Abstract

Charles Otobrise^*, Chidi Wisdom Udubor and Emmanuel Osabohien

DOI : http://dx.doi.org/10.13005/ojc/380411

Anaerobic digestion of goat dung and pawpaw seed and the fitness of some kinetic models in predicting the rate and cumulative production of biogas were investigated in this study, to compare biogas potential of plant and animal based wastes as well as evaluate the effect of co-digestion on biogas production. The results revealed that the goat dung produced higher volume of biogas (4943 mL) than the pawpaw seed (4329 mL). The mixture of both produced the highest volume (5871 mL) of biogas in comparison with the mono-substrates. Polynomial regression model gave the best correlation with R2 value ranging from 0.9650 - 0.9810 for the three experiments when compared with linear regression model for the ascending limb with R2 values ranging from 0.9210 – 0.9500. For descending limb, polynomial regression also gave a better fit with R2 value in the range of 0.9690 – 0.9770 than the linear regression (R2: 0.9560 – 0.9700).
Keywords: Biogas, kinetics; models, goat dung, pawpaw seed, co-digestion

Biogas; Co-digestion; Goat dung; Kinetics; Models; Pawpaw seed

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