Banca de DEFESA: THAYANE DUARTE COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : THAYANE DUARTE COSTA
DATE: 31/01/2022
TIME: 08:30
LOCAL: remota
TITLE:

Variations in the bioenergetic quality of açaí waste stored under different conditions over time

KEY WORDS:

Higher heating value. Euterpe oleraceae. Bioenergy. Fixed carbon. 

PAGES: 44
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

The production and commercialization of the açaí fruit has contributed significantly to the agro-industrial development of the Amazon region. However, such progress has been accompanied by the exponential growth of post-processing waste generation, with potential for the generation of bioenergy. However, inadequate storage, which depreciates the biomass, is one of the main limitations for this purpose. Therefore, the objective of this work was to analyze the effect of the environment and storage time on the degree of modification of the quality of the açaí waste for pyrolysis and combustion. The seeds were stored under three different conditions: immersed in deionized water, under the ground and in plastic bags, stored in a covered greenhouse for nine months. Physical and chemical analyses of the fresh residue were performed at time 0 (zero) and after 30, 60, 180, and 270 days of storage. Analyzes of water-soluble extractives, Fourier transform infrared spectroscopy, thermogravimetric in inert atmosphere and thermogravimetric in oxidative atmosphere were performed for the fresh waste and at the end of the storage time. Storage in soil and plastic bag caused a significant decrease in the waste moisture, unlike storage in water. The density of the residue stored in water and in a plastic bag reduced after 30 days. For waste stored in soil, this property decreased up to 180 days, increasing again after 270 days of storage. Fixed carbon and ash content increased while volatile material content decreased proportionally for the three conditions in relation to the fresh residue. Soil and water storage decreased water-soluble materials. Soil storage increased the concentration of lignin and silica. All storage methods made the residue more stable for pyrolysis and combustion. The storage in water was the one that most depreciated the energetic properties of the açaí residue. Soil and plastic bag storage are beneficial for increasing fixed carbon content and decreasing moisture content, but adversely affect ash content and waste density.

BANKING MEMBERS:
Externo à Instituição - ALAAN UBAIARA BRITO
Interno - 741.673.590-49 - GUSTAVO SCHWARTZ - EMBRAPA
Presidente - 2410727 - LINA BUFALINO
Externa à Instituição - VANIA APARECIDA DE SÁ - UFAL