Sewage and wastewater treatment
the use of water in both civil and industrial fields leads to the production of waste water. waste water cannot be returned to the environment as such as the final contact details such as the land, the sea, the rivers and the lakes are not able to receive a quantity of pollutants higher than their self-purification capacity
the treatment of sewage of municipal sewage consists in a succession of several phases (or processes) during which, from the wastewater are removed the unwanted substances, which are concentrated in the form of sludge, giving rise to a final effluent of quality to be compatible with the self-depurative capacity of the receiver body (soil, lake, river or sea by submarine or shoreline conduct) chosen for the spill.
the purification, as a combination of several processes of chemical, physical and biological nature, is the only way to safeguard the ecosystem.