Banca de QUALIFICAÇÃO: ALLAN BRUNO DANTAS GONÇALVES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ALLAN BRUNO DANTAS GONÇALVES
DATA : 27/11/2019
HORA: 14:00
LOCAL: CAMPUS JUAZEIRO DO NORTE/UFCA
TÍTULO:

THEORETICAL-EXPERIMENTAL STUDY OF BIOGAS PRODUCTION IN
UASB REACTORS TREATING INDUSTRIAL WASTE WATER

PALAVRAS-CHAVES:

UASB, Biogas, Computational Fluid Dynamics, CFX, Multiphase System.

PÁGINAS: 60
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Monitoring biogas production in upstream anaerobic sludge blanket reactors (UASB) for many years was not considered relevant at the design, construction and operation stages. However, the search for alternative energy sources and the need to meet sustainability requirements has sparked interest in this gas. This research aims to investigate, through a theoretical and experimental study, the production of biogas in UASB reactors, with different phase separation element configurations, treating industrial wastewater and subjected to different biological loads. To achieve this goal, the methodology adopted in this research was divided into two stages, the first experimental and the second theoretical via numerical simulation. For the experimental stage, two UASB reactors were constructed with different phase separation element configurations: one of the conventional type (R1) and the other in Y format (R2). These reactors were monitored to determine stability and operational performance by analyzing temperature, pH, alkalinity due to bicarbonates and volatile fatty acids, organic matter, solids; in addition to the flow measurements and biogas compositions generated in the reactors. In the numerical step the following steps were performed: discretization of the reactor physical domains by CFD techniques, development of mathematical modeling and numerical solution capable of describing the flow dynamics in UASB reactors and use of ANSYS CFX 15.0 software to solve the equations. differentials that govern the phenomena involved, considering three-phase flows. The numerical results will be validated from the experimental results. From the results of the experimental phase it appears that both reactors presented satisfactory operational stability, since the pH values remained in the neutral range. This result was corroborated by the good efficiency of organic matter removal, as average percentages of 74 and 73% were obtained in R1 and R2, respectively, and the high production of high methane biogas. On average, biogas flow rates at R1 of 0.054 and 0.066 m3 / d (both with methane content of 79.2%) were obtained for the biological load ranges from 0.1 to 0.3 kgDQO / kgSTV.de from 0.31 to 0.5 kgDQO / kgSTV.d, respectively. In R2, biogas flow rates of 0.056 m3 / d (with methane content of 78.8%) were obtained for biological loads ranging from 0.1 to 0.3 kgDQO / kgSTV.d, and 0.067 m3 / d ( methane content 79.7%) for biological loading ranges from 0.31 to 0.5 kgDQO / kgSTV.d. Regarding the numerical step, after the study of dependence and refinement of the generated meshes were selected to
 
represent R1, a mesh consisting of 57008 hexahedral elements. To represent R2, the mesh with 257208 hexahedral elements was selected. The boundary conditions representative of reactor behaviors have also been established. The next phase of the numerical phase consists of hydrodynamic behavior simulations inside the UASB reactors. Comparative analysis of the results of these simulations with the experimental results is expected to yield satisf

MEMBROS DA BANCA:
Externo à Instituição - Antonio Gilson Barbosa de Lima - UFCG
Externo à Instituição - FLÁVIO CÉSAR BRITO NUNES - IFCE
Presidente - 1337574 - MARIA GORETHE DE SOUSA LIMA BRITO
Interno - 1751179 - PAULO RENATO ALVES FIRMINO