Biogas production: litter from broilers receiving direct-fed microbials and an enzyme blend

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Maria Fernanda Ferreira Menegucci Praes ; Jorge de Lucas Junior ; Ana Carolina Amorim Orrico ; Marco Antonio Previdelli Orrico Junior ; Rafael Gustavo Hermes ; José Otávio Berti Sorbara ; Karina Ferreira Duarte ; Alice Watte Schwingel ; Sarah Sgavioli ; Carla Heloisa de Faria Domingues ; Natália da Silva Sunada

• Tipo de documento: Artigo Científico
• Fonte: Scientia Agricola; v. 73, n. 5, p. 406-411, Out. 2016.
• Citações Web of Science: 0

Resumo

ABSTRACT The effect of additives used in the feed of broilers on anaerobic bio-digestion of poultry litter was evaluated. Four diets were used: NC: negative control; DFM: NC + 500 ppm direct-fed microbials (DFM) containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm xylanase); DFM+E: ENZ + DFM. Substrates for the anaerobic bio-digestion were prepared with litter from each treatment, containing 4 % total solids (TS). These were used in 16 continuous bio-digesters with a 2 kg d−1 load, to determine the production and potential biogas production and composition during an 85-day period. Influent and effluent samples were collected for the amounts of TS and volatile solids (VS), fiber fraction (neutral detergent fiber [NDF], acid detergent fiber [ADF] and lignin), nutrients (N, P and K), and total and thermotolerant coliforms to be determined. For all treatments a reduction in the following effluents was observed as follows: TS (49, 48, 48 and 50 %) VS (70, 54, 55 and 62 %) NDF (91, 90, 95 and 96 %) ADF (89, 88, 93 and 94 %) and lignin (80, 76, 89 and 88 %). The efficiency of the treatment for coliforms in bio-digesters was higher than 90 % in the 85-day period in all treatment groups. There was a reduction in biogas and methane production when DFM (5500 and 4000 mL) and DFM + E (5800 and 4100 mL) were used, compared to treatments NC (6300 mL and 4400) and ENZ (6400 and 4500 mL). The potential production of reduced TS and VS was higher in ENZ (1:00 and 1.74 106 mL kg−1) when compared to NC (0.88 and 1:02 106 mL kg−1), DFM (0.80 and 1:40 106 mL kg−1) and DFM + E (0.88 1:25 and 106 mL kg−1). The additives did not affect the percentage of methane production, and all treatments showed values higher than 70 %. Adding enzymes to the diet of broilers influences the litter characteristics and, as a consequence, increases biogas production. The addition of DFM and DFM + E to broiler diets reduced biogas and methane production. (AU)

• Processo FAPESP: 10/11329-5 - Efeito do Bacillus subtillis e enzimas exógenas sobre o desempenho de frangos de corte e sua ação sobre as excretas na produção de biogás, utilizando-se do conceito de energia limpa
• Beneficiário: Jorge de Lucas Junior
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/05263-1 - Probiótico e enzimas em dietas de frangos de corte: desempenho, características da cama e excretas e produção de biogás
• Beneficiário: Maria Fernanda Ferreira Menegucci Praes
• Linha de fomento: Bolsas no Brasil - Doutorado