INTERACTION EFFECT OF CO-DIGESTION SEWAGE SLUDGE AND FOOD WASTE FOR PRODUCTION OF BIOGAS
Solid wastes increase as the population increase, so do the urbanization and industrial industries. Food waste (FW) and sewage sludge (SS) are some of solid wastes. Co-digesting of both substrates may improve process stabilization to increase biogas production and overcome the nutrients imbalance. Thus, anaerobic co-digestion has been recognized as a technology that could provide a clean renewable energy source and help reduce the landfill problem. In this study, the interaction between FW & SS as co-substrates in anaerobic digestion was studied. The experiments were conducted using modified Schott bottle as a reactor with a working volume of 500 mL. There were five different ratios of substrates in percent: 0:100, 25:75, 50:50, 75:25, and 100:0 (FW: SS). The reactor was maintained at a constant temperature of 36Â°C (Â±0.5). The substrates were filled in the reactor and left for fermentation for 14 days. There are four different parameters used to identify the characteristics of FW and SS, which are pH, Dinitrosalicylic Acid (DNS), Total Solid (TS), and Total Carbohydrate (TC). Furthermore, to record the biogas yield by a different combination of substrates, a water displacement method was used. The experimental results showed that the highest biogas yield was from the composition of 50:50 (FW: SS) with biogas volume of 1150.14 mL, while the least was the composition of 0:100 (FW: SS) with 170.47 mL biogas produced. The results for substrate degradation showed that the composition of 100:0 (FW: SS) has the highest percentage degradation for reducing sugar with percentage of 56%, while the minimum was of 0:100 (FW: SS) with percentage of 35%. Besides, for TC, the highest percentage degradation was the composition 50:50 (FW: SS) with 84%, and the least was 0:100 (FW: SS) with 44%. Finally, this study proves the using food waste and sewage sludge enhances the biogas production as well as reduced the current issues of waste disposal.
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