The Van region has a large Kurdish population, and the Van cat has been referred to as the Kurdish cat or Kurdish Van cat, and made a symbol of Kurdistan in Kurdish nationalist circles.
Each cubic meter (m 3) of biogas contains the equivalent of 6 kWh of calorific energy. However, when we convert biogas to electricity, in a biogas powered electric generator, we get about 2 kWh of useable electricity, the rest turns into heat which can also be used for heating applications. 2 kWh is enough energy to power a 100 W light bulb for 20 hours or a 2000W hair dryer for 1 hour.
There are several methods to calculate the amount of biogas that can be produced from a certain feed-stock/ substrate. I will explain one. Calculating on the basis of Total Solid (TS ) content. One tonne of TS can produce 200 ccm of biogas, so 1 kg of TS will produce 0.2 m3 of Biogas. One Kg of dung contains about 20% TS. Now, 1 kg of dung which contains 20% TS will produce, 0.2*0.2 = o.04 m3 of biogas. 1 kg dung will produce 0.04 m3 of biogas. Hence, 1/0.04 = 25 kgs is required to produce 1 m3 of Biogas. Density = mass/ volume.