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  • 1. Biogas & Organic Fertilizer Production M.M.Palitha Mahinda Munasinghe Farm Mechanical Instructor palithamahinda@yahoo.com
  • 2. Biogas  An odorless and colorless gas that burns with clear blue flame  It is generated by the activity of anaerobic bacteria  The heating value of biogas is about 60% of natural gas and about 25% of propane mmpmm 09/25/2012 2
  • 3. Composition of Biogas Molecular formula % Methane CH4 50–70 Carbon dioxide CO2 30–40 Nitrogen N2 1–2 Hydrogen H2 5–10 Hydrogen sulfide H2 S 0–2 Water Vapor H2O 0–3 Compound mmpmm 09/25/2012 3
  • 4. How Can It Produce  Build a Artificial Digester  It is a system that promotes decomposition of organic matter  It produces Methane gas through the process of anaerobic digestion Retention time of 50 to 60 days seems desirable is needed & depending on temperature (100C-300C) mmpmm 09/25/2012 4
  • 5. Input biodegradable materials Forms of biomass may be used along with water  Animal dung, Poultry wastes & Human excreta  Farm wastes (Husk, grass, weeds, Straws etc.)  Industrial wastes (Saw dust, wastes from food processing industries)  Domestic wastes (Vegetable peels, waste food materials from kitchen) mmpmm 09/25/2012 5
  • 6. Anaerobic Digestion It is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen mmpmm 09/25/2012 6
  • 7. Gas Production potential of various types of dung Types of Dung Cattle (cows and buffaloes) Pig Poultry (Chickens) Human mmpmm Gas Production Per Kg Dung (m3) 0.023 - 0.040 0.040 - 0.059 0.065 - 0.116 0.020 - 0.028 09/25/2012 7
  • 8. Process stages of digestion Liquefaction - Hydrolysis  Acid Production - Acidogenesis  Acetate Production- Acetogenesis  Methane ProductionMethanogenesis  mmpmm 09/25/2012 8
  • 9. Construction of Fixed Dome Digester mmpmm 09/25/2012 9
  • 10. Construction of Fixed Dome Digester V1 h1 30° Hydraulic Chamber 40° Digester h2 V2 V3 h3 R D V1= ∏/6h1(3R2 + h12 ) (h1=D/5) V2= ∏R2 h2 V3= ∏/6h3(3R2 + h32 ) (h3=D/8) ( h = D/2.5) mmpmm 09/25/2012 10
  • 11. Construction Steps of Digester mmpmm 09/25/2012 11
  • 12. Other Designs mmpmm 09/25/2012 12
  • 13. Other Designs Floating Drum Type mmpmm 09/25/2012 13
  • 14. Usage  Can be used for Cooking, Heating, Electricity generate, and Running engines This technology is best suited to convert the organic waste from agriculture, livestock, industries, municipalities and other human activities into energy and manure mmpmm 09/25/2012 14
  • 15. Benefits of Anaerobic Digestion    mmpmm Reduce  Smell around living area  The Emission of Greenhouse Gases  Pathogen level  Methane emission from landfills Improve value of Organic fertilizer Protect water resources 09/25/2012 15