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Title: Techno-economic assessment for biogas generation for energy usage from municipal sewage sludge using Acti-zyme as digestion catalyst
Authors: Manyuchi, MM 
Ikhu-Omoregbe, DIO 
Oyekola, Oluwaseun 
Gwarimbo, W 
Nkomo, D 
Gwarimbo, W 
Keywords: Acti-zyme;Biogas;Bio-nutrients;Bio-solids;Sewage treatment;Techno-economic analysis
Issue Date: 2016
Publisher: Chemical Science International
Abstract: 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
Appears in Collections:Eng - Journal articles (DHET subsidised)

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