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EFFECT OF SOLID LOADINGS ON BIOGAS PRODUCTION FROM THE CO-DIGESTION OF CORN STALKS WITH COW DUNG

In an extension to our previous work where we investigated the anaerobic digestion of Corn stalk (CS) and Cow dung (CD) with co-digestion experiments at initial total solid loading of 37.5%. This paper has investigated the anaerobic co-digestion of CS and CD at lower solid loadings of 10%, 15 % and 20% TS. These experiments were also carried out at different substrate mixing ratios of CS-CD 1:1 and CS-CD 1:2. The anaerobic digestion was carried out in a digester designed and fabricated locally with retention time of 45 days. Results show a maximum Biogas Yield of 67.85L/Kg TS and 75.75L/Kg TS for 10%TS at CS-CD 1:1 and CS-CD 1:2 respectively. Experiments carried out at 20% TS showed the lowest Biogas Yield/Kg of 44.5L/Kg and 50.38L/Kg for CS-CD 1:1 and CS-CD 1:2 respectively. Results also showed that studies carried out at CS-CD 1:2 showed higher biogas yields for substrate concentrations of 10%, 15 % and 20% TS when compared to corresponding experiments carried out at a mixing ratio of CS-CD 1:1.