Sludge freeze-thawing cycle conditioning and deep dewatering method

Abstract

The invention discloses a sludge freeze-thawing cycle conditioning and deep dewatering method, relates to the technical field of sludge treatment, and aims to solve the problems that a sludge treatment method on the market is low in dewatering performance and low in sludge dewatering amount, the number of treatment devices is large, the treatment devices are dispersive, the process is complex, anduse cost is high. The method comprises the following steps: (1) taking residual sludge of a sludge bin of a sewage treatment plant, wherein the moisture content of the sludge is 70-80%; (2) carryingout quick freeze-thawing treatment: concretely putting the sludge into a W-shaped material frame, soaking the material frame in a refrigerating fluid through an electric hoist, completely freezing thematerial frame, then conveying the material frame to a thawing tank through the electric hoist for demolding treatment, and carrying out discharging after demolding is completed, wherein the freezingtemperature ranges from -25 DEG C to -35 DEG C, the freezing time is 1-1.5 hours, the unfreezing temperature is about 35-45 DEG C, and the thawing time is 15-30 minutes; and (3) after the sludge is thawed, conveying the sludge to a deep dewatering integrated device. Firstly, the pressure in a filter pressing stage is 0.8-1.6 MPa, the filter pressing time is 15 min, the squeezing pressure in a squeezing and dewatering stage is 1.8 MPa, the squeezing time is 10 min, and a mud cake with a water content of about 40% is obtained after deep dewatering is carried out through a plate-and-frame filterpress.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge freeze-thaw and deep dehydration method, Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, more and more sewage is produced every day, and the corresponding sludge output of sewage treatment plants is also increasing. However, the sludge used in sewage treatment plants in my country Most of the treatment processes or methods can only reduce the moisture content of sludge in sewage treatment plants to about 80%, which is high in moisture content and large in volume, and is not conducive to the later utilization of resources. [0003] At present, the domestic mainstream sludge disposal processes include landfill, incineration, and digestion. No matter which disposal method is adopted, sludge dehydration is one of the key steps to effectively reduce the volume of sludge. It is of great significanc...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for sludge freeze-thaw cycle conditioning and deep dehydration, to solve the problem of low dehydration performance and low sludge dewatering capacity of the current sludge treatment methods on the market proposed in the above background technology, and the treatment device is relatively low. Many and scattered, complex process, high cost of use

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