Abstract
The effects of the incorporation of various wastes with castor cake in relation to biogas generation and digester microbiological activities were determined. The physico-chemical properties of cowdung, castor cake, maize cob (grain removed), mixed vegetable wastes and weed samples and their proportion of mixing for the preferential development of efficient microbial consortia and gas output were characterised. The nitrogen, phosphorus and potassium values were determined to estimate the value of digested wastes as a manure. A maximum gas output (18·3 litres) over a period of 6 weeks with maximum reductions of 75·4% of Total Solids (TS), 71·8% of Volatile Solids (VS) and 2620 mg litre −1 of Volatile Fatty Acids (VFA) was observed. The study provides evidence that, with proper C:N ratio adjustments, various types of wastes along with castor cake, could profitably be employed for maximum microbiological activity and gas output.
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