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

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 coagul...

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Bibliographic Details
Published in:Journal of environmental management 2007-12, Vol.85 (4), p.1009-1014
Main Authors: Chang, M.R., Lee, D.J., Lai, J.Y.
Format: Article
Language:English
Subjects:
Aggregates
Aluminum Hydroxide - chemistry
Animal, plant and microbial ecology
Applied ecology
Applied sciences
Biological and medical sciences
Coagulation
Conservation, protection and management of environment and wildlife
Electronics industry
Environmental management
Exact sciences and technology
Fractal dimension
Fundamental and applied biological sciences. Psychology
General aspects
Hazardous waste
Industrial parks
Industrial waste
Industrial Waste - analysis
Location of industry
Microscopy, Electron, Transmission
Nano-particles
Nanoparticles
Nanoparticles - chemistry
Nanoparticles - ultrastructure
Pollution
Removal
Silica
Taiwan
Transmission electron microscopy
Waste Disposal, Fluid - methods
Waste management
Wastewaters
Water treatment
Water treatment and pollution
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Summary: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.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2006.11.013