DEVELOPMENT OF A BENCH-SCALE TWO-STAGE PROCESS FOR BIOGAS PRODUCTION FROM SWINE WASTE EFFLUENT

A two-stage bioreactor system consisting of two 30-L plastic drum digesters connected in series was setup and batch-fed with organic load of: 17% organic swine manure, 30% fresh inoculum, and 53% water. Three of the parameters namely: TS, TSS, BOD exhibited significant % reduction. Data clustering was also observed. The bioprocess efficiency for the two-stage reactors was computed to be 73.89%. The average gas volumetric production rates were 15.875 L/ L Reactor1 or 30.45 L/ L Reactor2. Based on the cumulative gas production, the theoretical Biochemical Methane Potential (BMP) on the average was 880.2289 x 103 ml CH4/g COD, which represented only about half of the methane value.