Comparison of Sewage Sludge Solubilization through Different Pretreatment Methods

전처리 방법에 따른 하수슬러지 가용화 비교연구

  • 권재현 (인제대학교 환경시스템학부) ;
  • 김봉준 ((주) 아쿠아텍) ;
  • 김민규 (김해시 시설관리공단) ;
  • 염익태 (성균관대학교 토목환경공학과) ;
  • 김형수 (성균관대학교 토목환경공학과)
  • Received : 2003.06.02
  • Accepted : 2003.07.15
  • Published : 2003.08.15

Abstract

The pretreatment process was carried out to solubilize the sewage sludge for enhancing its biodegradability using alkaline treatment, ultrasonic treatment(15kHz), ozone treatment and different combination of these three methods: alkaline followed by ultrasonic as well as ozone, and ultrasonic followed by alkaline. The solubilization efficiency was evaluated based on the SCOD/TCOD ratio and VSS/TS ratio. In results, the proper condition of alkaline treatment was shown as 30meq/l of NaOH, pH 12 and 3hours of reaction time. Solubilization efficiency increased to 17% from initial 2% based on SCOD/TCOD ratio under this condition. In ultrasonic treatment, the higher ultrasonic power, the longer treatment time and the lower sludge volume resulted in higher solubilization respectively. There was a rapid increase in solubilization efficiency after 20 minute, then it was measured as 32% of SCOD/TCOD ratio in 1 hour at a ultrasonic power of 1,300W with 1/sludge. Solubilization efficiencies in combined treatment using alkaline and ultrasonic were 47-53% higher than single treatment at a sonicated time of 1 hour. Ozone treatment followed by alkaline treatment also represented the enhanced solubilization compared to ozone treatment. Therefore, ultrasonic or ozone treatment assisted by alkaline could achieve the short treatment time as well as high solubilizetion efficiency.

Keywords

References

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