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

Bioresource Technology
S AstalsJ Mata-Alvarez

Abstract

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.

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Citations

Dec 20, 2013·Environmental Technology·Miroslav HutnanIgor Bodik
Jun 16, 2014·Bioresource Technology·Dongxue YinGuangxin Ren
Jan 25, 2014·Bioresource Technology·Ivan Rodriguez-VerdeMarta Carballa
Jul 10, 2013·Bioresource Technology·Rajinikanth RajagopalGursharan Singh
Apr 16, 2013·Journal of Environmental Management·Vahid RazaviaraniHassan Katalambula
Oct 16, 2012·Water Research·S AstalsJ Mata-Alvarez
Feb 23, 2013·Bioresource Technology·Vahid RazaviaraniHassan Katalambula
Sep 10, 2013·Bioresource Technology·Santiago García-GenJorge Rodríguez
Jun 4, 2015·Waste Management·Valentine Nkongndem NkemkaXiying Hao
Jan 27, 2015·Journal of Bioscience and Bioengineering·Hailin TianMingzhu Zhong
Jun 19, 2012·Bioresource Technology·Fuqing Xu, Yebo Li
Jan 12, 2013·Bioresource Technology·Miroslav HutňanMarianna Czölderová
Jul 13, 2016·Waste Management·M S Romero-GüizaS Astals
Jul 28, 2016·Journal of Biotechnology·Viktor KlassenJan H Mussgnug
Sep 8, 2016·Bioresource Technology·Liandong ZhuZhaohua Li
Jan 26, 2017·Water Research·Sherri M CookNancy G Love
Dec 28, 2016·Waste Management·Ángela Rodríguez-AbaldeBelén Fernández
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Apr 30, 2014·Environmental Science. Processes & Impacts·Han GaoGeorge F Wells

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