Biodigestão anaeróbia de dejetos de suínos sob efeito de três temperaturas e dois níveis de agitação do substrato: considerações sobre a partida

Abstract

RESUMO:Neste trabalho, avaliou-se a biodigestão anaeróbia de dejetos de suínos. Para isso, foi utilizado esquema laboratorial, constituído de 24 digestores com volume total de 14 L, sendo cada um abastecido com dejetos de suínos em fase de terminação, diluídos em água, perfazendo 10 L de volume útil de substrato com concentração inicial de sólidos totais de 6%. Três grupos formados por oito desses biodigestores foram expostos a três temperaturas (25; 35 e 40 o C) e a dois níveis de agitação (com e sem) do substrato. A análise da fase de partida foi feita com base na produção média acumulada de biogás, num período de 71 dias. Os resultados demonstraram que a agitação não interferiu e que o melhor desempenho, inclusive o menor tempo gasto para atingir determinado nível de produção de biogás, foi verificado na temperatura de 35 o C. PALAVRAS-CHAVE:biodigestor, suinocultura, etapa de partida. ANAEROBIC DIGESTION OF SWINE WASTES UNDER EFFECT OF THREE TEMPERATURES AND TWO SUBSTRATUM AGITATION LEVELS -CONSIDERATIONS ABOUT THE DEPARTURE PHASEABSTRACT: In this work was evaluated the anaerobic digestion of swine wastes. For that, a laboratory scheme was used, consisting of 24 digesters whose total volume was 14 L, being each one supplied with ending swine wastes, diluted in water, resulting on 10 L of net volume of substratum, with initial total solids concentration of 6%. Three groups formed by eight of these biodigesters were exposed to three temperatures (25; 35 and 40 o C) and to two substratum agitation levels (with and without). The departure phase analysis was based in the average accumulated biogas yield along the period of 71 days. Results showed that agitation didn't contribute and that the best performance, including the minor time requested to obtain a specific biogas yield level, was verified in the temperature of 35 o C.

Nutritional Evaluation and Effectiveness of Detoxified <i>Jatropha curcas</i> Kernel Meal in Finishing Pig Diets on Biogas and Methane Production from Slurry

“…The biogas (1201.4; 1089.3 mL/g of total solids) and methane (246.7 and 218.2 mL/g of total solids) production from the finishing pigs manure fed with reference diet and diet containing DJCM are compatible with those observed by Souza et al (2005), evaluated different retention hydraulic times and incubation temperatures of pigs manure. The methane proportion in relative to the biogas generated was of 20.5 and 20.35% for the treatments RD and RD8%, values well below of 60 to 70%, theorized by Miranda (2009) as normal.…”

“…These conditions were observed by Souza et al (2005) as being ideal for biogas production by pigs manure, simulating the conditions of a batch bio digester, without continuous flow of effluents, for biogas and methane (CH 4 ) quantification. Two treatments were used, RD and TD (7.7% inclusion of DJCM), through ten bottles (replicates) for each treatment.…”

Avaliação da produção de biogás de dejetos de suínos utilizando a metodologia de superfície de resposta

“…Souza et al (2005) obtiveram resultados similares em um sistema de biodigestão anaeróbia para os efeitos do TRH, da temperatura e da agitação do substrato sobre a produção volumétrica de metano a partir de dejetos de suínos em fase de terminação. Uma diferença significativa foi observada na produção de biogás e na produção volu- …”

The Deployment of Biodigester Systems in Rural Properties

“…Souza et al (2005) remark that the storage of swine wastes in anaerobic biodigesters comprises the harnessing of biogas mainly composed of methane, sulfur dioxide, ammonia, hydrogen sulfide and nitrogen. They have been employed as energy sources, frequently replacing natural gas (ASTALS et al, 2012;CAPPONI et al, 2012).…”