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dc.contributor.authorDen, Wen_US
dc.contributor.authorHuang, CPen_US
dc.date.accessioned2014-12-08T15:19:32Z-
dc.date.available2014-12-08T15:19:32Z-
dc.date.issued2005-03-10en_US
dc.identifier.issn0927-7757en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.colsurfa.2004.11.026en_US
dc.identifier.urihttp://hdl.handle.net/11536/13909-
dc.description.abstractContinuous-flow electrocoagulation process with vertical flow-channels was investigated as a method to treat synthetic chemical-mechanical-planarization (CMP) wastewater containing highly charged ultrafine silica particles (zeta = -55 mV, mean R-p = 45 nm at pH 9.5). The parallel-plate, monopolar electrochemical cells resembled a series of closed electrical circuits such that the electrical field strength was highly dependent of the current density and aqueous conductivity, but independent of the inter-electrode gap. The residual turbidity of the CMP wastewater decreased with the increases in either hydraulic retention time or applied current density, and removal efficiency as high as 95% was achieved for wastewater with both low (70NTU) and high (400 NTU) initial turbidities. The charge loading linearly correlated with turbidity removal efficiency up to a level of 8 F m(-3), presenting an appropriate design parameter. Further analysis indicated that turbidity removal was limited by the quantity of liberated ferrous ions at lower range of current density, but seemingly reached a critical level of current density beyond which the process performance gradually deteriorated. Comparisons between the effective particle retention time and the estimated electrophoretic migration time revealed that the electrocoagulation process was predominantly controlled by the rate of particle aggregation occurring near the anodic surfaces. Furthermore, this process generates lesser amount of dry sludge as compared to chemical coagulation with polyaluminum chloride, and does not require pH adjustment prior to treatment. (C) 2004 Elsevier B.V.. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectelectrocoagulationen_US
dc.subjectelectrochemicalen_US
dc.subjectparallel plateen_US
dc.subjectmonopolaren_US
dc.subjectsilica colloidsen_US
dc.subjectchemical-mechanical-planarizationen_US
dc.subjectCMP wastewater treatmenten_US
dc.titleElectrocoagulation for removal of silica nano-particles from chemical-mechanical-planarization wastewateren_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.colsurfa.2004.11.026en_US
dc.identifier.journalCOLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTSen_US
dc.citation.volume254en_US
dc.citation.issue1-3en_US
dc.citation.spage81en_US
dc.citation.epage89en_US
dc.contributor.department環境工程研究所zh_TW
dc.contributor.departmentInstitute of Environmental Engineeringen_US
dc.identifier.wosnumberWOS:000227030400012-
dc.citation.woscount29-
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