From：CTECHI GROUP Limited Release time：2019-02-26
Overview：Today coal, oil and natural gas are the main energy sources in human life. With the development of human society and the improvement of living standards, more and more energy needs to be consumed. However, these natural gifts of energy materials are gradually accumulated through tens of millions of years of crustal change, although the number is large, but after all, it is limited. Therefore, people will eventually face an energy crisis one day.
Today coal, oil and natural gas are the main energy sources in human life. With the development of human society and the improvement of living standards, more and more energy needs to be consumed. However, these natural gifts of energy materials are gradually accumulated through tens of millions of years of crustal change, although the number is large, but after all, it is limited. Therefore, people will eventually face an energy crisis one day.
Of course, people can get energy in many ways. Solar energy, for example, is a huge source of energy. In addition, geothermal, hydraulic and nuclear fission can emit a lot of thermal energy. Experiments show that microbial power generation has a bright future for people.
There are many kinds of batteries, and fuel cells are the latest in the family. Generally, batteries are composed of three parts: positive, negative and electrolyte. The same is true for fuel cells: chemical reaction of fuel at the negative end, loss of electrons; reaction of oxidant at the positive end, get electrons running from the negative end through the wire. Like ordinary batteries, current passes through the wire.
Fuel cells can be fueled by hydrogen, hydrazine, methanol, formaldehyde, methane and ethane, and oxidized by oxygen, air and hydrogen peroxide. Now we can use the so-called "electrode active substance" produced by microorganisms'life activities as fuel for batteries, and then convert chemical energy into electric energy by means similar to fuel cells, so as to become microbial batteries.
As the electrode active material of microbial batteries, hydrogen, formic acid, ammonia, etc. For example, many hydrogen-producing bacteria have been found. Among them, there are more than 30 kinds of heterotrophic bacteria, which can ferment sugar, alcohols, organic acids and other organic substances, absorb the chemical energy to meet their own needs of life activities, while releasing the energy of the other part in the form of hydrogen. With this hydrogen as fuel, hydrogen-oxygen microbial batteries can be produced.
What about the urine emitted by astronauts in a sealed spacecraft? NASA has devised a clever scheme: using Bacillus in microorganisms to treat urine, producing ammonia gas, and using ammonia as the active material of electrodes, microbial batteries are obtained, which can treat both urine and electricity. Usually under space conditions, 47 watts of electricity can be obtained for every 22 grams of urine discharged. In the same way, microorganisms can also get nutrients and energy from organic matter in wastewater to produce fuel for batteries.
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