Superposition-screw type sludge deep dehydrator

Abstract

The invention discloses a superposition-screw type sludge deep dehydrator and a dehydration method which belong to the technical field of sludge deep dehydration. The dehydrator is structured as follows: variable-diameter rotating and fixed rings are fixed on an equipment housing through a fixing bolt and a dead plate; an end of a screw shaft is provided with a groove which fits with a cylindrical boss inbuilt at one end of the equipment housing; the screw shaft is connected with a reducing motor arranged at the other end and then the screw shaft and the reducing motor are together fixed on an equipment support; a feed inlet is disposed at the front end of the screw shaft; a discharge port is arranged at the rear end of the screw shaft; a pressure plate is connected with the variable-diameter rotating and fixed rings; a backpressure plate is disposed at the rear end of the screw shaft; and a liquid collecting tank and a drain outlet are arranged on the equipment support. The whole technological process is operated in cold state, requires no heat source, has a removal effect of ascaris eggs in sludge and fecal coliform, and has a stabilization effect of heavy metal. The system machine is easy to operate and convenient to maintain.

Description

technical field [0001] The invention belongs to the technical field of deep sludge dewatering, and in particular relates to a screw stacking deep sludge dewatering machine and a dewatering method thereof. Background technique [0002] The sludge dewatering process is mainly mechanical dehydration, mainly including: vacuum suction filtration, centrifugation and pressure filtration. The main machinery and equipment are: rotary drum vacuum filter, rotary barrel centrifuge, plate and frame filter press, belt filter press dehydration, screw press dehydration, etc. This type of dehydration machine removes only the free interstitial water in the sludge. Although the dehydration is performed, the sludge moisture is still about 75% to 85%. [0003] Thermal dehydration generally uses steam, flue gas or other heat sources, it is not drying in the general sense. The commonly used equipment is paddle machine, sleeve machine or fluidized bed, etc., and the thermal efficiency is also imp...

AI Technical Summary

Problems solved by technology

This kind of equipment still needs to rely on a heat source, and the structure of this special screw press is complicated and expensive, and the cost of replacing parts is very high. At the same time, its production efficiency is low

[0006] There is also a dehydration technology using a membrane filter press. The principle of this technology is that the wet sludge with

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