Solar desalination for around one-third the cost using blocks of carbonized compressed powder (CCP)
https://discovery.kaust.edu.sa/en/article/1181/coal-product-used-to-create-green-clean-water
"material produced by forcing powdered coal together under pressure... the team incorporated cotton fibers through the material... condenser over the device captured the freshwater... A 16 square meter CCP desalination system could produce enough water to meet the drinking, cooking and vegetable-watering needs of a typical [third-world farm] family of four... already being progressed by commercial partners toward pilot-scale production of drinking water"
Related:
Upscaling 3D Engineered Trees for Off-Grid Desalination
Passive, inexpensive solar evaporation system could be used to clean wastewater, provide potable water
https://news.mit.edu/2022/solar-desalination-system-inexpensive-0214 see also: Solar-powered desalination system requires no extra batteries https://news.mit.edu/2024/solar-powered-desalination-system-requires-no-extra-batteries-1008
From seawater to drinking water, with the push of a button
New Device Purifies Saltwater Over a 1000 Times Faster Than Standard Industrial Equipment
Salt-rejecting microchannels help make seawater drinkable using the power of the sun
New technology is five times more efficient than current desalination techniques
New solar desalination device makes 3.4 liters of fresh drinking water per hour
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