Mechanistic study on the continuous flow electrocoagulation of silica nanoparticles from polishing wastewater

Walter Den*, Ch-Hpin Huang, Hung Chieh Ke

*此作品的通信作者

研究成果: Article同行評審

41 引文 斯高帕斯(Scopus)

摘要

This study investigates the removal mechanisms involved in the monopolar, continuous-flow electrocoagulation of a polishing wastewater containing negatively charged silica particles. Using iron as the anodes, the mechanisms were inferred from the experimental observations of the changes in pH, zeta-potential, and turbidity as a function of reaction time, as well as from the sludge characterization. Two types of distinct mechanisms were observed, one involving particle destabilization by oppositely charged ferrous ions and the other involving coprecipitation or enmeshment of silica particles with the iron hydroxides. The former mechanism was apparently responsible for the formation of "surface flocs", whereas the latter one was responsible for the "sediment sludge". The sludge collected separately from the two "sinks" was distinctly different in both physical appearance and settling velocity. Furthermore, based on the sheer quantity of the surface floes and the sediment sludge, the two mechanisms involved in the electrocoagulation process were equally important to the silica removal.

原文English
頁(從 - 到)3644-3651
頁數8
期刊Industrial and Engineering Chemistry Research
45
發行號10
DOIs
出版狀態Published - 10 5月 2006

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