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Process modeling of NH3 contaminated waste air treatment in photocatalytic reactor using TiO2 coated glass tubes

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Author(s): Prukraya Pongyeela | Juntima Chungsiriporn | Pornsiri Kaewpradit | Lek Sikong

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 35;
Issue: 3;
Start page: 361;
Date: 2013;
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Keywords: RSM | ammonia | photocatalytic | TiO2 | UV light

ABSTRACT
Ammonia (NH3) is a noxious gas that can cause serious damage to human health and to the environment. Thus, elimination of NH3 in waste air by treating before releasing to the atmosphere is necessary. In this study, titanium dioxide (TiO2) nanoparticle Degussa P25 coating on glass cylindrical tube supporters was synthesized and used as photocatalytic in a continuous photoreactor device. UV light source was vertically installed around the photoreactor in a stainless steel chamber. Experiments were designed and conducted based on central composite design (CCD) and analyzed using response surface methodology (RSM). This RSM was used to evaluate the effects of process variables and their interactions towards attainment of their optimum conditions. Three significant variables, light intensity (23-114W/m2), waste air flow rate (1-5 l/min), and TiO2 loading (1.18-5.90 g) were fitted in a quadratic model to the response of NH3 treatment efficiency. R2 of 0.9783 wassatisfactorily evaluated for correlation coefficient of the quadratic model on the photocatalytic reactor. Based on statisticalanalysis, the NH3 treatment model has been proven to be highly significant with very low probability values (
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