Effect of ratio variation of crop wastes on the production of poultry dung bio-gas
AbstractCrop wastes, (beans husk, yam, cassava, and plantain peels) together with fresh poultry dung were fed into a digester to produce bio-gas, in ratio 4:1 (dung to crop waste). The microbial population of the bacteria present in the organic matter before digestion was between 1.2x105 and 7.6x105cfu/ml, while fungi population was 1.4x103 to 2.5x103sfu/ml.Yeast population was 0.6x103sfu/ml and 1.0x103sfu/ml for yam and cassava peels respectively. The microbial populations during digestion of waste
materials were 2.8x105 to 4.4x105cfu/ml for bacteria, 0.7x103 to 3.2x103sfu/ml for fungi and 1.8x103 to 2.6x103sfu/ml for yeast .The
pH recorded during digestion was between 5.8 and 7.3, while the temperature was between 320C and 390C. Seventeen bacterial species were isolated from the slurry samples, and these include: Staphylococcus aureus, Escherichia coli, Streptococcus pyogenes. Proteus mirabilis, Proteus morganii, Enterobacter aerogenes, Klebsiella pneumoniae, Pseudomonas aeruginosa, Bacillus subtilis, Bacillus licheniformis, Acetobacter orleanensis, Clostridium butyricum, Micrococcus roseus, Lactobacillus delbrueckii, Clostridium spheroides, and Methanobacillus species. Seven fungal species were isolated, Rhizopus stolonifer, Rhizopus nigrificans, Gyrothrix circinata, Mucor mucedo, Aspergillus flavus, Aspergillus niger, Aspergillus fumigatus, and yeast; Saccharomyces cerevisiae. The components of the poultry-dung and crop wastes bio-gas were 74.18% CH4, 4.33%NH3, 3.22%H2S, 8.14% CO2, and 10.12% traces of other unknown gases.
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