Co-digestion of crude glycerin associated with cattle manure in biogas production in the State of Parana, Brazil/Avaliacao da codigestao de glicerina associada a esterco bovino para producao de biogas no Estado do Parana, Brasil

• Published in: Acta scientiarum. Technology Vol. 39; no. 2; p. 149
• Main Authors: Pazuch, Felix Augusto, Siqueira, Jesse, Friedrich, Leandro, Lenz, Anderson Miguel, Nogueira, Carlos Eduardo Camargo, de Souza, Samuel Nelson Melegari
• Format: Journal Article
• Language: Spanish
• Published: Universidade Estadual de Maringa 01.04.2017
• Subjects: Brasil
• ISSN: 1806-2563; 1807-8664
• DOI: 10.4025/actascitechnol.v39i2.29167

The addition of different concentrations of crude glycerin, associated with cattle manure, on the volumetric production of biogas is analyzed. Different concentrations of crude glycerin (2, 4 and 6% m [m.sup.-1]) were added as supplement in anaerobic co-digestion of dairy cattle waste, in laboratory batch biodigesters (3.5 L usable volume). The biodigesters were operated under mesophilic conditions (30[degrees]C), with 30-day hydraulic retention time (HRT). Total solids (TS), volatile solids (VS) and chemical oxygen demand (COD) were analyzed to determine the efficiency of the process in the removal of organic matter and its effect on biogas production. The addition of 4% glycerin provided a larger production of biogas, approximately 9.307 mL. The efficiency in COD removal decreased in treatments with glycerin, with highest reduction (68%) in the control treatment. There was a 90 and 118% increase respectively for Gli4 and Gli6% treatments. VS reductions Gly 0, Gly 2, Gly 4 and Gly 6% treatments were 18.17, 61.60, 24.36 and 44.83%, for the respective treatments. Keywords: bio-digestion, cattle manure, biogas, crude glycerin, biodiesel. O objetivo do trabalho foi avaliar o efeito da adicao de diferentes concentracoes de glicerina bruta associada com esterco bovino, sobre a producao volumetrica de biogas. A adicao de diferentes concentracoes de glicerina bruta (2, 4 e 6% m [m.sup.-1]) foi utilizada como suplemento na codigestao anaerobia de dejetos bovinos de leite, em biodigestores laboratoriais de batelada (3,5 L de volume util). Os biodigestores foram operados em condicoes mesofilicas (30[degrees]C), com tempo de retencao hidraulica (TRH) de 30 dias. Foram analisados os solidos totais (ST), solidos volateis (SV) e demanda quimica de oxigenio (DQO), a fim de determinar a eficiencia do processo na remocao da materia organica e seu efeito na producao de biogas. A adicao de 4% de glicerina resultou na maior producao de biogas, cerca de 9,307 mL. A eficiencia na remocao de DQO diminuiu nos tratamentos com adicao de glicerina, sendo a maior reducao no tratamento controle, de 68%. Nos demais tratamentos houve um aumento de 90 e 118% para os tratamentos Gli 4 e Gli 6% respectivamente. As reducoes de SV para os tratamentos Gli 0, Gli 2, Gli 4 e Gli 6%, foram de 18, 17, 61, 60, 24, 36 e de 44,83%, para os respectivos tratamentos. Palavras-chave: biodigestao, dejetos bovinos, biogas, glicerina bruta, biodiesel.