Browsing by Author "Oyekola, O. O."

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    ACTI-ZYME BIOCHEMICAL PROPERTIES: POTENTIAL FOR USE IN ANAEROBIC SEWAGE TREATMENT CO-GENERATING BIOGAS
    (Asian Journal of Science and Technology, 2015-03) Manyuchi, M.M; Ikhu-Omoregbe, D. I. O; Oyekola, O. O.
    The biochemical properties for Acti-zyme, a biocatalyst were characterized for potential use in anaerobic sewage treatment with the aim of producing biogas. Sterile Acti-zyme media containing peptone water was plated on the MacConkey Agar, Starch Agar, Kliger Agar, Urease Agar, Sulphide Indole and Motility Agar at 37.5°C for 24 hours, at a pH of 7±0.2. Acti-zyme was found to be immotile and contained several enzymes that have different applications in sewage treatment. These included catalase which detoxified harmful substances, protease which broke down the proteins as well as amylase which broke down the polysaccharides available in sewage. However, Acti-zyme did not contain urease; an ammonium catalyzing enzyme. Acti-zyme did not to promote H2S production which is a contaminant in biogas production. Acti-zyme also did not contain pathogenic Enterobacteriaceae such as E. Coli and Salmonella. The identified Acti-zyme biochemical properties make it useful in sewage treatment co-producing biogas
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    TECHNO-ECONOMIC ASSESSMENT FOR BIOGAS GENERATION FOR ENERGY USAGE FROM MUNICIPAL SEWAGE SLUDGE USING ACTI-ZYME AS DIGESTION CATALYST
    (Chemical Science International, 2016-01-21) Manyuchi, M.M; Ikhu-Omoregbe, D.I.O; Oyekola, O. O.; Gwarimbo, W
    A sewage plant with a capacity of 19 600 m3 /day was considered for techno-economic assessment, with an operating efficiency of 60% and a life span of 20 years. $5.125/day of Acti-zyme were required for production of 12 769.69 kg/day for biogas costing $1.50/kg and 672.08 kg/day of bio-solids costing $16.00/50kg. Capital budgeting techniques were then used for techno-economic assessment of sewage treatment recovering biogas and bio-solids. A net benefit of $5 656 363.92 per annum for using the Acti-zyme technology in sewage digestion was forecasted, whilst a net energy of 1 387.33 KWh was set to be produced. An investment of $22 199 501.40 was required for kick-starting the project. A positive net present value of $1 186 239.23 was realized with an internal rate of return of 17.6% and a payback period of 5.9 years. For breakeven to be realised, only 183 059.16 KWh must be produced. The techno-economic assessment indicated it is viable to treat sewage using Acti-zyme co-harnessing biogas and bio-solids as valued added products to an extent of making 0.04% to the Zimbabwe gross domestic product.