DOI: 10.5176/2251-189X_SEES16.15

Authors: Putri Faizura Megat Khamaruddin, M Azmi Bustam and A Aziz Omar

Abstract: Diisopropanolamine (DIPA) is one of the preferred amines for the removal of high concentration of carbon dioxide in natural gas. Wastewater contaminated with DIPA with enhanced chemical oxygen demand (COD) is generated during the periodic cleaning of the natural gas absorption towers. In order to meet the stringent environmental regulatory limits, the wastewater must be treated prior to disposal. Fenton’s oxidation is one technique that is capable of degrading recalcitrant pollutants under mild conditions. The data collection for the development of kinetic model used hydrogen peroxide dosage range of 0 to 1.6 M and ferrous ion dosage of 0 to 0.02 M. The experimental temperature was 25°C to 50°C. The reaction pH was set constant at 2.5. All the experiments were conducted in batch mode using synthetically prepared wastewater. The apparent order of reaction determined by using integral method was found to be second-order with respect to DIPA. A mechanism based reaction kinetic equation was developed using lumped rate constant and pseudo-steady-state of hydroxyl radicals was assumed. The developed kinetic model was validated with the experimental observations. The validation demonstrated a maximum variance of 3{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}, which means the developed kinetic equation, fits the experimental data well.

Keywords: Fenton’s oxidation, diisopropanolamine, kinetics

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