Banca de QUALIFICAÇÃO: VÁLBER RODRIGO RIBEIRO DE MEDEIROS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : VÁLBER RODRIGO RIBEIRO DE MEDEIROS
DATA : 09/09/2019
HORA: 14:00
LOCAL: CATRE
TÍTULO:

Photocatalytic degradation of organic matter in domestic sewage

PALAVRAS-CHAVES:

 

 Domestic Sewage; Removal of Organic Matter; Heterogeneous Photocatalysis; Kinetics.

PÁGINAS: 75
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
ESPECIALIDADE: Processos Orgânicos
RESUMO:

The current demand for water supplies faces the diminishing availability of water resources that can be used on a daily basis. In this case, treating domestic sewage is an indispensable task, as it enables the reuse of water for various purposes, as well as avoiding possible contamination of the environment and the population. Since sanitary sewage is composed mainly of organic matter, the present work proposes the use of heterogeneous photocatalysis for the degradation of these substances. To this end, a synthetic sewage solution was fed to a batch photocatalytic reactor under constant agitation and exposure to sunlight in order to define the best operating conditions with regard to the efficiency of the photocatalysts and their respective concentrations. TiO₂, WO₃ and Nb₂O₅ at concentrations of 0.25, 0.50, 0.75 and 1.0 mg L^-1 and pH set at 3.0 were tested to determine the best conditions for the reaction to occur. Aliquots were collected every 40 min for a total reaction time of 4 hours. The samples were filtered and had their biochemical oxygen demands analyzed. At the lowest concentration in study, Nb₂O₅ showed the best removal of organic matter, probably due to its higher capacity for contaminant adsorption. At the other concentrations, TiO₂ was more efficient, culminating in a removal of 40.93% at a concentration of 1.0 mg L^-1. The kinetic study indicates that the adjustment of pseudo first order reaction fits well with the results at all concentrations evaluated. The Langmuir-Hinshelwood model allowed obtaining equations to evaluate the photodegradation of reactions with TiO₂ and Nb₂O₅, although their adjustment was not adequate to the WO₃ data.

MEMBROS DA BANCA:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa ao Programa - 2668814 - MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
Externa à Instituição - SUYLAN LOURDES DE ARAÚJO DANTAS