In a criminal novel, there is such a sentence: "For you, it is nothing but urine. For me it is bread and butter." Coincidentally. The BioEnergy team led by Dr. Ioannis Ieropoulos of the Bristol Robotics Laboratory in the United Kingdom is preparing to make use of people's excrement to make money. They have developed a new technology that can convert urine into electricity. Every year people throughout the world are estimated to produce 6.4 trillion liters of urine. The Bristol Robotics Laboratory, in cooperation with the University of Bristol and the University of the West of England, is ready to make full use of this rich resource. The heart of urine power generation technology is the microbial fuel cell (MFC), which contains many active microorganisms. When urine flows through the MFC, microorganisms “engulf†the urine and release electrons. The electrodes at both ends of the battery will collect these electrons, and when they are connected to external circuits, they will generate current. The team at the Bristol Robotics Laboratory installed a series of cigar-size MFCs in a single unit and connected the unit to the urinal outlet. Fresh urine can then flow through these microbial fuel cells. The "fresh" mentioned above refers to the urine discharged from a healthy person with normal weight and height, and the time does not exceed one week. In previous experiments, MFC was not urine, but food debris, insect carcasses, and grassy debris. But in comparison, urine produces three times more electricity than other waste. Why is the effect of urine power generation so good? Eropulos believes that in previous experiments, microorganisms were fed quickly because of the high percentage of organic matter in the waste. The urine contains less organic carbon, better acidity and electrical conductivity, so it produces better electricity. Urine even has the potential to charge commercial batteries, including smartphone batteries. This research has been supported by many organizations, including the Gates Foundation. The current study is still in its early stages, but it has shown great potential for urine to provide renewable energy. Moreover, it can also generate a commercial incentive to encourage people to build more toilets - now more than 2.5 billion people worldwide have no basic sanitation facilities. In addition, Airopoulos and his team are also investigating the possibility of using feces to generate electricity.
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