Belt filter press is the introduction of technology from the United States, the digestion and absorption, the successful development of a water treatment device, a large number of continuous filter press sludge, products using high-strength materials, with a processing capacity, dehydration, high efficiency, long life and other characteristics, widely used in solid-liquid separation in various industries, the configuration of the bearing and long service life, while using high-quality filter with fully ensure the performance and quality of the filter press. First, the working principle of the belt filter press is divided into three steps filtration and dewatering functions: 1, gravity dewatering zone wastewater treatment plant sludge is pumped into a stirred tank sludge and a coagulant polymer (polymer) mixed After the role of the fine sludge particles in suspension by bridging coagulant to form the latex polymer (floc) form larger particles, then gravity flow mode from the upper end of the stirring tank overflow into subsequent dewatering operations. 2, the pressure by the gravity dewatering sludge dewatering zone area into the pressure dewatering zone, up and down the cloth began to squeeze sludge dewatering. 3, with the cloth pressed sludge dewatering zone moves into the pressurized dewatering zone, in six is ??vertical roller room, according to the diameter of the large wheel and gradually smaller, the pressure increases by a small configuration, with the upper and lower filter cloth wheel due to conversion between different vertical position while the sludge produced by shear force, the glue feather mud capillary bound water (capillary water) squeezed out, to produce a relatively dry sludge cake. Second, the advantages 1, automatic control, continuous. 2, low energy consumption, long service life. 3, dehydration, high efficiency, cake solid rate. 4, easy to manage, easy maintenance. 5, low noise, less chemicals. 6, economic, reliable, and wide application. Third, performance scientific design and rational layout, make sure the filter press dewatering with high performance, the main dewatering roll is to use a hole design, not only to increase the processing capability, and the sludge can be dewatered at the same time on both sides, both sides of the filter belt filter press dewatering process quickly, shortening the drying time, the smaller roll back changes in the arrangement and the contact angle of the belts to ensure the best combination of pressure and shear forces, thus greatly improving the cake solid rate and dewatering efficiency. Fourth, the characteristics of the filter belt tension is achieved by a pneumatic cylinder, so that the entire filter belt tension remains constant, but will not change the feed amount caused by changes in tension, easy to operate and manage, filter with automatic detection filter with the position of the pressure roller and automatic correction of pneumatic control systems, for a wide band filter also has automatic filter press sludge feeding device to ensure balanced access to the sludge filter belt, thereby improving filtration efficiency and prolonging filter belt life. Fifth, the structure has two belt filter press filter belt, before the normal pressure dewatering zone and a longer gravity dewatering zone, this unique structure not only improves the efficiency of dehydration, reduce the chemicals, but also greatly reduces energy consumption.