The development history of the volute sludge dewatering machine

- Nov 01, 2017-

Filter equipment first appeared in the 19th century in the period of the industrial revolution in Europe. The first industrial filter equipment has filter press, leaf filter, screw filter and so on.


The screw filter, also called screw extruding-desiccation machine, first appeared in Germany in the sixties of the 20th century, and then the former Soviet union, Sweden, United States and other countries also successively made the filter. Its earliest application is in the crushing dehydration, fish and shrimp waste filtration after the grinding of oil and fish. In recent years it has been widely used in sludge dewatering and other industrial processes dehydration.


In the early stage, the screw filter was used to filter the waste such as fish, shrimp and other wastes. When the filter started, the material was squeezed and the filtrate was filtered out of the filter. But after filtering for a period of time, the filtrate stopped flowing, and the filter cake will not be discharged from the discharge port. The main reason is the increase of the material concentration. The filter efficiency is reduced due to the filter structure, and the clogging occurs.


With the development of screw filtration technology, in order to avoid the problem of clogging, in the 1970s in Germany and other European countries, a relatively new filter structure, such as the grid structure and dynamic ring filter structure appeared. The movable fixed ring structure filter is set on the spiral shaft sleeve full of multiple rings. The ring is divided into two types: fixed ring and movable ring. The gap between fixed ring and movable ring has a certain filtering gap. Through the friction between movable ring and fixed interlocking material, the effect of material extrusion is greater than that of blocking friction, so as to improve the effect of material filtration and separation, and avoid the plugging phenomenon of high viscosity material.


For example, the volute sludge dewatering machine, which is produced by Darmstadt University of Technology and FAN Company in Germany and LYCO Company in America, has been introduced in the field of fishery, farm and so on.It can avoid the problem caused by plugging, and it is spread in Japan, Korea and many other countries whose fishery and food industry are developed.


In recent years, the volute sludge dewatering machine has been developed, innovated and extended in our country. Because of the easy separation and non-clogging, the volute sludge dewatering machine has been widely used in municipal wastewater treatment and industrial wastewater treatment, petrochemical, pharmaceutical, textile, metallurgy, food and beverage, mining and other fields.


With the development of new materials and control technology, some domestic companies have made some innovations and improvements on the original basis, such as the improvement of spiral shaft, no wear structure, industry-specialized type, and so on.



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