Sludge dewatering flocculating agent and dewatering method thereof

A sludge dehydration and flocculant technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of long dehydration cycle, low dehydration rate, large dosage, etc., and achieve low price, cost saving and operation cost reduction Effect

Inactive Publication Date: 2014-09-03
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing technologies have the defects of large dosage, high cost, low dehydration rate and long dehydration cycle.
In addition, for the slu

Method used

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  • Sludge dewatering flocculating agent and dewatering method thereof

Examples

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Example Embodiment

[0032] Example 1

[0033] (1) Prepare 50Kg of the sludge dewatering flocculant, wherein the content of each component of the flocculant is as follows: alumina 2.5Kg, chitin 9Kg, silica 12.5Kg, acrylamide 12Kg, sodium chloride 7.5Kg, Concentrated sulfuric acid 6.5Kg, mix the alumina, chitin, silicon dioxide, acrylamide, and sodium chloride according to the stated weight and grind them into powder, set aside, put the concentrated sulfuric acid alone and set aside;

[0034] (2) Take 1 ton of sludge to be treated with a moisture content of 60%, add the ground powder described in step (1) to the sludge, stir it evenly, and then add it to the sludge in step (1) The said weight of concentrated sulfuric acid is continuously stirred evenly to obtain conditioned sludge;

[0035] (3) Let the sludge tempered in step (2) stand for 25 to 45 minutes. After standing still, the sludge, moisture layer, and sludge will settle on the bottom layer, and the clearer water will gather on the top of the slu...

Example Embodiment

[0036] Example 2

[0037] (1) Prepare 80Kg of the sludge dewatering flocculant, wherein the content of each component of the flocculant is as follows: alumina 21.6Kg, chitin 3.2Kg, silica 20Kg, acrylamide 19.2Kg, sodium chloride 14.4Kg , Concentrated sulfuric acid 1.6Kg, mix the alumina, chitin, silicon dioxide, acrylamide, and sodium chloride according to the stated weight and grind them into powder, set aside, put the concentrated sulfuric acid alone, set aside ;

[0038] (2) Take 1 ton of sludge to be treated with a moisture content of 70%, add the ground powder described in step (1) to the sludge, stir evenly, and then add it to the sludge in step (1) The said weight of concentrated sulfuric acid is continuously stirred evenly to obtain conditioned sludge;

[0039] (3) Let the sludge tempered in step (2) stand for 25 to 45 minutes. After standing still, the sludge, moisture layer, and sludge will settle on the bottom layer, and the clearer water will gather on the top of the sl...

Example Embodiment

[0040] Example 3

[0041] (1) Prepare 100Kg of the sludge dewatering flocculant, wherein the content of each component of the flocculant is as follows: 25Kg of alumina, 18Kg of chitin, 13Kg of silica, 24Kg of acrylamide, 10Kg of sodium chloride, 10Kg of concentrated sulfuric acid , The alumina, chitin, silica, acrylamide, and sodium chloride are uniformly mixed according to the weight and then crushed into powder, for use, and the concentrated sulfuric acid is placed separately for use;

[0042] (2) Take 1 ton of sludge to be treated with a moisture content of 80%, add the ground powder described in step (1) to the sludge, stir evenly, and then add it to the sludge in step (1) The said weight of concentrated sulfuric acid is continuously stirred evenly to obtain conditioned sludge;

[0043] (3) Let the sludge tempered in step (2) stand for 25 to 45 minutes. After standing still, the sludge, moisture layer, and sludge will settle on the bottom layer, and the clearer water will gather...

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Abstract

The invention relates to a sludge dewatering flocculating agent and a dewatering method thereof. The sludge dewatering flocculating agent is composed of the following compositions in percent by weight: 5-27% of aluminium oxide, 4-18% of chitin, 13-25% of silicon dioxide, 10-24% of acrylamide, 6-18% of sodium chloride and 2-13% of concentrated sulfuric acid. The flocculating agent is wide in raw material source and low in price. The invention also provides the deep dewatering method of the efficient flocculating agent. By utilizing the sludge dewatering flocculating agent and the dewatering method thereof for processing sludge, the sludge dewatering time is reduced, and also deep dewatering of sludge is realized. 1 ton of sludge with the water content of 60%-99% can be dewatered to have the water content of 25-45% in 45 min, subsequent processing of sludge is substantially facilitated, requirements on subsequent second ploughing and greening are satisfied, and the processing and disposing problems of a large amount of stacked sludge are solved. Additionally, the method does not using press filtration or centrifugation equipment, so that the operation cost for dewatering processing of sludge is substantially reduced.

Description

technical field [0001] The invention belongs to sludge dewatering technology, in particular to a sludge dewatering flocculant and a dehydration method thereof. Background technique [0002] In recent years, with the rapid development of my country's social economy and the rapid increase of population density, the sewage treatment capacity of urban sewage treatment plants in my country is increasing day by day, which will generate a large amount of activated sludge, and the secondary pollution caused by it can no longer be ignored. Because these activated sludges are not only very unstable in nature, poor in mechanical properties, and highly perishable, but also very large in size and high in moisture content, there is a common problem of "heavy water and light sludge", which is not conducive to transportation and disposal, and cannot be followed up. land use, resulting in a lot of waste of land resources. Therefore, as a waste with huge environmental pollution hazards, how ...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 孟庆山王帅秦月雷学文程福周谢德才
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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