✍ Scribed by K.I. Ekpenyong; J.D.E. Arawo; A. Melaiye; M.M. Ekwenchi; H.A. Abdullahi
No coin nor oath required. For personal study only.
In an extension of an earlier study of the formation of a mixture of methane, propane and carbon dioxide in the biodegradation of solvent-extracted elephant grass lignocellulose using pure microorganism cultures unextracted (crude) elephant grass stalk was used. The effects of mixed microorganisms (instead of pure cultures), potato dextrose agar (PDA) and nutrients (PO:-SO:-, urea, o,L-asparagine) were studied. In addition, the effectiveness of mixed microorganisms harnessed directly from the air on substrate samples was also investigated. The results showed good correlation with those of the earlier study. The extent of biogas formation was found to depend on the concentration of elephant grass and to be first-order with respect to the latter. PDA and all the nutrients enhanced biogas formation. Urea was most effective at the lower concentrations. Systems with microorganisms harnessed directly on the substrate by prior exposure to air degraded practically as efficiently as those treated with mixed cultures.
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