Wastewater contains energy that can be harnessed and utilized
Wastewater contains energy in the form of potential energy, thermal energy and chemically bound energy, all of which can be harnessed and utilized. In the USA, there are 104 wastewater treatment plants using biogas to produce a total of 190 MW capacity. Wastewater is increasingly recognized as potential source of energy: in several countries, water supply companies are working towards becoming energy-neutral. It is estimated that more than 80% of used water worldwide -and up to 90% in developing countries- is neither collected nor treated, threatening human and environmental health.