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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front.Environ.Sci.Eng.    2010, Vol. 4 Issue (1) : 102-107    https://doi.org/10.1007/s11783-010-0001-z
Research articles
Possible solutions for sludge dewatering in China
Wei WANG1,Yuxiang LUO1,Wei QIAO2,
1.Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China; 2.College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;
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Abstract In China, over 1.43×107 tons of dewatered sewage sludge, with 80% water content, were generated from wastewater treatment plants in 2007. About 60% of the COD removed during the wastewater treatment process becomes concentrated as sludge. Traditional disposal methods used by municipal solid waste treatment facilities, such as landfills, composting, or incineration, are unsuitable for sludge disposal because of its high water content. Disposal of sludge has therefore become a major focus of current environmental protection policies. The present status of sludge treatment and disposal methodology is introduced in this paper. Decreasing the energy consumption of sludge dewatering from 80% to 50% has been a key issue for safe and economic sludge disposal. In an analysis of sludge water distribution, thermal drying and hydrothermal conditioning processes are compared. Although thermal drying could result in an almost dry sludge, the energy consumption needed for this process is extremely high. In comparison, hydrothermal technology could achieve dewatered sewage sludge with a 50%–60% water content, which is suitable for composting, incineration, or landfill. The energy consumption of hydrothermal technology is lower than that required for thermal drying.
Keywords sewage sludge disposal      water content      thermal drying      hydrothermal conditioning      
Issue Date: 05 March 2010
 Cite this article:   
Wei WANG,Wei QIAO,Yuxiang LUO. Possible solutions for sludge dewatering in China[J]. Front.Environ.Sci.Eng., 2010, 4(1): 102-107.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0001-z
https://academic.hep.com.cn/fese/EN/Y2010/V4/I1/102
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