EVALUATION OF THE ENERGY POTENTIAL OF RESIDUAL BIOMASS FROM BROWN PORTER STYLE BEER PRODUCTION | ENERGY POTENTIAL OF SPENT GRAINS FROM BROWN PORTER STYLE BEER PRODUCTION

English. The purpose of this study was evaluate the energy potential of the residual biomass of Brown Porter type beer malt. Analyses of calorific value, moisture, lignin content, ash content, volatile materials and fixed carbon were carried out in order to investigate the energy potential of this biomass. For a better understanding of the thermal degradation behavior of this biomass, a thermogravimetric analysis was performed and the TGA curves evidenced the degradation of lignocellulosic matter as hemicellulose and cellulose (120 °C and 350 °C) and lignin (350 °C and 600 °C). The malt bagasse analyzed showed good potential for direct energy generation, 3956.96 kcal kg-1 of useful calorific value, when the moisture of the material is disregarded. This result is supported by the values found for the lignin content, 31.79 % d.m., and having the carbon content 44.85%, which are determining factors for energy generation in a biomass. Another positive point is that the the ash contente of the malt bagasse produce less ash, 3.86 %, than other biomasses like rice husks and and sugarcane bagasse which facilitates its application in the combustion process.

Portuguese. ENERGY POTENTIAL OF SPENT GRAINS FROM BROWN PORTER STYLE BEER PRODUCTION   CARLOS GUILHERME LOPES GROTTO1, CARLA JOVANIA GOMES COLARES1, AILTON TEIXEIRA DO VALE2, DOUGLAS HENRIQUE PEREIRA1   1 Colegiado de Ciencias exatas e Biotecnológicas, Universidade Federal do Tocantins, campus de Gurupi, rua Badejós,77402-970, Gurupi -TO, Brasil. [email protected], [email protected], [email protected]. 2 Departamento de Floresta, Universidade de Brasília, Campus Darcy Ribeiro, 70910-900, Brasília-DF, Brasil. [email protected].   ABSTRACT: This study aimed to evaluate the energy potential of residual biomass (brewer spent grains - BSG) of Brown Porter type beer malt. Analyses of calorific value, moisture, lignin content, ash content, volatile materials and fixed carbon were carried out to investigate the energy potential of BSG. For a better understanding of the thermal degradation behavior of BSG, a thermogravimetric analysis was performed and the TGA curves evidenced the degradation of lignocellulosic matter as hemicellulose and cellulose (120°C and 350°C) and lignin (350°C and 600°C). The observed moisture content measured was 12.69%. The BSG analyzed showed good potential for direct energy generation, 16.57 MJ kg-1, of useful calorific value when the moisture of the material is disregarded. This result is supported by the values measured for the lignin content (31.79% in dry mass) and with carbon, hydrogen, nitrogen and oxygen contents values of 44.85%, 7.06%, 3.53% and 40.70%, respectively. Another positive point is that the ash content of BSG produces less ash, 3.86%, than other biomasses as rice husks and sugarcane bagasse, which facilitates its application in the combustion process. The characterization of the grains used for the production of different types of beer is important for the best use of the residues for power generation, providing alternatives for the beer market.   Keywords: waste, brown porter malt bagasse, energy source.   POTENCIAL ENERGÉTICO DE GRÃOS GASTOS DA PRODUÇÃO DE CERVEJA DO ESTILO BROWN PORTER   RESUMO: O trabalho teve como objetivo avaliar o potencial energético da biomassa residual (grãos gastos da cervejaria - BSG) do malte da cerveja tipo Brown Porter. Análises de poder calorífico, umidade, teor de lignina, teor de cinzas, materiais voláteis e carbono fixo foram realizadas a fim de investigar o potencial energético da biomassa BSG. Para um melhor entendimento do comportamento de degradação térmica, foi realizada uma análise termogravimétrica e as curvas TGA evidenciaram a degradação da matéria lignocelulósica como hemicelulose e celulose (120°C e 350°C) e lignina (350°C e 600°C). O teor de umidade observado medido foi de 12,69%. A BSG analisada apresentou bom potencial de geração de energia direta, 16,57 MJ kg-1, de poder calorífico útil quando desconsiderada a umidade do material. Este resultado é apoiado pelos valores medidos para o conteúdo de lignina (31,79% em massa seca) e pelos valores de carbono, hidrogênio, nitrogênio e oxigênio de 44,85%, 7,06%, 3,53% e 40,70%, respectivamente. Outro ponto positivo é que o teor de cinzas da BSG produz menos cinzas, 3,86%, do que outras biomassas como casca de arroz e bagaço de cana-de-açúcar o que facilita sua aplicação no processo de combustão. A caracterização dos grãos utilizados na produção dos diferentes tipos de cerveja é importante para o melhor aproveitamento dos resíduos para geração de energia, proporcionando alternativas para o mercado cervejeiro.   Palavras-chaves: resíduos, bagaço de malte brown porter, fonte de energia.