Ammonium Cation Lab Report

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1 Introduction 1.1 Background of Ammonia Ammonia, as one of the major contaminant from both municipal and industrial waste water, is widely found in aquatic systems. Ammonia nitrogen refers to the nitrogen existed in terms of ammonium cation, which is ionized and formed by the protonation of ammonia (NH3), and the dissolved ammonia (NH3-N). The main sources of ammonia nitrogen in water are decomposition of biomass, discharge of treated and untreated wastewater, and excessive chemical fertilizers used in agriculture. Varying from 5 to 1000mg/L, the ammonia concentration results from industrial emission of waste water such as chemical fertilizer, coal gasification, petroleum refining, pharmaceutical and catalyst factories [1]. For the municipal…show more content…
The membrane contactor itself does not have the function of separating, but it provides an interface for the mass transfer between two liquid solutions. For membrane absorption and desorption of ammonia, the membrane contactor functions as an integrated device, whose efficiency is actually the combination of a large ammonia stripping tower and an acid absorption tower, in which the physical separation and chemical absorption of ammonia could be achieved at the same…show more content…
The membrane used in gas absorption is generally a microporous and hydrophobic polymer. Commonly, the membrane materials for ultrafiltration, microfiltration, and reverse osmosis, such as polypropylene (PP), polytetrafluoroethylen (PTFE), and polyvinyl fluoride (PVDF), could be applied in membrane absorption process. Microporous membrane, whose aperture is between 0.1 and 10 micron, is a porous continuous medium that can screen and filter the molecular penetrated. Polypropylene is among the most widely used for its good resistance to high temperature, high pressure, and the corrosion from acid, alkali and organic. Since the membrane is hydrophobic, it could prevent aqueous solution in the gas/liquid separation. The parameters of microporous membrane include hydrophobicity, aperture distribution, porosity, curvature, and wall thickness. These characteristics could be quite different and thus influence the efficiency of membrane

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