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Additive for sludge deep dehydration

A technology of deep dehydration and additives, applied in the direction of dehydration/drying/thickened sludge treatment, etc., which can solve the problems of difficult dehydration, high cost, and large amount of addition

Inactive Publication Date: 2007-05-16
GUANGZHOU PUDE ENVIRONMENTAL EQUIP
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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
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 certain compressibility, when the external force increases, the particles will form a gap on the surface of the filter medium. A "curtain" with very small pores, so that water cannot pass through, and dehydration is extremely difficult
[0004] In order to solve this problem, filter aids can only be added, typically diatomaceous earth and lime, but to achieve better results, the amount of addition is relatively large, which makes the cost high
The increase of diatomite and lime addition limits the way of comprehensive utilization of subsequent treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Take urban sludge with a water content of 80.6%, add filtrate to adjust the water content to about 90%;

[0017] 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;

[0018] 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;

[0019] 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;

[0020] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0021] The experimental data proves that after dehydration, the moisture content of the sludge reaches 57.3%, which meets the treatment requirements. ...

Embodiment 2

[0023] 1. Take municipal sludge with a water content of 78.4%, add filtrate to adjust the water content to about 90%;

[0024] 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;

[0025] 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;

[0026] 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;

[0027] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0028] Experimental data proves that after dehydration, the moisture content of the sludge reaches 55.8%, which meets the treatment requirements.

Embodiment 3

[0030] 1. Take urban sludge with a water content of 80.2%, add filtrate to adjust the water content to about 90%;

[0031] 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;

[0032] 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;

[0033] 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;

[0034] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0035] Experimental data proves that after dehydration, the moisture content of the sludge reaches 58.7%, which meets the treatment requirements.

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Abstract

The invention discloses an additive of deep dehydrated sludge, which consists of 0.3-2% Fe3+ chemical raw material and 0.5-5% Ca2+ chemical raw material. The charge of colloid particle is neutralized with particle unstably, which sediments to filter water.

Description

technical field [0001] The invention belongs to sludge treatment technology, in particular to an additive for deep dehydration 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 particularly crit...

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 GUANGZHOU PUDE ENVIRONMENTAL EQUIP
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