The treatment of the municipal sewage and industrial waste water has become the top problem for different regions and enterprises. Although the treatment process technology of the sewage has been mature and perfect, the key link of the sludge concentration and dewatering is still in continuous research and exploration. Our factory has developed the dewatering equipment of new generation by studying the working principle and structure of various kinds of dehydrators and absorbing the mature technology and experience from the foreign countries since this year. The dewatering equipment has replaced the imperfect plate and frame press filter and the centrifugal thickener, being widely used in the sludge concentration during the sludge treatment process and the concentrated pressure filtration of the slurry during the production process and it is the concentrated equipment for the first choice.

Since the liquid sludge owns high fluidity, large amount of water in free state and does not have the pressure-resistance capacity, it comes to the gravity dewatering area first to remove the water in free state, reduce the fluidity of the sludge and produce relatively large binding force between the flocculant and the particles. Then the wedge preloading dewatering period is entered and after the tiny micro-pressure dewatering, the fluidity is nearly lost on an overall basis to make preparation for the cyclotron dewatering and shear dewatering. The sludge, after undergoing the gravity dewatering area and wedge dewatering area, will basically eliminate the moisture in the water in free state and within the flocculant. When the sludge in the weld network enters the roller with relatively small diameter, the pressing force produced by the tension force of the filter belt and the dewatering cake will be squeezed between the upper and lower filter belt, and produce shear force according to the different rotation directions to carry out dewatering treatment.