Circular press dewatering method

Abstract

The invention discloses a circulating compression dehydration method applied to the dewatering treatment of rarefied sludge. The dehydration method dehydrates partial dehydrating materials by means ofcirculating compression and utilizes the dehydrated materials to adjust the water content of materials without dehydration and improve the dehydration environment, an unloader knife with a dentate gap is arranged beside an upper filtering belt at the discharging part of a compression dehydration area, the gap face of the unloader knife contacts with the upper filtering belt, when the upper filtering belt and a lower filtering belt wrapped with dehydrating materials are rotated to the discharging part of the compression dehydration area under the driving of a driving unit of a compression dehydration device, partial dehydrating materials under the upper filtering belt are scraped away through the unloader knife with the dentate gap, and a concave-convex material layer stayed on the surfaceof the upper filtering belt enters into the next compression dehydration following the circulation of the upper filtering belt. The dehydration method overcomes the defects of the prior art without changing the properties of materials themselves, and adjusts the water content and improves the dehydration environment of the materials through the circulating compression dehydration of partial materials, thereby effectively reducing the sludge flow and increasing the material dehydration dryness and output.

Description

technical field [0001] The invention relates to a solid-liquid separation method, in particular to a circulating press dehydration method suitable for dehydration treatment of thin sludge. Background technique [0002] The pressing dehydration method in the prior art is to carry out mechanical pressing and dehydration in the pressing dehydration area of ​​the pressing dehydration equipment, and the dehydrated materials wrapped in the upper and lower filter belts wrapped outside the press roll in the press dehydration area are subjected to pressure by the press roll and filter belt. Pressed and dehydrated. Chinese patent application 200710068654.8 "A Solid-Liquid Separation Method and Equipment" discloses a continuous belt press dehydration method using independent filter belts for two or more stages of pressing pressure from low to high. Adopting the method of dehydration by graded pressing, the solid-liquid separation efficiency is high, and the solid content of the final ...

AI Technical Summary

Problems solved by technology

However, this method adopts high-pressure press dehydration method. When it is used to process materials with high moisture content and thin texture, the phenomenon of mud running from the materials to both sides of the filter belt during the pressing process is serious, which reduces the amount of materials entering the press dehydration zone. Lead to a decrease in dehydration treatment output and affect dehydration efficiency

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