Possible solutions for sludge dewatering in China  

作　　者：Wei WANG Yuxiang LUO Wei QIAO 

机构地区：[1]Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084,China [2]College of Chemical Engineering,China University of Petroleum,Beijing 102249,China

出　　处：《Frontiers of Environmental Science & Engineering》2010年第1期102-107,共6页环境科学与工程前沿（英文）

基　　金：the National High Technology Research and Development Program of China(Grant No.2006AA06Z384).

摘　　要：In China,over 1.43×10^(7)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.

关 键 词：sewage sludge disposal water content thermal drying hydrothermal conditioning 

分 类 号：X70[环境科学与工程—环境工程]