BIOLOGICAL SYSTEMS WITH PERCOLATOR FILTER

This typology of system is a good solution for the treatment of civil or industrial waters where it is not possible to install an active sludge system.
The biological degradation of the organic matter is the result of the action of microorganisms that are attached to plastic filling bodies spread in a properly sized chamber.

The phases are the same as the ones for an active sludge system. It differs only because the biomass is not suspended but compact.

	PRIMARY DECANTATION. It takes place in an Imhoff tank in order to hold floating materials and likely sedimentable bodies to obtain a particularly clarified effluent reducing the polluting load of approximately 30%. The soapy waters are pre-treated in a grease condensing tank.
	BIOLOGICAL OXIDATION OF COMPACT BIOMASS. The sewage is distributed through small pipes with holes on the BIOFILL plastic filling bodies to which the microorganisms are attached and degradate the organic matter. In this phase the destruction of the polluting load can reach 90% and it is closely correlated to the applied amount and to the retention time.
	FINAL DECANTATION. The matter made up of water and sludge is pumped in the hopper-shaped decantation chamber where the sludge settles to the bottom of the tank and the purified water flows out into the sample taking pit and then discharged to the receiving body. The settled sludge is then taken and put into circulation again at the head of the perculator.

The treatment of industrial sewage involves specific pre-treatments.
According to the users’ individual needs monobloc percolators are made with a percolation and decantation chamber in only one tank divided by a separating wall or standard plants with two separate phases in two distinct products.