Wastewater of domestic or industrial origin requires rigorous treatment before returning to the environment. This treatment is carried out in specific facilities made up of different processes, selected according to the characteristics of the water to be treated and its final destination.
We define Regenerated Water as that which comes from wastewater treatment plants and which, once treated, is applied an additional treatment to make it suitable for a new use, with the quality required by the new application.
The separate fractions in the decanters (primary and secondary) of the treatment plants are called sewage sludge or sludge. These are liquid, with very low concentrations of dry matter. An important part of the dry matter of sludge is organic matter.