Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Enhancement of Anaerobic Biodegradability using the Solubilized Sludge by the Cavitation process

Cavitation에 의해 가용화된 슬러지의 혐기성 생분해도 향상에 관한 연구

  • Kim, Dongha (Department of Civil and Env. Eng., Kookmin University) ;
  • Lee, Jaegyu (Department of Civil and Env. Eng., Kookmin University) ;
  • Jung, Euitaek (Department of Civil and Env. Eng., Kookmin University) ;
  • Jeong, Hoyoung (Department of Civil and Env. Eng., Kookmin University)
  • 김동하 (국민대학교 건설시스템공학부) ;
  • 이재규 (국민대학교 건설시스템공학부) ;
  • 정의택 (국민대학교 건설시스템공학부) ;
  • 정호영 (국민대학교 건설시스템공학부)
  • Received : 2011.11.25
  • Accepted : 2014.01.10
  • Published : 2014.02.15
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Abstract

In order to investigate the effective pretreatment methods in WAS(=waste activated sludge) solubilization, the values of SCOD yield per unit SS (SCOD/gSS.hr) were compared. After the hydrodynamic cavitation with pH of 12.5, SCOD increased to 7800 mg/L, SS decreased to 45 % and the solubilization rate was 29 %. Combination of alkality (pH 12.5) and the cavitation seems to be the optimal condition for sludge solubilization. After the cavitational pretreatment, efficiencies of anaerobic digestion of the unfiltered sludge(the control), raw sludge and pretreated sludge were evaluated with BMP(=biochemical methane potential) tests. For evaluation of the biodegradability characteristics of pretreated sewage sludge, the methane production has been measured for 6 months. The methane production of pretreated sludge increased 1.4 times than that of untreated sludge. The result indicates that the cavitationally pretreated sludge was a better biodegradability substrate in anaerobic condition compared to raw sludge. It is obvious that cavitational pretreatment could enhance not only solubilization but also biodegradability of WAS. In conclusion, cavitational pretreatment of WAS to convert the particulate into soluble portion was shown to be effective in enhancing the digestibility of the WAS.

Keywords

References

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