Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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A Study on the Sludge-reduced Sewage Treatment Process Combined with Sludge Solubilization Technique Using Alkalophiles

호알칼리미생물을 이용한 슬러지감량형 하수처리공정 연구

  • 신경숙 ((주)한화건설 기술연구소) ;
  • 김윤석 ((주)한화건설 기술연구소) ;
  • 한대훈 ((주)한화건설 기술연구소) ;
  • 한운우 (대전대학교 토목공학과) ;
  • 이영하 (충남대학교 생명과학부) ;
  • 허형우 ((주)한화건설 기술연구소)
  • Received : 2007.10.22
  • Accepted : 2007.12.13
  • Published : 2007.12.15
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Abstract

Recently, one of the most interesting topic in the field of wastewater treatment is the disposal of excess sludge. The new concept of excess sludge reduction with recirculation of solubilized sludge via effective microorganisms for cell disruption within the wastewater treatment process has been developed in this study. The alkalophiles for degradation of sludge cell wall were isolated as Exiguobacterium sp., which could be more effectively solubilized sludge in the anaerobic condition. The SCOD of solubilized excess sludge by Exiguobacterium sp. was up to about 2,000mg/L and average TN and TP concentration of solubilized component were 117mg/L and 58mg/L, respectively and C/N ratio was more than 17. To investigate the effects of solubilized sludge by alkalophiles on excess sludge reduction and nutrient removal efficiency, the pilot plant of $DF^{(S)}-MBR$ process, combined with membrane bioreactor and sludge solubilization tank, was operated. In the control run(without sludge solubilization), the daily sludge production was about 4.54 kgMLVSS/day. However, in the $DF^{(S)}-MBR$(with sludge solubilization), the daily sludge production was decreased to 1.39kgMLVSS/day. The effluent quality satisfied the effluent regulation in both cases. Furthermore, the $DF^{(S)}-MBR$ showed relatively better TN removal efficiency in spite of high influent loading. So we concluded that the solubilized excess sludge by alkalophiles was effectively degraded in the MBR process as the carbon source and 70% of sludge reduction efficiency can be achieved.

Keywords

Acknowledgement

Supported by : 환경부

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