It is a unit in which water entrance to the treatment system, coagulation, floatation and sedimentation sections exist. Polymer is added to the unit’s entrance for coagulation and floatation formation. There is a lamella module in the unit for surface preparation and ensuring rapid flock settlement. Some of the flocks are fed to the unit entrance through a pump to use the polymer inside the flocks. The rest of the sludge is removed from the system.

A high-density polymer floats in this unit. It is ensured that the flocks floating in water are caught when they pass through the polymer with the help of a coagulant matter during water passage fed from the bottom with pump pressure. Reverse washing is applied with air and pressure water to solve the accumulated flock layer. The reverse washing process is applied depending on time and pressure in the unit.

The multi-layer sand bed is composed of anthracite coal and garnet. Water sluiced from upside into the unit is kept at a certain level. Water passes through the bed material at a constant speed to be directed to the exit by the nozzle plate. To remove solid materials deposited on the filter bed, reverse washing is applied with air and pressure water. Reverse washing process is applied depending on time, water level and effluent’s turbidity.

NOTE: The sedimentation unit with chemical lamella is not included in the sizes.