Co-digestion of cow manure, food waste and intermittent input of fat

• Author(s): Neves, L. ; Oliveira, Rosário ; Alves, M. M.
• Date: 2008
• Persistent ID: http://hdl.handle.net/1822/26237
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Anaerobic digestion; Biogas; Cow manure; Food waste; Lipids; Oily effluent
• Document Type: Conference Object
• Language: English

Description

Pulses of fat were added to completely mixed reactors fed with dairy cow manure (CM) and food waste (FW). After achieving a stable performance at an organic loading rate (OLR) of 4.6± 0.1 gCOD/(Lreactor.day), an oily effluent (OE) from a canned fish processing industry was fed in the form of pulses, raising the lipids concentration up to 9, 12, 15 and 18 gCODfat/Lreactor. The highest fat concentration of 18gCODfat/Lreactor promoted a reversible inhibition in the methane production. All the other pulses had a positive effect in the methane production. From a practical point of view, this work demonstrates that controlled intermittent inputs of fat can enhance the methane production in the co-digestion of CM and FW.