According to the University of Colorado in Boulder, 7 liters of water is used to produce 1 liter of a foam drink with modern technology. Part of it goes into processing, but the rest of the volume is drained into the sewer. Meanwhile, it’s not waste, it’s an extremely nutritious medium, convenient for growing mushrooms , which can become part of environmentally friendly batteries.
In their experiments, scientists populated the brewery’s wastewater with spores, heated the mixture and shaken for 2 days. Growing giant and densely populated colonies of microorganisms were filtered from the liquid and baked at 800ºC. Charred dense remains are a storehouse of carbon, almost ready electrodes for new batteries.
In terms of its properties, this material is “the best one currently used” when creating lithium-ion batteries. And the remaining water passes a natural cleaning cycle and is again suitable for use in the brewery. If you organize the process of sewage treatment on an industrial scale, this will also reduce the burden on sewage systems.
The technology of growing bioelectrodes from beer waste is already patented, and the new company Emergy will develop it.