Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Pretreatment Characteristics and Specific Methanogenic Activity of Municipal Sewage Sludge by Dual Frequency Sonication

이중주파수 초음파를 이용한 도시하수슬러지의 전처리 특성 및 비메탄활성도에 관한 연구

  • Jung, Byung-Gil (Department of Environmental Engineering, Dong-A University) ;
  • Jang, Seong-Ho (Department of Environmental Engineering, Pusan National University) ;
  • Sung, Nak-Chang (Department of Environmental Engineering, Dong-A University)
  • Published : 2007.02.28
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Abstract

The objectives of this study have been carried out to investigate the solubilization of municipal sewage sludge by single and dual frequency ultrasonic pretreatment, and the methane production characteristics of pretreated sewage sludge by specific methanogenic activity test for sewage sludge reduction. The waste activated sludge was collected from thickened tank of Suyoung sewage treatment plant in Busan city, and its concentration was adjusted to 1.0% total solids. Ultrasonic frequency was varied 15, 20, 15+20 kHz, and acoustic density was used a maximum 176W/L. The dual frequency ultrasonic pretreatment was found to be more effective than single frequency ultrasonic in the solubilization rate and methane production. The $SCOD_{Cr}/TCOD_{Cr}$, rate were 15.2%, 13.9%, 17.0% with single frequency of 15 kH2, 20 kHz, dual frequency of 15+20 kHz, respectively. The application of dual frequency ultrasound for sewage sludge pretreatment can be interest for sewage treatment plants having problems in sludge treatment and disposal.

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