High performance through proven methods

Solid- / liquid separation

A complete pressing cycle consists of a filling phase and a pressing phase. A complete cycle takes 70 – 120 minutes depending on the drainage characteristics of the sludge. The cycle follows an automatic emptying.

1) The press space is filled up using a pump.

2) The press piston is moved forward reducing the press space volume forcing the liquid through the drainage elements into the filtrate collection chamber at the end of the cylinder.

3) The press piston is pulled back. The slow rotation of the cylinder and movement of the drainage elements allows the filter cake to fragment into pieces. The vacuum created in the cylinder causes a back flow through the filter sleeves thus cleaning them. During the next pressing phase the filter cake pieces effectively assist in the filtering. The process steps 1, 2 and 3 are repeated until a sufficient quantity of filter cake has developed in the press space. The actual pressing phase follows by alternating process steps 2 and 3 until the desired degree of dewatering is achieved. The high degree of dewatering is due to the short flow path of the liquid to the filter elements that is developed through the frequent pressing and loosening.

4) When pressing is complete the press space casing is hydraulically opened and the fragmented filter cake discharged by the press piston.


Washing In Place (WIP) units

WIP - Washing In Place -is a process to reliably and safely clean production lines. Bucher Unipektin has been manufacturing WIP units of various types for years. The scope of supply comprises of simple manual units as well as fully automated units with several batch tanks. The cleaning solution will be conditioned in the batch tanks until the desired temperature and concentration has been reached. Various receipts are stored in the control system and allow unit-related cleaning sequences either in parallel or one after another. Usually a cleaning program consists of the cleaning steps pre-rinse water, caustic solution, final rinse water and optional acid or sanitizer. In order to achieve an ideal cleaning result the following values will be observed and kept on a pre-defined target value: concentration, temperature and flow rate. The cleaning solutions will be re-used as appropriate and re-circulated via the batch tanks. Operating costs are saved and pollution of nature is reduced.