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Sludge dewatering method adopting low-pressure hot air segmentation type filter pressing and purging

A technology of sludge dehydration and hot air, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of high energy consumption, limited dehydration effect, high auxiliary cost of conditioner, etc. Low cost, reduced production cost, and easy recycling

Pending Publication Date: 2022-07-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing sludge dehydration method, which require high pressure, high energy consumption, limited dehydration effect and high auxiliary cost of conditioner, and provide a fast and efficient method under lower pressure conditions. Sludge dewatering method with hot air split filter press and purging

Method used

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  • Sludge dewatering method adopting low-pressure hot air segmentation type filter pressing and purging
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  • Sludge dewatering method adopting low-pressure hot air segmentation type filter pressing and purging

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Effect test

Embodiment 1

[0028] Embodiment 1 A kind of sludge dewatering method of low pressure hot air split type filter press purging

[0029] The sludge dewatering method of the low-pressure hot air split type filter press purging comprises the following steps (see the schematic diagram for the process flow). figure 1 ):

[0030] S1. Place a wire mesh with a diameter of 7 mm, a number of holes of 75, and a wire meridian of 1.25 mm on the filter cloth, and pour 100g of uniformly stirred sludge into the filter press;

[0031] S2. Turn on the air compressor, adjust the valve, keep the air pressure in the filter press at 0.6MPa, and start filtering the sludge;

[0032] S3. When the pressure in the filter press drops rapidly, it means that there are many cracks formed on the sludge filter cake (see the schematic diagram of sludge dewatering). figure 2 ), turn on the air heating device at this time, set the temperature to 35 ° C, close all devices after 60 min, and take out the mud cake (see the schem...

Embodiment 2

[0035] Embodiment 2 A kind of sludge dewatering method of low pressure hot air split type filter press purging

[0036] The sludge dewatering method of the low-pressure hot air split type filter press purging comprises the following steps:

[0037] S1. Place a wire mesh with a pore diameter of 4 mm, a number of holes of 225, and a wire meridian thickness of 0.8 mm on the filter cloth, and pour 100 g of uniformly stirred sludge into the filter press;

[0038] S2. Turn on the air compressor, adjust the valve, keep the air pressure in the filter press at 0.6MPa, and start filtering the sludge;

[0039] S3. When the pressure in the filter press drops rapidly, it means that there are many cracks formed on the sludge filter cake. At this time, turn on the air heating device, set the temperature to 35 °C, close all devices after 60 minutes, and take out the mud cake.

[0040] Refer to Example 1 for the evaluation of the effect of the sludge dewatering method.

[0041] In this examp...

Embodiment 3

[0042] Embodiment 3 A kind of sludge dewatering method of low pressure hot air split type filter press purging

[0043] The sludge dewatering method of the low-pressure hot air split type filter press purging comprises the following steps:

[0044] S1. Place a wire mesh with a diameter of 6 mm, a number of holes of 100, and a wire meridian of 1.25 mm on the filter cloth, and pour 100 g of uniformly stirred sludge into the filter press;

[0045] S2. Open the air compressor and adjust the valve to keep the air pressure in the filter press at 0.8MPa, and start filtering the sludge;

[0046] S3. When the pressure in the filter press drops rapidly, it means that there are many cracks formed on the sludge filter cake. At this time, turn on the air heating device, set the temperature to 35 °C, close all devices after 60 minutes, and take out the mud cake.

[0047] Refer to Example 1 for the evaluation of the effect of the sludge dewatering method.

[0048] In this example, T 0 It ...

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Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a sludge dewatering method adopting low-pressure hot air segmentation type filter pressing and purging. According to the method, an air filter pressing technology and a framework net are combined, the framework net with good rigidity is added to filter cloth, when air filter pressing acts on sludge, the framework net cuts and splits the sludge and can assist the sludge to generate a large number of cracks, at the moment, the pressure intensity is reduced, air is heated and then is continuously filtered through hot air, and the air filter pressing effect is achieved. Hot air can quickly purge the inside of a sludge filter cake, so that the sludge is quickly dehydrated, and a remarkable dehydration effect can be achieved without adding a conditioner, a flocculating agent and the like; moreover, the framework net is low in manufacturing cost and very convenient to recycle, so that the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment. More specifically, it relates to a sludge dewatering method of low pressure hot air split filter press purging. Background technique [0002] The treatment and disposal of sludge in the urban sewage treatment plant follows the principles of "reduction", "stabilization", "harmlessness" and "resource utilization". Therefore, at present, the reuse methods for sludge treatment mainly include agricultural use, brick making, land improvement, mixed landfill, landscaping, etc., and various disposal schemes have their corresponding national standards. The moisture content in sludge generally accounts for more than 95% of the weight of the sludge. In order to achieve the "stabilization", "harmlessization" and "resource utilization" of the sludge, the "reduction" of the sludge must first be realized. ”, that is, the sludge must be dewatered first. [0003] Mechanical dewatering is currently the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121C02F11/13
CPCC02F11/121C02F11/13
Inventor 田双红匡思远熊亚
Owner SUN YAT SEN UNIV
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