Mathematical Model for Electroosmotic Dewatering of Activated Sludge  

作　　者：于晓艳 张书廷 郑磊 刘勇 徐晖 

机构地区：[1]School of Environmental Science and Engineering, Tianjin University

出　　处：《Transactions of Tianjin University》2011年第1期39-44,共6页天津大学学报（英文版）

基　　金：Supported by Tianjin Research Program of Application Foundation and Advanced Technology(No. 09JCYBJC08200)

摘　　要：The mechanical dewatering of activated sludge is difficult due to its high compressibility, which can be improved by electroosmosis. In electroosmosis, direct electric field is applied to sludge cake. Based on the conductivity modes of different sludge beds, a model is presented in which sludge cake consists of two series parts in the circuit: a dewatered bed and an undewatered one. The dewatered bed called solid conductor is mainly made up of immovable water and sludge particles. The undewatered bed includes movable water and solid conductor, which are connected in parallel in the circuit. The model describes the variation of water content with time and electric power consumption as a function of water content in sludge cake, and interprets the reason for the variation of electroosmotic dewatering rate. Comparison with the experimental data for electroosmotic dewatering under constant voltage supports the validity of the model.The mechanical dewatering of activated sludge is difficult due to its high compressibility, which can be improved by electroosmosis. In electroosmosis, direct electric field is applied to sludge cake. Based on the conductivity modes of different sludge beds, a model is presented in which sludge cake consists of two series parts in the circuit： a dewatered bed and an undewatered one. The dewatered bed called solid conductor is mainly made up of immovable water and sludge particles. The undewatered bed includes movable water and solid conductor, which are connected in parallel in the circuit. The model describes the variation of water content with time and electric power consumption as a function of water content in sludge cake, and interprets the reason for the variation of electroosmotic dewatering rate. Comparison with the experimental data for electroosmotic dewatering under constant voltage supports the validity of the model.

关 键 词：electroosmotic dewatering activated sludge CONDUCTIVITY electric power consumption 

分 类 号：X703[环境科学与工程—环境工程]