Sludge deep dehydration method

A deep dewatering and sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, can solve the problems of incompatibility with sewage treatment, increasing filtration specific resistance, and unsatisfactory effect.

Active Publication Date: 2007-05-16
广州优特利环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Interstitial water is easy to remove in theory, but because the sludge is composed of flocculent colloidal particles, the particles are very fine and soft
If the sludge is dehydrated by mechanical filtration, when an external force is applied, the colloidal fine particles will block the formed filter bridge, increasing the specific resistance of the filter; and because the soft particles have a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Take urban sludge with a water content of 80.6%, add filtrate to adjust the water content to about 90%;

[0018] 2. Add 1# additive, which contains Fe 3+ Chemical raw materials, the addition amount is 0.5%, and the reaction is fully stirred for 8 minutes;

[0019] 3. Then add 2# additive, which contains Ca 2+ Chemical raw materials, the addition amount is 1.5%, and the reaction is fully stirred for 5 minutes;

[0020] 4. The sludge that has been reversed by the plunger pump is injected into the plate and frame filter press, and the sludge inlet pressure is 0.3MPa. When the sludge volume is reached, the pressure is maintained at a pressure of about 1.8MPa for 40 minutes to remove the moisture in the sludge. Lose;

[0021] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0022] The experimental data proves that after dehydration, the moisture content of the sludge reaches 57.3%, which meets the treatment requirements. ...

Embodiment 2

[0024] 1. Take municipal sludge with a water content of 78.4%, add filtrate to adjust the water content to about 90%;

[0025] 2. Add 1# additive, which contains Fe 3+ Chemical raw materials, the addition amount is 1%, and the reaction is fully stirred for 10 minutes;

[0026] 3. Then add 2# additive, which contains Ca 2+ Chemical raw materials, the addition amount is 2%, and the reaction is fully stirred for 5 minutes;

[0027] 4. The sludge that has been reversed by the plunger pump is injected into the plate and frame filter press. The sludge inlet pressure is 0.3MPa. When the sludge volume is reached, the pressure is kept at a pressure of about 2.0MPa for 50 minutes to remove the water in the sludge. Lose;

[0028] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0029] Experimental data proves that after dehydration, the moisture content of the sludge reaches 55.8%, which meets the treatment requirements.

Embodiment 3

[0031] 1. Take urban sludge with a water content of 80.2%, add filtrate to adjust the water content to about 90%;

[0032] 2. Add 1# additive, which contains Fe 3+ Chemical raw materials, the addition amount is 0.3%, and the reaction is fully stirred for 5 minutes;

[0033] 3. Then add 2# additive, which contains Ca 2+ Chemical raw materials, the addition amount is 2.5%, fully stirred and reacted for 5 minutes;

[0034] 4. The sludge that has been reversed by the plunger pump is injected into the plate and frame filter press. The sludge inlet pressure is 0.3MPa. When the sludge volume is reached, the pressure is kept at a pressure of about 2.0MPa for 50 minutes to remove the water in the sludge. Lose;

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

[0036] Experimental data proves that after dehydration, the moisture content of the sludge reaches 58.7%, which meets the treatment requirements.

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PUM

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Abstract

The invention discloses a deep dehydrating method of sludge, which comprises the following steps: a. tempering; adding filtrate in the sludge; adding chemical raw material with Fe3+ to stir; reacting for 2-12min; adding chemical raw material with Ca2+ to stir; reacting for 3-15min; b. dehydrating; introducing tempered sludge into filter press; filtering the water in the sludge; maintaining pressure at 1.5Mpa-2.5Mpa for 30-70min.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a method for deep dewatering of sludge. Background technique [0002] Sludge treatment is an easily overlooked but very critical treatment unit in sewage treatment. The key to sludge treatment is sludge glue. There are four forms of water in sludge: 1. Interstitial water or free water, which exists in Between the sludge particles, it accounts for about 65-85% of the sludge moisture; 2. Capillary water, which exists in the capillary between the sludge particles, accounts for about 15-20% of the sludge moisture; 3. Adsorbed water, adsorbed on the sludge Part of the water on the mud particles; 4. Cell water, which exists inside the sludge particles. Among them, interstitial water and adsorbed water account for 70-80% of the total water content in the sludge, and adsorbed water and cell water account for about 10% of the total water content in the sludge, so it is particu...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 李雷杨海英黄智贤李观尚
Owner 广州优特利环保科技有限公司
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