With the depletion of the conventional energy sources like fossil fuels, uranium, etc, demand for renewable energy sources is increasing.

Now, Biogas is in the race of becoming one of the major renewable energy of future. But, it is suffering from certain setbacks which make it quite difficult to produce it at commercial level. However instances are their where many countries are producing at a large scale. But, still its current method has not gained worldwide acceptance as other sources like oil, coal, natural gas, wind, etc. has gained.

Some setbacks are:

1. Removal of impurities like carbon dioxide, etc at a cheaper cost i.e. to reduce the purification cost of biogas.
2. Increasing the output of gas.

So, taking that into consideration I suggest two modified models of biogas digester which might make its use a lot more favorable.

MODEL 1:

MODIFIED DESIGN (I) OF BIOGAS DIGESTER

So, my design shown above is meant to solve the above to problems to some extent.

In my design I have incorporated an immobilized Carbonic anhydrase into the digester. This enzyme will catalyze the conversion of carbon dioxide (CO2) to carbonic acid (H2CO3).

Now, this carbonic acid can be used to make sodium carbonate (Na2CO3) or sodium bicarbonate (NaHCO3) by adding sodium hydroxide (NaOH).

H2CO3 +NaOH → Na2CO3 + H2O

Now, this way our two problems will be solved:

1. The carbon dioxide produced during anaerobic fermentation will be simultaneously converted to sodium carbonate (Na2CO3) or sodium bicarbonate (NaHCO3), which has many applications like acidity regulator, anticaking agent, raising agent, stabilizer, etc.
2. Secondly, more free space is available for methane to occupy as the space which was previously used carbon dioxide is now free. This will help in generating more gas in the given space and time.

MODEL 2:

MODIFIED DESIGN (II) OF BIOGAS DIGESTER

In this model, rather than adding NaOH in the digester, carbonic acid sent to the overflow tank can be used as carbon dioxide source. Since, carbonic acid is unstable; it will dissociate to produce carbon dioxide which can be sent to dry ice production chamber for producing dry ice. Now, this dry ice can be used as a cooling agent, etc.

So, in this way we can modify the biogas digester to make biogas production more efficient and commercially viable product.

CO2 + H2O+ Carbonic anhydrase → H2CO3

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