11th Day in Brazil--- Biogas and Itaipu Dam in Iguassu
Today we visited the last two places, cow farm and Itaipu Dam. In the cattle farm, most power is from biogas which is produced from the waste of cows. I was not surprised by the high efficiency of their biogas tank.The interesting thing is that the tanks are built as half underground. I asked them why not build an underground one which has larger bulk and can last longer.The answer was that this whole area is abundant in underground water which was an obstacle for any kind of underground tank. The total cost of the whole biogas system is $25,000 which is relatively lower than others. They did a good job on that.
Itaipu Dam, the largest hydraulic facility in the world.
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