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Origin and Development of Stacked Screw Sludge Dewatering Machine

Filtration equipment first appeared in the 19th century during the European industrial revolution, the earliest advent of industrial filtration equipment are filter press, leaf filter and spiral filter.

Spiral filter, also known as spiral extrusion dewatering machine, first appeared in Germany in the 1960 s, and then the former Soviet Union, Sweden, the United States and other countries have also made this kind of filter, and the first application in the oil and fish grinding after the minced meat squeezing dehydration, fish, shrimp waste filtration, in recent years is in the sludge dehydration and other industrial process dehydration and other fields have been widely used.

In the early days, the spiral filter found such a situation when filtering fish, shrimp and other wastes. At the beginning of the filtration, the feed was squeezed and the filtrate flowed out of the filter screen. However, after filtering for a period of time, the filtrate will stop flowing, and the filter cake will not be discharged from the discharge port. The main reason is that the concentration of the material increases, and the filtration efficiency decreases due to the filter structure.

With the development of spiral filtration technology, in order to avoid the problem of clogging, a relatively new type of filter structure appeared in Germany and other European countries in the 1970 s, such as grid filter structure, dynamic ring filter structure, etc. Among them, the filter screen of the movable ring structure is to cover the spiral shaft with multiple ring pieces, and the ring pieces are divided into two types: fixed ring pieces and movable ring pieces. The fixed ring and the movable ring are spaced apart from each other and have a certain filter gap. Through the friction of the material between the movable ring and the fixed ring ring, the friction force that promotes the extrusion of the material is greater than the hindering effect, thereby improving the filtration and separation effect of the material and avoiding The blockage of high-viscosity materials.

For example, Darmstadt University of Technology in Germany, FAN Company and LYCO Company in the United States, which are suitable for fishery, farm and other fields, and the spiral filter equipment with dynamic and fixed ring filter structure, the prototype of the stacked screw sludge dehydrator, has been introduced, which can well avoid the problems caused by blockage, and therefore has been popularized in Japan, South Korea and other countries with developed fishery and food industries.

In recent years, the stacked screw sludge dewatering machine has also been developed, innovated and promoted in China. Due to the characteristics of easy separation and no blockage, it has been widely used in municipal sewage treatment and industrial wastewater treatment, petrochemical, pharmaceutical, textile, metallurgy, food and beverage, mining and many other fields.

With the development of various new materials and control technology, some domestic companies have also made some innovations and improvements on the basis of, such as the improvement of screw shaft, wear-free structure, industry-specific models, etc.

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Origin and Development of Stacked Screw Sludge Dewatering Machine

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2023-12-21