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

作者：Astals S^*; Nolla Ardevol V; Mata Alvarez J

来源：Bioresource Technology, 2012, 110: 63-70.

DOI：10.1016/j.biortech.2012.01.080

• Anaerobic digestion
• Codigestion
• Swine manure
• Glycerine

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.

• 出版日期2012-4