The waste waters are collected from the sewage networks and conveyed through collectors to the treatment plant.
Grilling is used to remove large solid material (pieces of plastic, wood, hygiene products, stones, paper etc.): anything that could otherwise clog pipes and pumps. It act in two steps in sequence: a first larger the second thinner. The collected grating material is washed, pressed and taken to landfill or to a BIOZIMMI plant.
In the grit removal tank the sands are separated using natural sedimentation. This is due because the grain size of the precipitated sands is such as not to give rise to suspensions.
In the EMPOWERING DEVICE all the eventually present hydrocarbons are captured, therefore begin a strong oxidation of the organic components present in the fluid occurs and the suspended particles (the sludge) are reduced to infinitesimal dimensions breaking the physical bonds with the water and thus promoting a subsequent rapid sedimentation. The fluid is also deprived of the incoming bacterial load and strongly enriched with oxygen.
In the post cavitation sedimentation / settling tank both the gravity separation of the sedimentable solids takes place (the residual sludge of the chemical / biological reactions are made more separable thanks to cavitation so they accumulate on the bed of the tank and can be pushed away by the bottom blade of the crane into the collection hoppers for subsequent treatments) and the metabolic action of specially introduced microorganisms that feed with the organic substances previously totally released and the oxygen dissolved in the sewage.
Therefore, flakes are formed consisting of colonies of bacteria that tend to decant easily, thus making the muddy mass easily eliminated. Further oxygen is supplied by blowing air from the bottom.
If needed, bacteria suitable for eliminating excess nitrogen could also placed inside the tank. In addition to the merging of the sedimentation / settling steps with the microorganisms treatment, the residence time is drastically reduced, thanks to the previous cavitation cycle.
Through an overflow system, as quickly as it is treated, the water is conveyed to a second EMPOWERING DEVICE where it is sanitised, eventually flocculated if it is required a greater clarification and, if needed, made drinkable. Alternatively, after the second cavitation passage, the water is purified and can therefore be introduced into a surface watercourse.
The sludge is passed through the EMPOWERING DEVICE to remove its bacterial load and in order to sanitise it.
Then, by means of a belt press, it is mechanically dehydrated and concentrated. At this point, free of excess nitrates, rich in carbon and dry, it can be used as quality compost for agriculture purpose or as a basis for producing biogas by biodigestion and therefore used as normal compost or, more simply, eliminated through a gasification process, self-sustainible.
