| Optimizing biogas production with synergetic effects of sewage sludge and sugarcane straw in anaerobic co-digestion with long-hydraulic retention time based on optimal-mixture design |
| Paper ID : 1157-NICAME1402 |
| Authors: |
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Ezatolah Azadi1, Majid Rasouli *1, behnam ataeiyan2 1Biosystem Engineering Department, Bu-Ali Sina University, Hamedan, Iran 2Biosystem Engineering, Tehran University, Tehran |
| Abstract: |
| A mesophilic co-digestion of sugarcane straw and sewage sludge with long hydraulic retention time (HRT) in lab-scale reactors has been studied. The both design of the experiment method and the I-optimal mixture design were used as a mixed design strategy to systematically optimization of the substrate composition ratios and elucidate the possible synergistic effects for an anaerobic co-digestion system. A reduced cubic model was created by Design-Expert software as a function of substrate composition ratios. The model was experimentally validated by ANOVA. Based on the observations, all linear impacts and interactions between substrates showed synergistic effects on the biogas production rate. The optimum proportions of the feedstock were 0.28 % (w/w) of Primary sludge (A), 48.98 % (w/w) of Secondary sludge (B), and 50.73 % (w/w) of sugarcane straw (C). According to the aforementioned optimum proportions, the amount of cumulative biogas reaches the maximum level of 8581 mL during 150 days. |
| Keywords: |
| Lignocellulosic Biomass, Response Surface Methodology (RSM), Systematically Optimizing, Waste to Energy, Wastewater Sludge |
| Status : Paper Accepted (Oral Presentation) |
