Study of different methods for enhancing the nitrate removal efficiency of a zero-valent metal process

This study explores the effect of several enhancing methods, namely acid wash pretreatment, ultrasound treatment and addition of nickel catalyst on the nitrate removal efficiency of three zero-valent metals--iron, aluminium and zinc. It is hoped that by learning about the major reaction pathways of...

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Bibliographic Details
Published in:Water science and technology 2006-01, Vol.53 (11), p.81-87
Main Authors: Cheng, S F, Huang, C Y, Liu, J Y
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Aluminum - chemistry
Catalysis
Catalysts
Diffusion
Diffusion layers
Dye dispersion
Heavy metals
Industrial Waste
Iron - chemistry
Kinetics
Mass transfer
Metals
Metals - analysis
Metals - chemistry
Metals, Heavy
Methods
Nickel
Nitrate removal
Nitrates
Nitrates - analysis
Nitrogen - chemistry
Nutrient removal
Pretreatment
Removal
Thickness
Ultrasonics
Ultrasound
Water Pollutants, Chemical - analysis
Water Purification - methods
Zinc
Zinc - chemistry
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Summary:This study explores the effect of several enhancing methods, namely acid wash pretreatment, ultrasound treatment and addition of nickel catalyst on the nitrate removal efficiency of three zero-valent metals--iron, aluminium and zinc. It is hoped that by learning about the major reaction pathways of nitrate removal with zero-valent metals and the main factors influencing the reactivity of those zero-valent metals, optimum process conditions may be identified. The study results show that direct transfer of electrons is the major reaction pathway. Thus increasing a clean, fresh metal surface and decreasing the thickness of the diffusion layer to accelerate mass transfer are the main determinants of reaction rate. In the absence of a clean, fresh metal surface, the catalytic reaction of nickel becomes the primary removal pathway.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2006.340