Abstract
A possible way of enhancing biogas yield from substrates is through the introduction of inoculum in a form of biomaterial with potential of increasing microbial population. Therefore, this research evaluated biopotential property of maggots as inoculum in anaerobic digestion of substrates for biogas production. The substrates used in the study are chicken droppings (CD) and swine dung (SD). The experiment was set up using biodigesters, water tanks with collectors. Cube-shaped plastic kegs of 25 L was adapted as biodigesters. The biodigesters were batch loaded and filled to 75% capacity, amounting to 18.5 L working volume with retention time of 5 weeks (35 days). During this retention time, the ambient and substrate temperatures were measured daily including the biogas yield while the pH was measured weekly. The result demonstrated that pH was within the range of 6.80-7.31, which is found to be within the standard of 6-8 pH level considered suitable for existence of anaerobic bacteria. Similarly, the mean temperature varied between 28.3-35.2ºC which is found to be within the range of 25-35 ºC reported to be suitable for the necessary anaerobic bacteria to survive. Furthermore, the total biogas yield for substrates treatment with maggots were higher compared with substrates treatment without maggots. This is an indication that the maggots have potential to enhance biogas yield when used as inoculum in production of biogas. Consequently, biogas production at higher yield can significantly reduce the overdependence on fossil fuels and other non-renewable forms of energy.
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