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Sludge deep dehydration conditioning agent and application thereof

A technology for sludge dewatering and conditioning agent, which is applied in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of high chemical consumption and sludge weight gain, and achieve the effects of low cost, low operating energy consumption, and low energy consumption

Inactive Publication Date: 2012-07-25
FOSHAN ENVIRONMENTAL PROTECTION TECH & EQUIP RES DEV PROFESSIONAL CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To solve the problem of sludge dewatering, many scholars and companies at home and abroad have developed a process of chemical conditioning and tempering combined with mechanical dehydration, which is generally called deep sludge dewatering technology, which can dehydrate sludge with a moisture content of 99% to 60% at one time. % or less, the chemical conditioners used are generally iron salts and calcium salts, supplemented by a small amount of other types of flocculants. The total amount of conditioners often accounts for 20% to 30% of the dry weight of dewatered sludge. The consumption of chemicals is high, and the weight of sludge increases significantly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) Add polyferric sulfate and ferric chloride solution to the excess sludge with a moisture content of 99.4%, the addition of polyferric sulfate is 5% of the absolute dry sludge mass, and the addition of ferric chloride is absolute dry 1% of the sludge mass, fully stirred for 20 minutes;

[0049] 2) Continue to add cationic polyacrylamide hydrosol, the amount of cationic polyacrylamide added is 0.1% of the dry sludge mass, and stir for 30 minutes;

[0050] 3) Finally, quicklime was added in an amount of 12% of the dry sludge mass, and stirred for 5 minutes to obtain conditioned sludge;

[0051] 4) Pour the conditioned sludge into the plate-and-frame filter press for dehydration. The pressure when entering the sludge is about 0.5MPa for about 60min, and then keep the pressure at 8MPa for 120min;

[0052] 5) After the pressure holding is completed, reduce the pressure and discharge the material.

[0053] The moisture content of the sludge after dehydration is 58.9%.

Embodiment 2

[0055] 1) Add polyaluminum sulfate and ferric chloride solution to the excess sludge with a moisture content of 98.5%, the addition of polyaluminum sulfate is 7% of the absolute dry sludge mass, and the addition of ferric chloride is absolute dry 1.2% of the sludge mass, fully stirred for 20 minutes;

[0056] 2) Continue to add anionic polyacrylamide hydrosol, the amount of anionic polyacrylamide added is 0.1% of the dry sludge mass, and stir for 30 minutes;

[0057] 3) Finally, quicklime was added in an amount of 12% of the dry sludge mass, and stirred for 5 minutes to obtain conditioned sludge;

[0058] 4) Inject the conditioned sludge into the plate-and-frame filter press for dehydration, the pressure when entering the sludge is about 0.5MPa, last for about 60min, and then keep the pressure at 8MPa for 120min;

[0059] 5) After the pressure holding is completed, reduce the pressure and discharge the material.

[0060] The moisture content of the sludge after dehydration i...

Embodiment 3

[0062] 1) Add polyferric sulfate and ferric sulfate solution to the excess sludge with a moisture content of 98.0%, the amount of polyferric sulfate added is 6% of the absolute dry sludge, and the amount of ferric sulfate added is 2% of the absolute dry sludge , fully stirred for 20 minutes;

[0063] 2) Continue to add cationic polyacrylamide hydrosol, the amount of cationic polyacrylamide added is 0.15% of the dry sludge mass, and stir for 30 minutes;

[0064] 3) Add slaked lime at last, the addition amount is 10% of the absolute dry sludge mass, stir for 10min, obtain the conditioned sludge;

[0065] 4) Inject the conditioned sludge into the plate-and-frame filter press for dehydration. The pressure when entering the sludge is about 1.0MPa, last for about 50min, and then keep the pressure at 10MPa for 120min;

[0066] 5) After the pressure holding is completed, reduce the pressure and discharge the material.

[0067] The moisture content of the sludge after dehydration is ...

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Abstract

The invention discloses a sludge deep dehydration conditioning agent and application thereof. The sludge deep dehydration conditioning agent consists of an inorganic polymer flocculant, an iron compound, an organic polymer flocculant and a calcium compound. The sludge deep dehydration conditioning agent is low in cost and less in dosage, and can effectively reduce the sludge dewatering cost. After being conditioned, sludge is low in dewatering pressure, operation energy consumption and cost, and the moisture content of the sludge can be directly reduced to less than 60%, so that the subsequent treatment for the sludge can be more conveniently carried out. A sludge deep dehydration method comprises the steps of: adding the inorganic polymer flocculant and the iron compound into the sludge, evenly stirring, then adding the organic polymer flocculant into the obtained mixture, and evenly stirring; after that, adding the calcium compound into the obtained mixture, evenly stirring so as to obtain the conditioned sludge; and finally, carrying out filter pressing and dehydration on the conditioned sludge. The sludge deep dehydration can be realized by low cost and low energy consumption.

Description

technical field [0001] The invention relates to a sludge dehydration regulator and a sludge dehydration method, in particular to a sludge deep dehydration regulator and its application. Background technique [0002] With the rapid development of our country's social economy, the degree of intensification of industry and agriculture is getting higher and higher, and the amount of sludge produced by urban domestic sewage treatment plants is also increasing. How to properly dispose of these increasingly large quantities of organic waste generated every day Solid waste has become the most troublesome problem for sewage treatment plants. [0003] The high moisture content of sludge and the difficulty in dehydration are the key obstacles restricting sludge treatment and disposal. The moisture in sludge can be divided into four types according to its state: 1) interstitial water, which is free water surrounded by sludge particles, generally accounting for about 70% of the total wa...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 徐荣险周顺桂王定美王跃强
Owner FOSHAN ENVIRONMENTAL PROTECTION TECH & EQUIP RES DEV PROFESSIONAL CENT
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