Effect on methane production of the addition of fatty by-products from the refining of vegetable oil in co-digestion
Torrijos , Michel (INRA , Narbonne (France). UR 0050 Laboratoire de Biotechnologie de l'Environnement) | Sousbie , Philippe (INRA , Narbonne (France). UR 0050 Laboratoire de Biotechnologie de l'Environnement) | Badey , L. (Centre Technique Industriel des Entreprises du Secteur des Corps Gras, Pessac(France).) | Steyer , Jean-Philippe (INRA , Narbonne (France). UR 0050 Laboratoire de Biotechnologie de l'Environnement)
The purpose of this work was to investigate the effects of the addition of by-products from the refining of vegetable oil on the behavior of co-digestion reactors treating a mixture of grass, cow dung and fruit and vegetable wastes. Three by-products were used: one soapstocks, one used winterisation earth and one skimming of aeroflotation of the effluents. Three 15-L reactors were run in parallel and fed 5 times a week. In a first phase of 4 weeks, the three reactors were fed with the co-digestion substrates alone (grass, cow dung and fruit and vegetable wastes) at an OLR of 1.5 g VS/kg.d. Then, one of the three by-products from the refining of oil was added to the feed of each reactor generating a 33% increase in the OLR (2 gVS/kg.d). The results show that the addition of by-products from the refining of oil is an efficient way to increase the methane production of co-digestion reactors thanks to their high methane yield (0.77 – 0.80 l CH4/gVS). Indeed, in this work, it was possible to increase by 60 to 65 % the methane production of the reactors by a 33% increase in the OLR thanks to the addition of the by-products.
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