Use seas more to get drinking water

When there is an acute shortage of water both for drinking and for industry and agriculture, the technology of desalination which turns seawater or brackish water into fresh drinking water becomes very important.

Even drinking water is in short supply in urban areas. If one were to adopt a ration of 2.5 liters of drinking water per person, a 100,000 cu m plant would relieve 40 million people with a daily necessity at a capital cost of $3 per person.

China has a coast line of 32.647 km and there are more than 100 cities with an extreme scarcity of water. In 2006, the construction of the largest seawater desalination factory in Asia was started in Dagang district, Tianjin. When finished it could provide up to 150,000 tons per day.