Post on 12-Sep-2014
description
Biogas & Organic Fertilizer
Production
M.M.Palitha Mahinda MunasingheFarm Mechanical Instructor
palithamahinda@yahoo.com
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
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Biogas
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Composition of Biogas
Compound Molecular formula %
Methane CH4 50–70Carbon dioxide CO2 30–40Nitrogen N2 1–2Hydrogen H2 5–10Hydrogen sulfide H2S 0–2Water Vapor H2O 0–3
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Build a Artificial DigesterIt is a system that promotes
decomposition of organic matter It produces Methane gas through the
process of anaerobic digestion
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How Can It Produce
Retention time of 50 to 60 days seems desirable is needed & depending on temperature (100C-300C)
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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)
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Anaerobic Digestion
It is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen
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Types of Dung Gas Production Per Kg Dung (m3)
Cattle (cows and buffaloes) 0.023 - 0.040 Pig 0.040 - 0.059 Poultry (Chickens) 0.065 - 0.116 Human 0.020 - 0.028
Gas Production potential of various types of dung
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Liquefaction - HydrolysisAcid Production - AcidogenesisAcetate Production- AcetogenesisMethane Production-
Methanogenesis
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Process stages of digestion
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Construction of Fixed Dome Digester
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V1
V2
V3
RD
h1
h3
h230° 40°
Hydraulic Chamber
Digester
V1= ∏/6h1(3R2 + h12 )
(h1=D/5)V2= ∏R2 h2
V3= ∏/6h3(3R2 + h3
2 ) (h3=D/8)
( h = D/2.5)
09/25/2012
Construction of Fixed Dome Digester
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Construction Steps of Digester
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Other Designs
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Other Designs
Floating Drum Type09/25/2012
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Can be used for Cooking, Heating, Electricity generate, and Running engines
Usage
09/25/2012
This technology is best suited to convert the organic waste from agriculture, livestock, industries, municipalities and other human activities into energy and manure
Reduce Smell around living areaThe Emission of Greenhouse
Gases Pathogen level Methane emission from landfills
Improve value of Organic fertilizerProtect water resources
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Benefits of Anaerobic Digestion
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