010.06.17
  • Published : 2010.09.30
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Abstract

To figure out the removal efficiency of indicator and pathogenic bacteria by unit processes of a sewage treatment plant using activated sludge process, analyses were done for incoming sewage, influent and effluent of primary clarifier, aeration tank, secondary clarifier and final discharge conduit of the plant. A matrix of bacterial items (average of bacterial reduction [log/ml], p value of paired t-test, number of decreased cases of twenty analyses, removal percentage only for decreased cases) between incoming sewage and final effluent of the plant were heterotrophic plate counts (1.54, 0.000, 20, 95.01), total coliforms (1.38, 0.000, 19, 83.94), fecal coliforms (0.90, 0.000, 20, 94.84), fecal streptococci (0.90, 0.000, 20, 98.08), presumptive Salmonella (0.23, 0.561, 7, 99.09), and presumptive Shigella (1.02, 0.002, 15, 92.98). Total coliforms, fecal coliforms, heterotrophic plate counts, and fecal streptococci showed highest decrease through secondary clarifier about 1-log (p<0.001) between 88% and 96%, and primary clarifier represented the significant (p<0.05) decrease. However, final effluent through discharge conduit showed higher total coliforms and fecal streptococci than effluent of secondary clarifier (p<0.05). In addition, final effluent once violated the water quality standard while effluent of secondary clarifier satisfied the standard. Hence some control measures including elimination of deposits in discharge conduit or disinfection of final effluent are necessary.

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