期刊
ULTRASONICS SONOCHEMISTRY
卷 20, 期 6, 页码 1450-1455出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2013.03.006
关键词
Hydrodynamic cavitation; Ultrasonication; Sludge pretreatment; Waste-activated sludge (WAS); Anaerobic digestion; Methane production
资金
- National Research Foundation of Korea (NRF) [NRF-2012M1A2A2026587]
- Advanced Biomass R&D Center (ABC) of Korea [ABC-2012053875]
- Ministry of Education, Science and Technology
- National Research Foundation of Korea [2012M1A2A2026587, 2011-0031348] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Disintegration of waste-activated sludge (WAS) is regarded as a prerequisite of the anaerobic digestion (AD) process to reduce sludge volume and increase methane yield. Hydrodynamic cavitation (HC), which shares a similar underlying principle with ultrasonication but is energy-efficient, was employed as a physical means to break up WAS. Compared with ultrasonic (180-3600 kJ/kg TS) and thermal methods (72,000 kJ/kg TS), HC (60-1200 kJ/kg TS) found to consume significantly low power. A synergetic effect was observed when HC was combined with alkaline treatment in which NaOH, KOH, and Ca(OH)(2) were used as alkaline catalysts at pH ranging from 8 to 13. As expected, the production yield of CH4 gas increased proportionally as WAS disintegration proceeded. HC, when combined with alkaline pretreatment, was found to be a cost-effective substitute to conventional methods for WAS pretreatment. (C) 2013 Elsevier B.V. All rights reserved.
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