Hotels use a lot of hot water, typically heated by gas. A device from a Canadian company can capture the carbon dioxide and turn it into a useful product, potash, that can be used to make soap or other products. The device also captures waste heat which can then preheat water or warm rooms.

Inside a Radisson hotel, hidden in a mechanical room, a black box roughly the size of two refrigerators is connected to the hot water heaters (which a hotel uses a lot). But they’re not to make the water hotter. The system helps capture CO2 whenever guests take a shower. The technology, from the Canadian company Clean02, reduces emissions from buildings by converting the CO2 from water heaters or furnaces into an ingredient that can be used to make soap or shampoo.
Flue gas enters the chamber and reacts with potassium hydroxide. Every few weeks…
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