Nanoparticles in wastewater from a science-based industrial park-Coagulation using polyaluminum chloride

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Original languageEnglish
Pages (from-to)1009-1014
Journal / PublicationJournal of Environmental Management
Issue number4
Publication statusPublished - Dec 2007
Externally publishedYes


The Hsinchu Science-based Industrial Park (HSIP) is the hi-tech manufacturing hub of Taiwan. Wastewater from the HSIP contains numerous nano-sized silicate particles whose size distributions peak at 2 and 90 nm. A 3-5 mg l-1 as Al dose of polyaluminum chloride (PACl) was used in the field to coagulate these particles, but the removal efficiency was low. Laboratory scale tests indicated that although PACl coagulation removed 52% of the turbidity and 48% of the chemical oxygen demand (COD) from water, its effect on nano-particle removal was minimal. About 58% of the soluble COD was associated with colloidal Si particles. A light scattering test and transmission electron microscopy (TEM) demonstrated that the nano-particles agglomerated in approximately linear aggregates of sizes 100-300 nm. Prolonged contact between residual PACl and the nano-particles generated large aggregates with sizes of up to 10 μm and a fractal dimension of 2.24-2.63. The results presented herein should be of interest in the processing of "high-tech" wastewater that contains nanosized silica particles. © 2006 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Coagulation, Fractal dimension, Nano-particles, Removal

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