presentation about the what is biogas, diffterent types of biogas plant, traditional vs modern, nisargruna biogas pant and detailed analysis about why to install biogas unit.

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3. • Biogas is a mixture of methane and carbon dioxide
produced by the bacterial decomposition of organic
wastes and where methane is used a cooking fuel.
• The organic wastes that can be included in biogas plants
are:
Cow dung waste
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4. Biogas
plants
Conventional
Domed
shape
Floating
type
Modern
Nisargruna
biogas
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5. • In conventional biogas plant, biogas is produced
by anaerobic digestion with anaerobic bacteria
or fermentation of biodegradable materials such as manure,
sewage, municipal waste, green waste, plant material, and
crops.
• Gas produced is primarily methane (CH4) and carbon
dioxide (CO2) and may have small amounts of hydrogen
sulphide (H2S), moisture and siloxanes.
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6. There are two types of conventional biogas plant :
• Fixed dome biogas plant
• Floating drum biogas plant
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7. • A fixed-dome plant comprises of a closed, dome-shaped
digester with an immovable, rigid gas-holder and a
displacement pit, also named 'compensation tank'.
• When gas production starts, the slurry is displaced into
the compensation tank.
• Gas pressure increases with the volume of gas stored.
• If there is little gas in the gas-holder, the gas pressure is
low.
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9. • Relatively low construction costs.
• The absence of moving parts and rusting steel parts.
• If well constructed, fixed dome plants have a long life
span.
• The underground construction saves space and protects the
digester from temperature changes.
• The construction provides opportunities for skilled local
employment.
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10. • Fluctuating gas pressure complicates gas utilization.
• Amount of gas produced is not immediately visible.
• Fixed dome plants need exact planning of levels.
• Excavation can be difficult and expensive in bedrock.
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11. • A floating-drum plant consists of a cylindrical or dome-shaped
digester and a moving, floating gas-holder, or drum.
• The gas-holder floats either directly in the fermenting
slurry or in a separate water jacket.
• The drum in which the biogas collects has an internal
and/or external guide frame that provides stability and
keeps the drum upright.
• If biogas is produced, the drum moves up, if gas is
consumed, the gas-holder sinks back.
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13. • Floating-drum plants are easy to understand and operate.
• They provide gas at a constant pressure.
• The stored gas-volume is immediately recognizable by the
position of the drum.
• Gas-tightness is no problem, provided the gasholder is de-rusted
and painted regularly.
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14. • The steel drum is relatively expensive and maintenance-intensive.
• Removing rust and painting has to be carried out regularly.
• The life-time of the drum is short (up to 15 years; in
tropical coastal regions about five years).
• If fibrous substrates are used, the gas-holder shows a
tendency to get "stuck" in the resultant floating scum.
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15. Nestle:
• At around 28 plants of nestle there exist biogas
units. They use cow manure to generate biogas and bio-fertilizers
in order to reduce the environmental impact.
environment
Biogas plant installed in nestle, Mexico 15

16. • KhanKhel Dairy Farm:
• Biogas-generated electricity from a dairy manure digester
in Punjab (Pakistan) is being used for water pumping at a
dairy farm.
Biogas generated is being used to generate electricity 16

17. • Biogas plant at Pepsico Pune:
• 18MT of waste per day
• 2500 M3 of biogas per day
• Saving 140MT of LPG and approximately cost of $140
million per annum.
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19. Nisargruna technology honoured with
Padma Shri Award 2013
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20. The main steps of Nisargruna (biogas) production :
1. Hydrolysis
2. Acidification
3. Methane formation
Plant setup comprises :
• Receiving Platform
• Segregating Platform
• Mixer
• Pre-digester tank
• Main Tank (Secondary Digester)
• Manure
A combination of Aerobic + Anerobic Digestion
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21. Comparison with Conventional Plant
Nisargruna Biogas Plant Conventional Biogas Plant
Conventional Biogas Plant
Higher costing Lower costing
Settling tank for water recycling No water recycling
Broader scope of raw materials Mainly based on cow dung
Biogas has a better fuel value Biogas has low fuel value
Mixers are used for better
homogenization
No homogenization
High rate of bio-methanation process Low rate of bio-methanation process
Pre-digestion in aerobic chamber No set-up for pre-digestion
Removal of scum forming protein
materials
No set-up to remove scum forming
material
Improved structure for better flow,
entrapment and enrichment of biogas
Conventional dome structure
Lower CO2 and higher methane levels
in biogas
Higher CO2 levels in biogas
More hygienic and less smell Less hygienic and more smell
Higher plant life (40 years) Normal plant life
Manure has high organic content and is
weed free
Manure is generally of not very high
quality
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22. • Renewable source of energy
• Non polluting.
• Reduces landfills
• Cheaper in cost
• No problem to warm the water in
Nisargruna technology as in includes
Solar panel.
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23. • Need for regular and optimum feeding in the digester.
• Egg shell, bones cannot be included as the reduces the
efficiency of the plant.
• Regular addition of warm water in winters to maintain the
optimum temperature for bacteria.
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24. Cost of LPG (Commercial 19 KG cylinder)= ₹ 88.52/kg
Nisargruna biogas plant of 0.5 MT
Plant construction cost: ₹ 15Lakhs (without subsidy)
Plant construction cost : ₹ 9 Lakhs (with subsidy)
Total gas production =25 Kg/day (equivalent to LPG)
Total cost of biogas = 25X88.52X365(days)= ₹ 8.07 Lakhs
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25. Profit from sale of manure =50(kg) X 5 X 365= ₹ 0.91 lakhs/-
Total profit generated = ₹ 8.98/-
Payback period = 15/8.98
=1.67 years (without subsidy)
Payback period = 9/8.98
= 1.002 years (with subsidy)
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