Anaerobic co-digestion of pig manure and crude glycerol at mesophilic conditions: Biogas and digestate

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• 作者：S. Astals^a ; ^{sastals@ub.edu} ; V. Nolla-Ardè ; vol^a ; ^b ; J. Mata-Alvarez^a
• 关键词：Anaerobic digestion ; Codigestion ; Swine manure ; Glycerine
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：April, 2012
• 卷：110
• 期：Complete
• 页码：63-70
• 文件大小：322 K

摘要

Crude glycerol derived from biodiesel production is characterized by its high concentration of organic carbon and its solubility in water; properties that make it a suitable co-substrate to improve the efficiency of a manure digester. An increase of about 400%in biogas production was obtained under mesophilic conditions when pig manure was co-digested with 4%of glycerol, on a wet-basis, compared to mono-digestion. The increase in biogas production was mainly a consequence of the increase in organic loading rate. However, the differences could also be related to the synergy between both substrates and the carbon-to-nitrogen ratio. Moreover, the analysis of the macro-compounds, protein, lipids, carbohydrates and fibers, showed lower removal efficiencies in the co-digester as the microorganisms obtained nutrients from the soluble carbohydrates provided by the glycerol. The digestate stability, evaluated through a respirometric assay, showed that co-substrate addition does not exert a negative impact on digestate quality.