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According to reports recently organized by the Physicist Organization Network, American scientists have developed a new type of device that is as large as a household washing machine. It can not only use microorganisms to purify sewage but also generate electricity. The relevant research report was submitted on March 29 at the 243rd American Chemical Society National Conference and Expo.
Dr. Orianna of the Craig Venter Institute said: "We initially improved the prototype of the integrated innovative technology, making it possible to process wastewater more efficiently than before, and the cost was reduced by half; and its energy recovery capability. From 2% to about 13%, if this technology can be commercialized, more electricity can be produced, and sewage can eventually be treated for free, which means that in developing countries or Southern California and other water-scarce regions, This recycling technology makes more wastewater clear.
This new device uses a microbial fuel cell (MFC) that can produce electricity and drinking water using hydrogen and oxygen. The microorganisms naturally present in the sewage are digested to decompose the organic substances in the sludge through metabolism. Dr. Orianna said that the new microbial fuel cell uses sewage obtained from conventional sewage treatment plants and even has the potential to decompose harmful pollutants such as benzene and toluene in the sludge.
In experiments conducted at a sewage treatment plant near San Diego, the facility can process 20 gallons to 100 gallons of waste per week. The researchers replaced the titanium components with graphite electrodes and polyvinyl chloride (PVC) frames. Because of this, the cost of new microbial fuel cells to process waste is about US$150 per gallon, which is only half that of previous prototypes. The team hopes that it will ultimately be able to achieve a more competitive cost than existing water treatment technologies, which will be less than $20 per gallon or less.
At the same time, the efficiency of new equipment is six times that of previous prototypes, and the efficiency of converting sludge into electricity is 13%. The researchers explained that once the equipment has been scaled up, the operating efficiency can reach 20% to 25%, and it can generate enough electricity to run the traditional sewage treatment plant. It is estimated that a typical sewage treatment plant may consume 10,000 households or more of electricity. In the future, microbial fuel cells may replace some existing urban sewage treatment systems. (Hua Ling Editor: Peng Jinmei)
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