Abstract
Substances have different degrees of degradability. Low degradability of substrates is one of the factors that hinder the production of biogas from organic substances. To overcome this low degradability of substrates, mixing is important for most of the substrates. With the aim of maximizing biogas yields from co-digestion of banana fruit peel and poultry manure, a series of experiments were carried out under mesophilic conditions at 38 ºC using batch digester operating for 25 days hydraulic retention time (HRT). Anaerobic degradability test with mix of 5 different proportions were carried out to obtain suitable mix ratio for maximum biogas production from co-digestion of BP and PM. The objective of this study was to determine the biogas yield from solo and co-digestion of BP and PM. Production of biogas through anaerobic digestion of organic waste materials provides an alternative environmentally, eco- friendly renewable energy. In all treatments; TS, VS, organic carbon and pH were measured before and after digestion. The daily biogas production was subsequently measured by water displacement method for 25 days. Gas production was noticed in all of the substrate types from the first day up to the 25 th day of digestion. Assessment of cumulative biogas production revealed that substrates in mix ratios showed high biogas yield. The highest yield was recorded insubstrate mix ratio of 50% BP+ 50% PM, suggesting that this mix ratio of the two substrates is an optimal mix to yield better amount of biogas. Overall results indicated that production of biogas yield from substrates and reduction in VS and TS can be significantly enhanced when BP and PM are co-digested. Keywords : Banana peel, Biogas, Co-digestion, Poultry manure, Total solids, Volatile solid DOI: 10.7176/JETP/10-2-03 Publication date: April 30 th 2020
Highlights
Renewable energy resources are being used as the major contributors of the global energy demand (Converti et al, 2009)
The Physico-chemical characteristics of banana fruit peel (BP) and poultry manure (PM) as main substrates and co-substrates mixed in different ratios for co-digestion were presented in table 2
The pH of 100% BP slurry and 100% PM before AD were 6.87±0.06 and 6.88+0.07, respectively. These values were relatively lower than the two substrates mixed, and this suggests that mixing the two substrates will raise the pH value toward optimum level recommended for anaerobic digestion in biogas production (Hills and Roberts, 1981)
Summary
Renewable energy resources are being used as the major contributors (with approximately 24% contribution) of the global energy demand (Converti et al, 2009). Biogas is an alternative and renewable energy source produced through anaerobic digestion process, which is a natural biological process in which an interlaced community of bacteria cooperate to obtain fermentation through assimilation, transformation and decomposition of organic matter into biogas This is a complex multistep process in terms of microbiology, where the organic material is degraded to obtain methane gas under the absence of oxygen. This organic matter can include manure or plant substrates like crops or food waste, for example, fruit peels These inputs are fed into anaerobic digester where microbes in the presence of heat and absence of oxygen break down organic matter and Ethiopia is one of the top ranking countries in Africa and among the first ten in the world in terms of livestock resource (FAO, 2009). Anaerobic digestion consists of several interdependent, complex sequential and parallel biological reactions in the absence of oxygen during which the products from one group of microorganisms serve as the substrates for the resulting in transformation of organic matter (biomass) mainly into a mixture of methane and carbon dioxide commonly referred to as biogas (Werner et al, 1989)
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