| الوصف: |
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. The hydraulic retention time (HRT) for digester 1 was 6- 8 days; digester 2 was 13-16 days. Using principal component analysis (PCA), we showed that the top 5 bioprocess parameters were total solids (TS), total suspended solids (TSS), chemical oxygen demand (COD), biochemical oxygen demand (BOD), and volume of gas. Significant positive correlations were observed with TS, TSS, COD, and BOD; volume of gas was negatively correlated and increased twice compared to digester 1. 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. ; Funded by the Industrial Technology Development Institute (ITDI) - DOST Philippines |