Codigestion of swine wastewater and sugarcane stillage under different temperature conditions

Abstract

The current research aimed to perform the process of anaerobic co-digestion of vinasse, originated from the production of hydrous ethanol, and from the residues of swine raising processes using tubular biodigesters under different temperature conditions, evaluating the removal efficiency of solids, COD removal and biogas production. For this, it was used two reactors, one of which was thermally controlled while the other remained at room temperature. Three hydraulic retention times were determined with 13 days each, performing daily analysis on the reactor effluent. The TVS removal efficiencies were 29.9% for the thermally controlled reactor and 25.4% for the room temperature reactor, for the COD removal efficiency, it was verified mean values of 69.0% in the Reactor 1 and 68.4% in the Reactor 2. The temperature control caused accumulated methane production to the Reactor 1,330% higher than the reactor kept in environmental conditions.