Mechanical press

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Bucher presses are the only mechanical devices on the market that enable the dewatering of sewage sludge the limit of their physical dehydrability and therefore belong to the group of the most effective dewatering devices. In practice, a higher level of sewage sludge dewatering is only possible with prior application of sludge disintegration or hydrolysis. The example of many implementations confirmed by references shows that the technical service life of Bucher piston presses is over forty years. The manufacturer of the presses is the company Bucher Unipektin AG from Switzerland, and Proffico is their exclusive distributor in Poland for the municipal and industrial sectors. The first investments in Poland in the field of sewage sludge dewatering using Bucher piston presses were installations in Radom and Puławy, and currently piston presses are also operating in Rzeszów, Lubartów and Józefów. Principle of operation of piston presses The main element of the press is a cylinder and piston. Between the piston and the cylinder, special drains are placed, which discharge the filtrate to the sewage system. The mixture of sediments with flocculant is fed to the cylinder using a screw pump, filling the free space between the drains. The size of the cylinder and the number of drains (including the filtration surface) determine the efficiency of the press. The operating principle is identical to that of piston engines, where cyclic compression and expansion phases occur, with the difference that the piston with the cylinder additionally rotates around its own axis at a speed of approx. 6 revolutions per minute and the empty space in the cylinder is filled with sediments.