KINETIC MODELLING FOR BIO-METHANE GENERATION DURING ANAEROBIC DIGESTION OF MUNICIPAL SEWAGE SLUDGE..

This research focuses on the use of Acti-zyme as a bio-catalyst in kinetic modelling to simulate bio-methane synthesis from sewage sludge digestion. Acti-zyme loadings of 50 g/m3, sewage sludge loadings of 5-7.5 g/L.day, and retention times of up to 40 days were used to digest sewage sludge at 37°C and 55°C. At 37°C and 78 percent composition, optimal bio-methanation was attained. The linear, exponential, logistical kinetic, exponential increase to a maximum, and modified Gompertz kinetic models were fitted to the bio-methane production experimental data, and the coefficients of determination (R2) were found. During the bio-methanation process, a ten-day lag was found. With an R2 value of 0.999 and a rate constant of 0.073 day-1, the exponential increase to a maximum kinetic model accurately replicated bio-methane production. As a result, the logistics kinetic model may be used to accurately describe experimental data for bio-methane generation.

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