Biogas
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Transcript of Biogas
BIOGASEnergy & Environment
What is Energy? What are different types of energy?
Light & Heat Kinetic & Electrical
Potential
Noise Chemical
Can you create energy?
No.
Energy is conserved.
Energy can be transformed but not
created.
Examples of Energy Transfer
1. Clap Your Hands
Kinetic Noise
Examples of Energy Transfer
2. Rub Your Hands
Kinetic Heat
Examples of Energy Transfer
3. Switch on a light bulb
ElectricalHeat Light
Examples of Energy Transfer
4. Light a match
ChemicalHeat Light
A match is an example of using a fuel
What is fuel?
Examples ?
Wood Oil
Stored Chemical Energy
Chemical
Electrical
Kinetic Heat
Light
Disadvantages of Fuel
Expensive Polluting
Diminishing Resources
Time to gather
What if we had a fuel that was none of these?
Biogas Uses waste material to transfer chemical
energy to other forms of useful energy!
Electrical
Kinetic Heat
Light
Chemical
Different Types of Gas Plant:Gobar Gas Plant
Stops air getting into the digester- creates anaerobic condition
Gas to kitchen
Sludge used as a fertiliser
Real Gobar Gas PlantsVigyan Ashram
Real Gobar Gas PlantsVigyan Ashram
Mixer
Digester Tank
Gas Holder
Sludge
Gas to kitchen
Real Gobar Gas PlantsVigyan Ashram
Gas to kitchen
Latrine
MixerGas collector
Digester
Different Types of Gas Plant:Sausage Bag Gas Plant
Sludge used as a fertiliser
Gas to kitchen
•Quick to construct•May require importing•May require protection from sharp objects and vermin
How Does Biogas Work?Anaerobic Digestion No Oxygen
More Microorganisms
Microorganisms found naturally in cow’s stomach
No Oxygen
Nitrogen and Carbon
Slurry
For Cooking
What is important?Ratio of Nitrogen to Carbon
Too much nitrogen
Too much N means no
growth
1x Nitrogen : 30x Carbon neededIt can be fixed by dilution
What is important?Ratio of water and Nutrients Ratio
1 water :1 solid waste Nutrients
carbon (C) and nitrogen (N)○ N= provide nutrients for the growth and
multiplication of the anaerobic organisms
+ N =
What is important?
StirringPrevents scum growth
Retention TimeEffected by temperature, dilution, loading
rate, etc.A normal period for the digestion of dung
would be 2 to 4 weeksAt high temperature bio-digestion occurs faster
○ Between 20 and 30
Advantages 1x =3kW hours of electricity Save on fossil fuel. Save time collecting fuel. Improve hygienic conditions. Reduce pollution.
Save Money Protect ForestsProduce high quality fertiliser
Summary Questions1. Can you create energy?
2. When you rub your hands what happens(energy transfer)?
3. Name one disadvantage with fuel
4. What two nutrients are important in a biogas plant?
5. Briefly explain what is happening in this picture.