Method for deeply dehydrating sludge

A deep dehydration and sludge technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems that do not meet the requirements of deep dehydration of sludge, and achieve the effect of strong hydrophilic effect

Inactive Publication Date: 2010-10-20
JIANGSU JINSHAN SOLID WASTE RESOURCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in domestic sludge dewatering, the polymer flocculant polyacrylamide (3‰DS) is generally used to dewater by belt filter or centrifuge, but the water content of the sludge after dehydration is still as high as 80%.
This conventional method is no longer suitable for the current deep dewatering requirements of sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Take the remaining sludge in the secondary settling tank with a water content of 99.7%, add No.1 conditioning coagulant, that is, contain polymer flocculant, the addition amount is 0.05%, and fully stir for 3 minutes;

[0026] 2. Add No.2 conditioning coagulant, which contains Fe 3+ Chemical raw materials, the addition amount is 0.6%, fully stirred for 5 minutes;

[0027] 3. Inject the adjusted sludge into the plate-and-frame filter press through a pneumatic diaphragm pump. The sludge inlet pressure is 0.6MPa. After 60 minutes, keep the pressure at 1.6MPa for 30 minutes to remove the moisture in the sludge;

[0028] 4. After the pressure holding is completed, release the pressure and discharge the material.

[0029] After dehydration, the water content of the sludge reaches 62.2%, which meets the treatment requirements.

Embodiment 2

[0031] 1. Take the sludge from the digestion and concentration tank with a water content of 91.7%, add No.1 conditioning coagulant, which contains polymer flocculant, the addition amount is 0.05%, and fully stir for 3 minutes;

[0032] 2. Add No.3 conditioning coagulant, which contains Fe 3+ Chemical raw materials, the addition amount is 0.6%, fully stirred for 3 minutes;

[0033] 3. Add No.4 conditioning coagulant, which contains Ca 2+ Chemical raw materials, the addition amount is 2%, fully stirred for 3 minutes;

[0034] 4. Inject the adjusted sludge into the plate-and-frame filter press through a pneumatic diaphragm pump. The sludge inlet pressure is 0.6MPa. After 60 minutes, keep the pressure at 1.6MPa for 30 minutes to remove the moisture in the sludge;

[0035] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0036] After dehydration, the moisture content of the sludge reaches 61.6%, which meets the treatment requirements...

Embodiment 3

[0038] 1. Take the sludge from the primary settling tank with a water content of 93.3%, add No.1 conditioning coagulant, which contains polymer flocculant, the addition amount is 0.05%, and fully stir for 3 minutes;

[0039] 2. Add No.3 conditioning coagulant, which contains Fe 3+ Chemical raw materials, the addition amount is 1.2%, fully stirred for 3 minutes;

[0040] 3. Add No.4 conditioning coagulant, which contains Ca 2+ Chemical raw materials, the addition amount is 4%, fully stirred for 3 minutes;

[0041] 4. Inject the adjusted sludge into the plate-and-frame filter press through a pneumatic diaphragm pump. The sludge inlet pressure is 0.6MPa. After 60 minutes, keep the pressure at 1.6MPa for 30 minutes to remove the moisture in the sludge;

[0042] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0043] After dehydration, the moisture content of the sludge reaches 62.9%, which meets the treatment requirements.

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Abstract

The invention relates to a method for deeply dehydrating sludge, which comprises the following two steps of: 1, tempering, namely adding a polymeric flocculant into sludge slurry, stirring for 0.5 to 20 minutes, adding a chemical raw material containing Fe<3+> to perform reaction for 0.5 to 20 minutes with stirring, and adding a chemical raw material containing Ca<2+> to perform reaction for 0.5 to 20 minutes with stirring; and 2, dehydrating, namely introducing the tempered sludge into a filter press to filter off moisture in the sludge, keeping the sludge under the pressure of between 0.1 and 2.5MPa for 15 to 120 minutes, and keeping the sludge under the pressure of between 1.0 and 3.5MPa for 15 to 120 minutes. The method has the advantages of small additive amount of medicament, low cost, simple process and high dehydrating efficiency by combining chemistry and machinery. The moisture content of the dehydrated sludge is reduced to below 65 percent and the combustion calorific value of dry sludge is reduced to less than 10 percent. The dehydrated sludge cake is very suitable for drying and incinerating the sludge and provides beneficial conditions for subsequent treatment and comprehensive utilization.

Description

technical field [0001] The invention relates to a method for deep dehydration of sludge, in particular to a method composed of polymer flocculant and Fe-containing 3+ Chemical raw materials, containing Ca 2+ A deep dehydration method for sludge with a tempered coagulant composed of an inorganic coagulant of chemical raw materials. It belongs to the field of sludge treatment. Background technique [0002] Sewage plant sludge is difficult to dispose of and has become an extremely fragile link, which is highly concerned and valued by the society. Sludge incineration technology can best achieve volume reduction, stabilization, and harmless treatment purposes, so it has become the first choice for sludge treatment technology in urban areas with land shortages. The high-efficiency and low-cost chemical preparation sludge dewatering technology can greatly reduce the overall cost of sludge treatment, so it is the key to sludge treatment and plays an extremely important role in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 黄瑛赵培涛袁凌飞
Owner JIANGSU JINSHAN SOLID WASTE RESOURCE TECH
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