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.
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Research Article| May 01 2006
Study of different methods for enhancing the nitrate removal efficiency of a zero-valent metal process
Water Sci Technol (2006) 53 (11): 81–87.
S.F. Cheng, C.Y. Huang, J.Y. Liu; Study of different methods for enhancing the nitrate removal efficiency of a zero-valent metal process. Water Sci Technol 1 May 2006; 53 (11): 81–87. doi: https://doi.org/10.2166/wst.2006.340
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