In vitro degradation and gas production of glycerin generated in the biodiesel production chain

Livia  Soares Silva; Leilson  Rocha Bezerra; Aderbal Marcos  de Azevedo Silva; Heloisa  Carneiro; Milena  Nunes Moreira; Ronaldo  Lopes Oliveira

In vitro degradation and gas production of glycerin generated in the biodiesel production chain

Autores

Livia Soares Silva

Leilson Rocha Bezerra

Aderbal Marcos de Azevedo Silva

Heloisa Carneiro

Milena Nunes Moreira

Ronaldo Lopes Oliveira

Editor

Universidade Estadual de Maringá

Descripción

This study was realized to evaluate the prod uction of gas and volatile fatty acids when glycerin was used to replace four forage spec ies through the use of a semi-automated technique in vitro . The experimental design included 4 treatments and 4 replications. The treatments consisted of increasing levels of glycerin (0, 30, 50 and 70%), which was used to replace the forage plants Elephant grass, sugar cane silage, corn silage and Brachiaria grass. Repl acement of the Brachiaria and Elephant grasses with glycerin linearly reduced the production of methane and carbon dioxide and ammonia nitrogen and had a positive effect on forage quality (p < 0.05). With the addition of glycerin, the values for acetate concentration decreased (p < 0.05); however, when added glycerin ther e was increased in propionic and butyric acid concentration (p < 0.05). Substitution of forage species for glycerin by tests for semi-automatic technique in vitro reduce the production of greenhouse gases (CH 4 and CO 2 ) which reduction in energy loss, and increase volatile fatty acids propionic and butyric.