Adsorption and photocatalytic oxidation of simulated instant coffee effluent using lahar- immobilized titanium dioxide in ultravilolet light

Date

4-2011

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Ramer P. Bautista

Co-adviser

Erlinda L. Mari

Committee Member

Jovita L. Movillon, Marilyn C. Del Barrio

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Abstract

The study focused on the adsorption and photocatalytic degradation of simulated instant coffee wastewater using lahar-immobilized TiO2 as adsorbent-hotocatalyst. The immobilization capacity of lahar was also investigated. The study determined the effect of lahar loading, lahar particle size, and sonication of titania slurry on the immobilization capacity of lahar. Boil deposition process was employed to let titanium dioxide adhere on the surfaces of lahar. It was found out that lahar particle size of mesh 20/30 had more adherence capability than mesh 30/60 and mesh 10/20. For lahar loading, no trend was seen due to the compaction of lahar and the limited size of the container. On the effect of sonication, it was found out that there was no significant difference in terms of immobilization capacity of lahar based on whether the TiO2 slurry used is sonicated or not. The percent color reduction of the combined effects of photocatalysis and adsorption was explored. Factors affecting the color reduction rate such as organic loading, mesh size of the adsorbent-photocatalyst and effect of added H2O2 were determined. Lower organic loadings proved to exhibit higher reduction efficiency. For the mesh size of the adsorbent-photocatalyst, larger particle size had higher reduction rate. On the effect of H2O2, putting it in the wastewater dramatically increased the reduction rate of color due mostly to bleaching. Studying the individual effects of adsorption and photocatalysis showed that adsorption had a greater effect in the solids reduction efficiency than photocatalysis. Lastly, a dramatic decrease in the solid reduction efficiency of the photocatalyst was observed after being reused for several runs.

Language

English

LC Subject

Oxidation, Coffee, Lahar

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2011 E62 C67

Document Type

Thesis

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