Sorry its been a few days since I have posted anything new but I have been busy worrying about my electricity bill. Sure makes me wish I had solar cells on my roof and gobar powered fuelcells operating off my septic system. We have enough wind here in Florida that an electric windmill would be a good investment too.
Unfortunately septic tank fuel cells don't seem to be designed for American homes. Most work done on the subject of energy from home waste is designed for third world extreme rural settings or for commercial waste systems and frequently uses gobar or biogas for heating or cooking or producing fuel for vehicles.
My first experience with fuel cells came when my father helped my older brother built one for science fair project about 1960. We used a potassium hydroxide solution and electrodes made from carbon rods scavenged from dry-cell batteries. Holes were drilled through the rods. One rod was simply open to the air and the other was supplied with butane from a blow-torch bottle. As I remember, the cell was simply connected to a voltmeter to show that it did produce a voltage.
Much of the early work on fuel cells was done by scientists who were also working on the development of electrical cells or batteries. This is logical since the primary difference between electrical cells and fuel cells is that conventional electrochemical cells and fuel cells is that the fuel is built into the cell and is used up in the conventional cell and is supplied from outside in the fuel cell and can be replaced continuously. A rechargeable cell can have the fuel replaced by running an electrical current in the reverse direction and undoing the chemical process in the cell.
The earliest known fuel cells were made around 1839 by William Robert Grove based on research by Christian Friedrich Schonbien. The first commercial use of fuel cells was in the U.S. space program for project Gemini.
Some fuel cells use bacteria to produce electricity but are not very efficient. The one real benefit is that the process yields pure water from wastewater at a very low cost. Australia has done the most work on this type of fuel cell because of their ability to purify water.
The use of gobar or biogas to power fuel cells is a much more successful proposition than bacterial fuel cells. Many manufacturing installations have installed gobar powered fuel cell plants to process waste from their installation. The cost of these units are coming down and the hope is that this will lead to the development of small units. Perhaps someday I'll be able to have my septic tank fuel cell.
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