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- Title
Effect of ground insulation and feed stock on performance of fixed dome biogas digester.
- Authors
Achuka, Nwoke Oji; Paul, Okeke Chukwuka; Emmanuel, Chukwuma Chibundo; Chukwuemeka, Ime; Frances, Ulasi Ginika; Amagu, Echiegu Emmanuel; Dinobi, Omah Augustine
- Abstract
Digester temperature, the type and composition of material fed into the digester are key requirements for every productive biogas plant, thus their optimization is essential for biogas recovery and sustainability. The aim of the study is to determine the effect of ground insulation and feedstock on performance of fixed dome biogas digester. To achieve this 32-liter fixed dome biogas digester was developed, fed with three feedstocks namely cow abdominal waste (CAW), poultry droppings (PD) and 1:1 mixture of cow abdominal waste and poultry droppings (1:1CAW&PD) and buried underground for insulation before anaerobic digestion process at 30 days hydraulic retention time. The ANOVA result showed that there were significant differences in the slurry temperature, volume of biogas produced and slurry pH respectively at 5% significant levels The TS, VS, protein contents, crude fat, BOD5, C, COD, P, K, TVC and Calorific Value of ground insulated digester were higher than that of uninsulated surface digesters for the three different feedstocks at the end of the 30 Days digestion. GC analysis of biogas showed that the percentage compositions of methane produced were 68.39%, 64.33%, 66.41%, 61.79%, 57.74%, and 59.24% for underground with CAW, underground with PD, underground with 1:1CAW&PD, uninsulated with CAW, uninsulated with PD, and uninsulated with 1:1CAW&PD, respectively. The underground insulated biogas digester produced more methane than their counterpart uninsulated digesters containing the same feedstock signifying the importance of temperature regulation through insulation. In terms of the feedstock, the CAW performed better than the PD in both the underground and uninsulated digesters. They mixture of 1:1CAW&PD also showed better performance in methane production than the single anaerobic digestion of poultry dropping alone indicating efficiency and importance of co-digestion of feedstocks. The study has shown that underground insulation of the fixed dome biogas digesters improved biogas production. We therefore recommend its application by the biogas industry because is cost-effective and will help to reduce the effects of economic barriers to investment in biogas systems.
- Subjects
BIOGAS; BIOGAS production; TEMPERATURE control; BIOGAS industry; ANAEROBIC digestion; RF values (Chromatography); ANIMAL feeds; SLURRY
- Publication
Agricultural Engineering International: CIGR Journal, 2023, Vol 25, Issue 2, p145
- ISSN
1682-1130
- Publication type
Article