Fadzil, Farizah (2023) Study of semi continuous stirred batch pilot-scale mono-digestion of food waste. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Food waste can be digested anaerobically in a batch- or pilot-scale reactor. Food waste digested anaerobically in a batch-scale performed differently than in a pilot-scale reactor. However, the performance of a batch pilot-scale anaerobic digestion of food waste was less documented. Thus, this research aims to evaluate the performance of a batch pilot-scale anaerobic digester fed with food waste (slurry) and to assess the kinetics of methane production. A batch pilot-scale anaerobic digester with 84 L of working volume at an inoculum to substrate (I/S) ratio of 2.0 with semi-continuously mixed at 70 rpm for 30 minutes was operated for 26 days at ambient temperature. The kinetic analysis for the methane production was assessed using Modified Gompertz and Logistic Function models. The digester performed well throughout the study period, and no instability was observed, indicated by the volatile fatty acid to total alkalinity (VFA/TA) ratio of 0.35. The methane accumulation and ultimate methane yield were 463.25 L and 5103.6 mL CH4/gVS, respectively. The difference in ultimate methane yield between the laboratory and modellings was less than 10%, indicating that both models were acceptable. The Modified Gompertz model obtains a coefficient of determination (r2) of 0.90, which is higher than the r2 obtained in the Logistic Function model, indicating that the Modified Gompertz model is more suitable for evaluating the methane production from the batch pilot-scale anaerobic digestion of food waste (slurry). In conclusion, the batch pilot-scale anaerobic digestion working at ambient temperature for food waste (slurry) works efficiently in producing methane which no lag phase period were observed. The methane accumulation and methane yield obtained from this study were higher compared to the other studies. The future study is to utilize the pilot plant for the multiple substrate to inoculum ratios

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