Browse > Article

Sludge Pre-Treatment by Hydrodynamic Cavitation-I: Optimization of Pre-Treatment System  

Maeng, Jang-Woo (Civil/Environmental/Geoinformatic Engineering, Inha University)
Lee, Eun-Young (Civil/Environmental/Geoinformatic Engineering, Inha University)
Bae, Jae-Ho (Civil/Environmental/Geoinformatic Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.12, 2010 , pp. 1119-1125 More about this Journal
Abstract
Most of the sludge pre-treatment methods to improve the anaerobic digestibility of sludge are not practied in the fields with low economical efficiency. The venturi cavitation system (VCS) adopting hydrodynamic cavitation is simple and requires low energy. This research was conducted to investigate the optimum design and operating conditions of the VCS. The experimental results indicated that the optimum number of venturi in series was three, and the suction mode operation of the pump yielded 1.6 times higher pre-treatment efficiency per unit energy consumption than the discharge mode. The combination of venturies with different throat sizes did not affect the pre-treatment efficiency. Also, the parallel installation of the three in series venture unit yielded 30% higher pre-treatment efficiency per unit energy consumption than the single unit. Under parallel conditions, the solubilization efficiency was 5.6 mg ${\Delta}SCOD/g$ TS/kWh, which is higher than the previously reported value.
Keywords
Sludge Pre-treatment; Cavitation; Hydrodynamic; Venturi; Solubilization;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Torres, M. L. and Llorens, M. C. E., "Effect of alkaline pretreatment on anaerobic digestion of solid wastes," Waste Management, 28, 2229-2234(2008).   DOI   ScienceOn
2 환경부. "하수도 통계-2008," 13(2009).
3 Harrison, S. T. L., "Bacterial cell disruption : A key unit operation in the recovery of intracellular products," Biotech. Adv., 9, 217-240(1991).   DOI   ScienceOn
4 Sawayama, S., Inoue, S., Yagishita, T., Ogi, T. and Yokoyama, S. Y., "Thermochemical liquidization anaerobic treatment of dewatered sewage sludge," J. Ferment. Bioeng., 79, 300-302(1995).   DOI   ScienceOn
5 Show, K. Y., Mao, T. and Lee, D. J., "Optimisation of sludge disruption by sonication," Water Res., 41, 4741-4747 (2007).   DOI   ScienceOn
6 Kampas, P., "Sidestream treatment for improved BNR performances," One year report, Cranfield University(2005).
7 Bae, J. H., Nguyen, D. X. and Kim, H. J., "The preformance of the sludge pretreatment system with venturi tubes," Water Sci. Technol., 57, 131-137(2008).   DOI   ScienceOn
8 APHA "Standard Methods for the Examination of Water and Wastewater," 20th ed. American Public Health Association, Washington D.C.(1998).
9 Kampas, P., "Sidestream treatment for improved BNR process performance," Ph. D. Thesis, Cranfield University (2007).
10 김동하, "Cavitation에 의한 슬러지 가용화와 PGA를 이용한 하수고도처리에 관한 연구," 대한상하수도학회지, 22(4), 449-454(2008).
11 맹장우, 배재호, "수리동력학적 및 초음파 캐비테이션 슬러지 전처리 장치의 비교 연구," 대한환경공학회지, 31(2), 90-95(2009).   과학기술학회마을
12 Dytczak, M. A., Londry, K. L., Siegrist, H. and Oleszkiewicz, J. A., "Ozonation reduces sludge production and improves denitrification," Water Res., 41, 543-550(2007).   DOI   ScienceOn
13 서울특별시. "서울특별시 4개 하수처리장 하수슬러지 처리시설 증설 기본계획 요약보고서," 93-103(2006).
14 Arrojo, S. and Benito, Y. "A theoretical study of hydrodynamic cavitation," Ultrason. Sonochem., 15, 203-211(2008).   DOI   ScienceOn
15 Chu, C. P., Chang, B. V., Liao, G. S., Jean, D. S. and Lee, D. J., "Observations on changes in ultrasonically treated waste-activated sludge," Water Res., 35, 1038-1046(2001).   DOI   ScienceOn