Water reuse

Clemson University researchers have shown that man-made or constructed wetlands can be used to treat non-traditional water sources, which could then be used in power plants.

Four kinds of non-traditional water sources were treated during the researchers' tests: ash basin water, simulated cooling water, flue gas desulphurisation water and produced water, or water that is extracted from the ground along with oil and natural gas.

All of the water sources contained contaminants such as salts, heavy metals and hydrocarbons. In addition, all were capable of causing bio-fouling or corrosion because of their pH, ionic strength or nutrient content.

Recognising the differences in each water source, unique wetland treatment systems were designed and constructed for each type of water.

The artificial wetlands were created in large (70 to 250-gallon) vats containing vegetation that would be found in natural wetlands, such as California bulrush and narrow-leaf cattail. Each type of water was gravity fed through its own series of vats, residing for about 24 hours in each.