Design, Fabrication, and Preliminary Testing of a Tangential Plug Flow Reaction for the Decolorization of Simulated Annatto (Bixa orellana L.) Wastewater

Author : Enriquez, Earnest Frances Gamido
Major Adviser : Bautista, Ramer P. 
Committee Members : Guerrero, Gino Apollo M.; Migo, Veronica P.; Movillon, Jovita A. 
Year : 2018
Month : June
Type : Thesis
Degree: BS
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A tangential plug flow reactor was designed, fabricated and tested based on the flask experiment involving a decolorization reaction. Simulated natural dye wastewater from annatto was treated using homogenous oxidation process in order to determine the effect of three factors (hydrogen peroxide (H₂O₂) concentration, initial dye concentration, and temperature), including their interactions, on percent decolorization of the wastewater. Two-level factorial design with two replicates and four center points was employed to screen significant factors. Results showed that all factors were significant, as well as the interactions of temperature and H₂O₂ concentration, and temperature and initial dye concentration. Kinetics study was employed and the data was fitted into a 2nd order reaction, and rate constants of -0.1102 ppm⁻¹min⁻¹, and -0.3056 ppm⁻¹min⁻¹ were solved for 25 ̊C and 50 ̊C respectively. The reactor was tested by using the similar runs of the flask experiment. The reactor runs garnered an average value of 96.75 % decolorization, with all responses over 90 % decolorization; compared to the average value of 93.58 % decolorization on the flask experiment. Space time values for the reactor were also computed to be 30.88mins and 16.02 mins for 25 ̊C and 50 ̊C respectively. The efficiency of heating was also analysed. The equipment had a heat transfer efficiency of 95.64 %, with a % heat loss of 4.36 % and an overall heat transfer coefficient equal to 0.0981 BTU/hr-ft²- ̊F.

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