Belt Filter Press (L Series)

The Belt Filter Press (BFP-L) is an industrial machine, used for solid/liquid separation processes, particularly the dewatering of sludge in various industries. 

Brought to India with the help of a technical collaboration between Krofta Engineering Limited and AJV Engineering Ky. in 2007, it is a continuously operating double belt dewatering machine. The presses are designed for dewatering different kind of sludge by means of progressive compression between two permeable belts. Liquid sludge is conditioned by adding polymer to obtain the separation between liquid and solids. This operation is performed in an in-built flocculator tank with an agitator. Sludge flows from the flocculator to the distributor of the machine, where the sludge flows as an even mat to the gravity zone and then passes the low-pressure zone (also called “wedge” zone) before entering the high-pressure zone (also called “S” zone).In the gravity zone, sludge drains the greatest part of free water. The belt is supported by series of bars, which improve the drainage by producing discontinuity and breaking the water surface tension. In the wedge zone, upper and lower belts gradually and slightly increase specific pressure applied to the sludge. The perforated rollers increase the pressure applied to the sludge.

In the high-pressure zone two belts form “S” configuration rounding these rollers. In this way the pressure directed to the sludge gradually increases and removes as much water as possible. Dewatered cake is finally discharged from the belt by two doctor blades. The belts are continuously cleaned under the washing manifold which has spraying nozzles.