Laboratory scale examination of the effects of overloading on the anaerobic digestion by glycerol |
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Authors: | Rétfalvi Tamás Tukacs-Hájos Annamária Albert Levente Marosvölgyi Béla |
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Institution: | a Institute of Chemistry, Faculty for Forestry, University of West Hungary, H-9400 Sopron, Bajcsy-Zs. u.4., Hungary b GázInnov Ltd, H-9400 Sopron, Asszonyvásár d?l? 31., Hungary c Cooperation Research Centre Non-profit Ltd., University of West Hungary, H-9400 Sopron, Bajcsy-Zs. u. 4., Hungary |
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Abstract: | The anaerobic digestion of pure glycerol, which produces a baseline acetic acid to propionic acid ratio of 0.2, was studied in laboratory scale reactors (3 l working volume) at mesophilic temperature (37 °C) with 3000 mg chemical oxygen demand (COD) l−1d−1. During the experiment tVFA and C2-C6 VFA analysis and daily biogas yield measurement were carried out. Following 10 days of a 15% d−1 increase in the organic loading rate (OLR) of 3.0-10.5 g COD l−1d−1, the concentration of propionic acid increased to 6200-8000 mg l−1. Then the inoculum was divided into three parts feeding with 100% glycerol, 50% glycerol + 50% acetic acid, and 50% glycerol + 50% thick stillage, (presented in % of 2.60 g COD l−1d−1 OLR), respectively. The application of co-substrates reduced the recovery period by 5 days compared to feeding with pure glycerol. When the reactors were loaded with glycerol again (10% OLR raise per day) the previously applied co-substrates had a positive effect on the VFA composition and the biogas yield as well. |
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Keywords: | Anaerobic digestion Glycerol Overload Volatile fatty acid |
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