Banca de QUALIFICAÇÃO: THALES SILVA FERREIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : THALES SILVA FERREIRA
DATE: 03/07/2026
TIME: 08:00
LOCAL: https://meet.google.com/jsv-pkvw-shd
TITLE:

MODELING OF BIOGAS PRODUCTION FROM WET AND DRY COFFEE HUSK

KEY WORDS:

keywords: Modeling; Biogas; Kinetics.

PAGES: 48
BIG AREA: Ciências Agrárias
AREA: Engenharia Agrícola
SUBÁREA: Energização Rural
SUMMARY:

Brazil is one of the world's leading coffee producers, and although coffee cultivation plays a major role in the national economy, it also generates significant environmental challenges. Coffee processing produces large quantities of residues with underutilized energy and economic potential. Biogas production from coffee husk remains an underexplored research topic, and mathematical modeling combined with statistical analysis may support the replacement of conventional fossil fuels by renewable bioenergy sources. Coffee husk, the main residue generated in the coffee production chain, is a lignocellulosic biomass whose energy recovery is hindered by its high structural recalcitrance.

In this context, this study aims to evaluate the technical feasibility of the anaerobic co-digestion of dry coffee husk (DCH) and wet coffee husk (WCH) from the EMCAPA 8121 variety, combined with cattle manure (CM), to optimize biogas production. The experimental design employs laboratory-scale Indian-type batch biodigesters configured with different substrate proportions (0:0:1, 1:5:0, 0:5:1, 1:5:1, 2:5:1, and 1:5:2 for DCH/WCH:Water), with three replicates per treatment.

The monitoring protocol includes comprehensive physicochemical characterization of both the feedstocks and the final digestate, together with continuous monitoring of temperature, relative humidity, and cumulative biogas production. Based on cumulative biogas yield, nonlinear kinetic models, including the Modified Gompertz, Logistic, and Boltzmann models, among others, will be fitted to estimate the specific biogas production rate, lag phase duration, and maximum biogas production potential.

The expected results are to demonstrate the operational stability of the anaerobic digestion process and the technical and economic feasibility of converting coffee production residues into a renewable energy source capable of partially replacing fossil fuels while promoting the sustainable management of agro-industrial waste.

COMMITTEE MEMBERS:
Interno - 2161784 - JOAO PAULO BARRETO CUNHA
Externo ao Programa - 1037345 - DANIEL MARIANO LEITE - UFRRJ