Impacts of ultrasound on selective leaching recovery of heavy metals from metal-containing waste sludge
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Lab synthesized metal-bearing sludge (LSMS) was used in series of designed lab tests to evaluate impacts of ultrasound on selective separation of heavy metals through acid leaching. The tests eliminated the potential of induced bias generated by utilizing field sludge that were produced from different location sources. The results showed that metal pairs of Cu and Fe, Cu and Cr, and Cr and Fe inside LSMS could be practically separated with one metal being contained in a liquid phase and another in a solid phase through acid leaching processes enhanced by ultrasound. With assistance of ultrasound, the acid leaching demonstrated a more efficient segregation between metals within LSMS than a conventional leaching that doesn’t have ultrasonic enhancement, and the tests provided in a generic means that ultrasonically enhanced acid leaching could cost-efficiently recover heavy metals from metal-containing waste sludge.
KeywordsHeavy metal Waste sludge Ultrasound Leaching Separation
The authors are thankful to the Nature Science Foundation of China (20777020), the Enterprise-College-Institute Cooperative Project Foundation of Guangdong Province and Ministry of Education of China (2007B090400037), and the Science and Technology Planning Project Foundation of Guangzhou City (2008Z1-E481) for supporting this work.
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