Banca de DEFESA: PATRICIA NAZARÉ FERREIRA DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PATRICIA NAZARÉ FERREIRA DOS SANTOS
DATE: 29/07/2022
TIME: 14:00
LOCAL: meet.google.com/ivv- iqns-vcg
TITLE:

Modeling of airborne odour dispersion from textile effluents using AERMOD software.

KEY WORDS:

Odor; textile effluent; AERMOD; heterogeneous photocatalysis; nanomaterial.

PAGES: 82
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

Textile industries are considered one of the major responsible for water pollution, and emission of odor-causing gases, in addition to consuming high volumes of water. This problem is aggravated in the semi-arid region of the state of PE, which has a great scarcity of water resources. In the Local Productive Arrangement (LPA) effluents with high rates of organic matter are generated, responsible for the high odor content in the atmospheric air, mainly due to anaerobic decomposition generating nitrogen and sulfur compounds. These odorant gases are composed of a mixture where one of the main substances is hydrogen sulfide (H2S), highly toxic and corrosive. This work was carried out in two stages, in the first, the simulation of the dispersion of H2S in the laundry was carried out using the AERMOD software, which generated the spatial range of the odor and its impacts on the affected regions from the generating source. Although in Brazil, there is no applicable legislation for odorous substances, the results of the study are only indicative and have no legal effect. The model results revealed that the averages found for annual concentrations in 2019 and 2020 were 10 OU/m3, above the 1 OU/m3 limit determined in international legislation. Odor concentrations that violate the air quality threshold, simulated by the model, were recorded at a value of 0.12 OU/m3 throughout 2019 and 2020 in relation to the short time period of 24 hours. Therefore, studies of monitoring the dispersion of odorous gases by AERMOD simulation can prevent risks of inhalation of chemicals, protect the environment and reduce future costs to public health, but need improvement in short exposure periods. In the second part, a hydrothermal method was proposed to produce a nanomaterial composed of titanium dioxide and graphene oxide (10% by weight) (TiO2-GO). Heterogeneous photocatalysis is a clean technology that under lighting is capable of degrading odor-causing substances found in water and air and in effluent. The nanomaterial was used as a photocatalyst in the treatment of effluent, where the removal of color and COD and the decrease of the characteristic peaks presented in the UV-Vis spectrum were investigated. Analytical characterization techniques: XRD, FTIR and EDS were performed to evaluate the structure, functional groups and elemental composition of the nanomaterial. TiO2-GO dosage and pH were studied to find the optimal operating condition. The results revealed that the treatment showed higher color removal efficiency when the system was in the conditions of 0.5 g of nanomaterial, pH 3, UV-A radiation and an efficiency of 84.53 % in color removal. The kinetic test shows a COD removal of 87% after 90 minutes. The reuse test shows a decrease in COD removal after four cycles attributed to the deposition of some oxidized compounds on the catalyst surface. Finally, the efficiency of the photocatalyst was evaluated under solar radiation and it was shown that, despite the good results, the performance of TiO2-GO was better under UV-A radiation.

BANKING MEMBERS:
Interno - 2140782 - ALEX SOUZA MORAES
Externo ao Programa - 2144771 - MARCOS GOMES GHISLANDI
Presidente - 488.296.924-68 - MARILDA NASCIMENTO CARVALHO - UNICAP