Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Sewage sludge solubilization using ultrasonic combined with calcium peroxide

초음파/과산화칼슘(US/CaO2)을 이용한 하수슬러지 가용화

  • Han, Jun-Hyuk (School of Civil & Environmental Engineering, Hankyong National University) ;
  • Nam, Se-Yong (School of Civil & Environmental Engineering, Hankyong National University)
  • 한준혁 (국립한경대학교 건설환경공학부) ;
  • 남세용 (국립한경대학교 건설환경공학부)
  • Received : 2021.11.12
  • Accepted : 2021.12.10
  • Published : 2021.12.30
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Abstract

In order to investigate the degree of sewage sludge solubilizaion using ultrasonic(US) combined with calcium peroxide(CaO2), VSS reduction rate, solubilization rate, SCOD/VSS ratio, SCOD increasing rate, LB-EPS(Loosely-Bound EPS) and TB-EPS(Tightly-bound EPS) were measured. US was compared as a control. Solubilization rate increased by 23.4% under US and increased by 50.7% under US/CaO2(0.05 g CaO2/g VSS). and also, at the same conditions, VSS reduction rate increased by 7.1% and 17.7%, respectively. SCOD increasing rate from 10 to 90 minutes was 0.0151 min-1 under US/CaO2(0.02 g CaO2/g VSS). TB-EPS decreased by 36.4% under US and decreased by 59.0% under US/CaO2(0.05 g CaO2/g VSS). TB-EPS decreased during first 10 minutes and then decreased slowly until 90 minutes. There was no significant difference in TB-EPS decrease according to the dosage of calcium peroxide.

초음파/과산화칼슘 처리(US/CaO2)에 따른 하수슬러지의 가용화 정도를 확인하고자 과산화칼슘의 주입량(0.01, 0.02, 0.03, 0.04 및 0.05 g CaO2/g VSS)에 따른 처리 효율을 비교하였다. 가용화의 주요 지표인 VSS 감량화율, 가용화율, SCOD/VSS, SCOD 증가속도 및 미생물의 세포벽이 파쇄되었는지 확인하기 위하여 LB-EPS와 TB-EPS를 측정하였다. 실험결과, US/CaO2(0.05 g CaO2/g VSS) 조건에서 가용화율은 50.7%로 US 처리(23.4%)보다 높은 효율을 나타내었으며, VSS 감량화율도 US/CaO2(0.05 g CaO2/g VSS) 조건에서 17.7%, US 조건에서는 7.1%로 가용화율과 유사한 경향을 나타내었다. 조사시간 10분부터 90분까지 SCOD의 증가속도는 US/CaO2(0.02 g CaO2/g VSS) 조건에서 0.0151 min-1으로 가장 빠른 속도를 나타내었다. TB-EPS는 US/CaO2(0.05 g CaO2/g VSS)조건에서 59.0%, US 조건에서 36.4% 감소하였다. TB-EPS는 초기 10분동안 빠르게 감소하였으며, 이후부터 상대적으로 완만하게 줄어드는 것을 확인할 수 있었다. 과산화칼슘의 주입량에 따른 TB-EPS의 감소량은 큰 차이가 없는 것으로 나타났다.

Keywords

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