Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process

doi:10.1016/S1004-9541(14)60062-8

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (4): 469-473.DOI: 10.1016/S1004-9541(14)60062-8

• ENERGY, RESOURCES AND ENVIRONMENTAL TECHNOLOGY • Previous Articles Next Articles

Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process

ZHANG Guangming¹, WAN Tian², GAO Feng², DONG Shan²

1 School of Environment & Natural Resource, Renmin University of China, Beijing 100872, China;
2 State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

Received:2012-08-25 Revised:2013-01-25 Online:2014-04-04 Published:2014-04-28
Supported by:
Supported by the Basic Research Funds in Renmin University of China from the center government (12XNL101).

Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process

张光明¹, 万甜², 高峰², 董姗²

1 School of Environment & Natural Resource, Renmin University of China, Beijing 100872, China;
2 State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

通讯作者: ZHANG Guangming
基金资助:
Supported by the Basic Research Funds in Renmin University of China from the center government (12XNL101).

Abstract

Abstract: The impact of ultrasonic power density on changes of heavy metals during sludge sonication was investigated. Results showed that ultrasound could release heavy metals from sludge into the supernatant. There existed an effective power density range of 0.8-1.6 W·ml^-1 for the release of the total heavy metal; there was little release below 0.8 W·ml^-1 and too high power density was adverse to the release. Furthermore, sonication showed selective release of heavy metal from sludge to the supernatant; copper, cadmium and lead were not released by sonication, while arsenic and nickel were released easily and their release ratio could reach 40%. The effective energy range for each heavy metal was also different that 0.8-1.2 W·ml^-1 for arsenic, 0.5-1.6 W·ml^-1 for nickel, and 0.8-1.6 W·ml^-1 for mercury and chrome. The differences among heavy metal release during sonication might be explained by the different distribution of chemical fractions of each metal in sludge. Such selectivity could be used to control heavy metal release during sludge treatment.

Key words: activated sludge, sonication, metals, power density, chemical fractions

摘要： The impact of ultrasonic power density on changes of heavy metals during sludge sonication was investigated. Results showed that ultrasound could release heavy metals from sludge into the supernatant. There existed an effective power density range of 0.8-1.6 W·ml^-1 for the release of the total heavy metal; there was little release below 0.8 W·ml^-1 and too high power density was adverse to the release. Furthermore, sonication showed selective release of heavy metal from sludge to the supernatant; copper, cadmium and lead were not released by sonication, while arsenic and nickel were released easily and their release ratio could reach 40%. The effective energy range for each heavy metal was also different that 0.8-1.2 W·ml^-1 for arsenic, 0.5-1.6 W·ml^-1 for nickel, and 0.8-1.6 W·ml^-1 for mercury and chrome. The differences among heavy metal release during sonication might be explained by the different distribution of chemical fractions of each metal in sludge. Such selectivity could be used to control heavy metal release during sludge treatment.

关键词: activated sludge, sonication, metals, power density, chemical fractions

ZHANG Guangming, WAN Tian, GAO Feng, DONG Shan. Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process[J]. Chin.J.Chem.Eng., 2014, 22(4): 469-473.

张光明, 万甜, 高峰, 董姗. Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process[J]. Chinese Journal of Chemical Engineering, 2014, 22(4): 469-473.

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Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process

Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process

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