PRODUCTION OF BIOGAS BY ANAEROBIC CODIGESTION OF POLYHYDROXYBUTIRATE (PHB) AND RESIDUAL SWINE WATER IN MESOPHYLIC PHASE

The work evaluated the production of biogas by anaerobic digestion of concentrations of polyhydroxybutyrate with swine wastewater (SWW). Twelve batch reactors with a useful volume of 3.2 L, stored in an oven under mesophilic conditions (35 °C) with a hydraulic retention time of 33 days, were used. The substrate consisted of inoculum, SWW and PHB, arranged in four treatments (control, 4.5 g PHB (PHB1); 22.6 g PHB (PHB2) and 45.2 g PHB (PHB3). better removal of total volatile solids, with 99.49%. The same treatment had the highest accumulated biogas production, with 41.3 L. The PHB1 treatment had the highest conversion rate of PHB into biogas, totaling 203.91 mL of biogas /gTVS and showed the highest composition of methane in biogas, reaching 72.6% on day 14. The addition of PHB in anaerobic digestion is seen as an alternative to increase biogas production.