title: Effect of the addition of fatty by-products from the refining of vegetable oil on methane production in co-digestion.
abstract: 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 waste. Three by-products were used: one soapstock, one used winterization earth and one skimming of aeroflotation of the effluents. Three 15 l reactors were run in parallel and fed five 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 waste) at an organic loading rate (OLR) of 1.5 g VS/kg d (VS: volatile solids). Then, a different by-product from the refining of oil was added to the feed of each reactor at an OLR of 0.5 g VS/kg d, generating a 33% increase in the OLR. The results show that the addition of by-products from the refining of oil is an efficient way of increasing the methane production of co-digestion reactors thanks to high methane yield of such by-products (0.69-0.77 l CH(4)/g VS loaded). In fact, in this work, it was possible to raise the methane production of the reactors by about 60% through a 33% increase in the OLR thanks to the addition of the by-products from the refining of vegetable oil.
authors.affiliation: Laboratoire de Biotechnologie de l'Environnement, Narbonne, France. torrijos@supagro.inra.fr
authors.forename: M
authors.initials: M
authors.lastname: Torrijos
authors.forename: P
authors.initials: P
authors.lastname: Sousbie
authors.forename: L
authors.initials: L
authors.lastname: Badey
authors.forename: F
authors.initials: F
authors.lastname: Bosque
authors.forename: J P
authors.initials: JP
authors.lastname: Steyer
mesh_terms: D019149:Bioreactors; D019649:Food Industry; D007220:Industrial Waste; D008055:Lipids / Q000737:chemistry*; D008697:Methane / Q000096:biosynthesis* / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical
chemical_list: D007220:Industrial Waste; D008055:Lipids; D010938:Plant Oils; D014874:Water Pollutants, Chemical; D008697:Methane