Question

Find out structure and function of biogass

Answer 1

The biogas plant has a dome like structure built with bricks. A slurry of cow dung, vegetable wastes, crop residues etc is mixed with water and made into a slurry, and fed into the digester. ... The bio gas gets stored in the gas tank above the digester from which they are drawn through pipes for use.

and this is a very useful and helpful and eco friendly fuel

Answer 2

Hey mate!!

Here's the answer

Ans.-1. Airtight Environment-: The most common method of creating a continuous flow digester is the Ziploc baggie and “teapot” or “P-trap” shape.

2. Water content-: 40% material 50% water 10% gas.

3.Heat-: Temperature can be controlled a few different ways. In China, digesters are typically buried underground. This way they can be overloaded in winter months to maintain consistent gas production. Other designs employ a greenhouses or hoop house over them. More advanced systems integrate some kind of heat exchanger, which can be heated with solar collectors. Regardless of your design, avoid using biogas or any other fuel to heat your digester. Make sure energy you use is excess energy on its way to being wasted.

There are 3 kind of temperature

Thermophile (40 degree C to 60 degree C) biogas generates more in this range of temperature.

Mesophile (20 - 40 degrees C) 35 degree C is ideal temperature for biogas generation

Psychrotrophs ( -15 and 10 degrees C or lower) very less biogas is generating in this range of temperature.

These above factors are controlled by design of main digester

4. pH of the digester-: Neutral pH is an important parameter in anaerobic digestion, just as it is for aerobic composting. If pH is measured at the inlet, it will be slightly lower than neutral — usually around 5.5 — as fresh material is converted into acids. The pH will neutralize as these acids are converted into methane gas. By the time the liquid bio-fertilizer comes out the digester, it should be 7. If the pH of the bio-fertilizer is lower than this, it is an indicator the digester has been over-fed and is at risk to “sour,” or stop working due to low pH. If the pH at the inlet goes below 5.5, it is necessary to add some wood ashes or lime to buffer the digester. A soured digester has no bubble activity and instead of producing gas, instead it draws air into it. The top will be sucked in tightly against the surface of the liquid and if a brewer’s airlock is being used, the water in the airlock will be sucked into the digester. Restarting a soured digester is time consuming, and in most cases it is simpler to dump it out and start over.

5. Feedstock -: Biogas production is best at the 25:1 C:N ratio as aerobic composting. Cattle manure is most common feedstock for biogas because cattle manure is naturally the perfect 25:1 carbon-to-nitrogen ratio. Cattle manure makes an excellent feedstock to begin

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