Many techniques were proposed for removal of ammonia as hazardous pollutant. Adsorption of ammonia from aqueous solutions onto activated carbon (prepared from rice straw as agricultural waste by calcination then activation with sodium hydroxide) was studied in batch reactor. Comparison of linear least-squares and trial-and-error nonlinear methods of widely used isotherms (Langmuir, Freundlich, and Redlich-Peterson) was examined. Results manifest that adsorption rate increases with temperature for calcination and activation. Maximum adsorption capacity of prepared activated carbon is96.4 mg.g …………………………………………………………………………………………………….... Introduction:-Different governments adopted new regulations in order to control pollutant emissions. Among them, ammonia is considered an important health hazard because it is poisonous if inhaled in great quantities (breathing levels above 50-100 ppm) while it can cause eyes, throat and nose irritation in lesser concentrations. Actual ammonia emissions are generated mainly from the fertilizer manufacture industry, coke manufacture, fossil fuel combustion, livestock and poultry management, and refrigeration methods. Among all these sources, fertilizers production accounts for about 90%of total ammonia emissions (Gonçalves et al.,2011).Many techniques have been proposed in the literature for the removal of NH 3 in industrial effluents. These include absorption by solution, reaction with other gases, ion exchange using polymeric resins, separation using membranes, thermal treatment, catalytic decomposition and adsorption by porous solids which are economically convenient for high concentration pollutants (Pez et al.,1988;Blonigen, et al., 2003;Blonigenet al.,2005;Yunlong et al.,2015;Jared et al., 2016 ).Some of these techniques (e.g. thermal combustion) are they become economically unviable for diluted waste streams. For these special cases adsorption on porous solids (e.g. activated carbons, zeolites, and so on) can be an excellent approach (Huang et al.,2008; Kim, and Park,2007;Le Leuch, and Bandosz, 2007; Park and Jin,2005;Petit and Bandosz, 2009; Zawadzki et al.,2003;Bernal, et al., 1993; Bandosz and Petit,2009;Grant et al.,2012).Among the different porous solids described in the literature, activated carbons exhibit certain advantages such as a high "apparent" surface area, a highly developed porous structure in order to adapt it for a special application, in addition to its simplicity and economy in configuration and operation.
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