Banca de QUALIFICAÇÃO: TIAGO KESAJIRO MORAES YAKUWA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : TIAGO KESAJIRO MORAES YAKUWA
DATE: 21/12/2020
TIME: 09:00
LOCAL: google meet
TITLE:

Biochar, biomass and orange pomace compound: characterization and fractionation of P from bioproducts, and agricultural potential

KEY WORDS:

Solid waste, nutrients, Citrus sinensis, sustainability, phosphorus availability

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Brazil is one of the main countries that export orange juice. The processing of the orange to obtain the juice generates a large amount of solid waste. These residues can cause environmental, social and economic problems, their easy fermentation and decomposition, exhale odor and contribute to the proliferation of pathogens. The use of agribusiness residues as a bioproduct, rich in nutrients, mainly, P can bring a significant contribution to the environment and the sustainability of production. The characterization of biocarbons, biomass, orange pomace compound, and phosphorus fractionation of these products was carried out, as well as the potential as a bioproduct, using lettuce as an indicator culture. Was produced biochar (BBL)  at 300; 500 and 700 ºC, biomass (BMBL) and orange bagasse compound (CBL), and analyzed: yield, pH, electrical conductivity (CE), cation exchange capacity (CTC), zero charge point (PCZ), volatile levels (TV), ash content (TC), fixed carbon (CF), total content, scanning electron microscope (SEM) scanning and P fractionation. BBL yield was higher at the pyrolysis temperature of 300 ºC and lower at 700 ºC. BBL showed alkaline pH values at all pyrolysis temperatures (9.5 to 11.5). Pyrolysis promoted an increase in CE in BBL at 500 and 700 ° C. BBL 500 ° C and CBL showed higher CTC values. The PCZ in BBL was higher when produced at a temperature of 500 ° C, pH 9.0, different from BMBL and CBL, which had values of pH 3.0 and 5.3, respectively. The TV decreased from BBL as the temperature increased from 300 to 700 ºC. The highest percentage of TC was obtained in BBL produced at a temperature of 700 ºC (48.1%), followed by CBL (32.7%). The CF in BBL was higher when produced at the pyrolysis temperature of 500 ° C and at 700 ° C there was a decrease of 14.44%. In the BBL, the porosity increased with the temperature of the pyrolysis, the BMBL had a surface with no pores and an irregular contact surface, while in the CBL it had greater roughness and less pores. The total content of macronutrients in all orange bagasse products was in the following order: K> Ca> P> Mg, with K in BBL, produced at 700 ºC, the highest, for micronutrients the order was: Fe> B> Mn> Zn> Cu> Mo, with higher Fe value in CBL. The fractionation of orange bagasse in all forms of use showed high levels of P, varying the forms in each treatment. The pyrolysis of the orange bagasse at 500 ° C produced promising physical-chemical characteristics, showing the potential to be used to improve soil quality. In the fractionation of P among the products, CBL can be used as the most readily available source of P, different from BBL 300 and 500 ° C, which presented different fractions and possibly a slower release of P into the soil. The production of biochar and orange bagasse compound can be considered an environmentally sound technology in the reuse of citrus waste. BMBL improperly disposed of can cause pollution because it contains high levels of P-soluble.

BANKING MEMBERS:
Interno - 6388356 - ANTONIO RODRIGUES FERNANDES
Interno - 030.493.086-56 - SILVIO JUNIO RAMOS - ITV
Externa à Instituição - EDNA SANTOS DE SOUZA - UNIFESSPA
Externo à Instituição - RAFAEL SILVA GUEDES - ITV