Optimization of Parameters for Biogas Production from Bagasse Using Taguchi Method

Abstract

Biogas production from lignocellulosic compounds is affected by several parameters. In the present article, Taguchi method was applied in evaluating the parameters including inoculums type (cow rumen and cow dung), pretreatment time (0, 24, 48 h), and total solid content (2, 5, 10 %). The L 18 (2 1 ×3 2 ) full factorial design with a mixed orthogonal array was selected to conduct the experiments. Furthermore, to find the percentage contribution of each parameter on biogas yield, the analysis of variance was applied. The analysis results showed that the best inoculum type was cow rumen (signal-to-noise 27.59), the best pretreatment time was 48 h (signal-to-noise 28.20) and the best total solid was 2% (signal-to-noise 31.98). Furthermore, the percentage contribution of inoculum type, pretreatment time, and total solid was 0.43, 7.97 and 83.51% respectively. It means the total solid was the most effective parameter and then it was followed by pretreatment and inoculums. The predicted maximum biogas yield of 42.59 L/kg resulted from an optimum condition of inoculum of cow rumen, pretreatment time of 48 h, and a total solid of 2%. In the confirmation test, the Taguchi method could predict biogas yield successfully with R 2 of 0.919.

Effect of Cow Manure on Biogas Production Based on Rice Husk Waste in SSAD Conditions

“…The reactor is equipped with a rubber valve that can be opened and closed for the biogas production measurement process. The measurement of biogas is carried out every 2 days with the help of a laboratory measuring cup with units of milliliters [5], [13]. The description of the reactor and the process of measuring biogas production can be seen in Figure 1 below.…”

“…Next on this variable is cow dung with half the content of rice husks. Cow dung used as raw material for biogas is very easily converted by anaerobic bacteria and has a fairly high gas production characteristic in the early stages of anaerobic processing [10], [13], [35]. The combination of the two between rice husks and cow dung gives positive results on biogas productivity.…”