Session 5.1 Potential use of Cassava Wastes to Produce Energy: Outcomes of a Feasibility Study in...

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Transcript of Session 5.1 Potential use of Cassava Wastes to Produce Energy: Outcomes of a Feasibility Study in...

  • 1.The IFAD Regional Cassava Processing and Marketing Initiative THE USEOF CASSAVA WASTES TO PRODUCE BIO-ENERGY:OUTCOMES OF A FEASIBILITY STUDY IMPLEMENTED IN GHANA 18-19 October 2010 IFAD - RTIMP, Ghana What has been done and what can be done

2. INTRODUCTION 3. The question Can cassava wastes and other available biowastes be profitably converted into bio-energy by utilizing existing technology? THE USEOF CASSAVA WASTES TO PRODUCE ENERGY: OUTCOMES OF A FEASIBILITY STUDY IMPLEMENTED IN GHANA 4. Why this study? Local availability of bio-masses : In Ghana >11 million/MT/year of cassava roots are produced (2008, FAO). Out of them, 2,2 million MT are either peels (13%) or roots unfit for processing (6-7%). Other bio-masses (from wood) also easily available in large quantities (wood shavings/saw dust) Cassava wastes (peels, barks, effluents): Haveno market value ; It is afinancial costto dispose them off; Seriousenvironmental hazard : pollute soils, table waters, air; Health hazardfor this industrys workers ( social cost ) HOW TO TURN A COST INTO A PROFIT 5. CASSAVA PEELS AND WASTEWATERS POLLUTE THE ENVIRONMENT 6. Gasification Blend of biomasses Blend of gases (producer gas) Electricity (mainly) +Heat (hot/cold air) AVAILABLE TECHNOLOGIES: PRODUCTION OF BIO-ENERGY FROM WASTES Bio-methanation (biogas) Wastewaters Methane Heat (mainly) 7. THE GASIFICATION PROCESS (THE GASIFIER ) 8. Several biomasses are being successfully utilized as feedstock forgasification:wood chips; coconut shell; bamboo; maize stalks; cotton stalks; rice husk; bagasse; groundnut shells;tea and coffee wastes; corn cobs; cashew nut shell, etc. Lack of data on suitability of cassava wastes and wood wastes required implementation of proximate laboratory analyses BIOMASS SUITABLE FOR GASIFICATION Outcomesof laboratory analyses Cassava peels/barks: ash content (