Banca de DEFESA: JULIANA GOMES BARRETO SOUZA LEITE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JULIANA GOMES BARRETO SOUZA LEITE
DATE: 19/04/2023
TIME: 08:00
LOCAL: Universidade Federal da Bahia - Instituto Multidisciplinar em Saúde
TITLE:

BIODIGESTION OF AGROINDUSTRIAL WASTE FOR BIOGAS PRODUCTION

KEY WORDS:

Biomass; Bioprocesses; coffee husk; Renewable energy; Manure; Manipueira; Methane.

PAGES: 80
BIG AREA: Ciências Biológicas
AREA: Microbiologia
SUBÁREA: Microbiologia Aplicada
SUMMARY:

The search on renewable energy sources has grown sharply in recent years, encouraged by international treaties and public policies that seek to mitigate the harmful environmental effects caused by high consumption and dependence on fossil fuels. Agroindustrial residues are widely available, renewable and suitable for bioconversion into value-added products. They are potential sources of fermentable sugars, but their lignocellulosic composition confers resistance to microbial hydrolysis. Co-digestion and pre-treatment techniques (physical, chemical and biological) are studied to improve the biodegradability of these residues, as well as operational parameters to optimize the production of biogas and its methane content. In this study, a systematic review was carried out on the production of biogas and methane from lignocellulosic residues and cattle manure. For this, a refined analysis of the literature was established, including inclusion and exclusion criteria for the formation of a database. In addition, the objective of this work was to apply statistical tools for process optimization to investigate the influence of operational parameters (pH, temperature and volume of substrates) for the production of biogas and CH4, from the anaerobic co-digestion of cattle manure, manipueira and coffee husk. The Central Composite Design (CDC) was used and evaluated the levels of initial pH (8, 9, 10), temperature (30, 40 and 50°C) and proportion of substrate (coffee husk: manipueira: bovine manure) on the production of biogas and methane, over 15 days of hydraulic retention. The systematic review generated a database with a total of 127 publications from different countries, from 2012 to 2022. Asian countries, such as China and India, and European countries, especially Germany, stand out as promoters of research related to optimization the production of biogas from lignocellulosic waste and cattle manure. The operational parameters, most frequently addressed in the selected studies, included the mesophilic temperature and the initial adjustment of the pH to 7. Among the pre-treatments studied, physical preparation techniques were the most used and commonly associated with chemical and biological treatments, in order to to increase the degradability and reduce the recalcitrance of cellulose and lignin. As for the results of the experimental tests carried out in the present work, it was verified that they presented significant production of biogas and methane. The statistical tool made it possible to identify an inversely proportional relationship between pH and temperature, under the conditions used. The operating conditions of initial pH 8 and 30°C temperature showed the best fermentation conditions, resulting in 798.72 cm3 of biogas and 638.98 cm3 of CH4 accumulated at the end of 15 days of hydraulic retention.

COMMITTEE MEMBERS:
Interno - 2861311 - BRUNO LOPES BASTOS
Interna - 2032145 - PATRICIA LOPES LEAL
Externa à Instituição - FABIA GIOVANA DO VAL DE ASSIS