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What is the difference between the belt sludge dewatering machine and the centrifugal dewatering machine, the double screw dewatering machine?

Belt filter press structure is simple, wearing parts is a filter cloth, an average replacement once a year. Low power consumption. To 2m with machine as an example; host 1.5kw, conveyor screw pump; 7.5kw, washing pump water consumption 20m3 / hour, head 60m, power distribution cabinet is simple. Polyacrylamide consumption; handling 1 ton of dry mud 3 kg.
A total investment of about (including the above ancillary equipment) 400,000 yuan, power consumption less than 20kw. Sludge moisture content 80%
 
Centrifugal dehydration machine, complex structure, maintenance trouble, the main bearing update cost (SKF) high power consumption 75kw, also need sludge cutting machine. Other ancillary equipment and the same machine. Distribution cabinet complex, and PLC linkage operation. A set of imported equipment to 1.6 million, made 100 million, and the spiral conveyor blade wear and tear, the annual replacement. High maintenance costs. Sludge moisture content of 75%.
 
Dip-type dehydration machine structure is simple, static and dynamic discs easy to wear, the price is also a lot of money, available in small desquamation. A large-scale jet loops can not be compared. The above equipment refers to the same amount of treatment per hour (moisture content of 75% to 80%) of about 2 tons.

How does the filter press work?
What is the purpose of the vacuum pump? Which industry is applicable?