OUTLINES OF THE PROCESS

The flocculation must occur in a moderate and not turbulent way. This will help the sludge flocs creation and ageing and, at the same time, prevent their settling on the tank bottom.

OPERATION DESCRIPTION

In the Accelator the suspension is recycled from the sludge-bed chamber to the reaction chamber.
The reagents are added directly into the suspension of the precipitated sludge so that the reaction makes the suspended particles size grow rather than produce a precipitation of new particles.
Then the suspension goes to a secondary reaction zone and subsequently to the concentration zone, from where it can return to the primary reaction chamber.

In the Accelator:
• the primary reaction chamber is inside the cone
• the secondary reaction chamber is downstream the turbine

The rotary stirrer blades angle produces the circulation.

The sludge drainage is achieved by closing the sluice gates which do not allow the sludge to return to the reaction zone from the concentration zone. The sludge sediments on the bottom of the hopper; the concentrated sludge is drained by gravity by opening the drain valves.

The clarified water is collected in the upper part through radial ditches.
The Accelator is not equipped with bottom scrapers. In some cases only, for equipments of more than 25 m., it could be necessary to install some bottom scrapers to convey the sludge into the hopper.

TECHNICAL DATA