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Sludge dewatering method achieved by combining microwaves with compound flocculating agent

A sludge dehydration and composite technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of high biological toxicity of sludge, large dosage of chemicals, and expensive conditioning costs, etc. Achieve the effects of promoting coagulation, reducing the dosage of chemicals, and reducing the volume of sludge

Inactive Publication Date: 2016-10-12
河南永泽环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, the sludge in the sludge thickening tank in our country is usually chemically conditioned by polyacrylamide, a chemical agent with coagulation effect, and then mechanical dehydration equipment (such as belt filter press, centrifugal dehydrator, etc.) is used to dehydrate the sludge. The sludge is dehydrated and reduced in volume; the moisture content of the sludge after mechanical dehydration is generally about 80%, which is difficult to further reduce, and the dosage of chemicals is large, the conditioning cost is expensive, and the sludge after dehydration treatment has high biotoxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A sludge dewatering method using microwave and composite flocculant, comprising the following steps:

[0022] 1) Microwave radiation: Microwave radiation is performed on the sludge (water content 97.5%) concentrated in the sludge concentration tank for 45s, the microwave frequency is 2450MHz, and the power is 700w;

[0023] 2) Flocculation: add a composite flocculant to the sludge prepared in step 1), the dosage of the composite flocculant is 0.1% of the dry weight of the sludge, first stir rapidly for 4 minutes, and the stirring rate is 150 r / min , and then stirred at a slow speed for 10 minutes, and the stirring rate was 50 r / min;

[0024] 3) Dehydration: The flocculated sludge obtained in step 2) is dehydrated by pressure filtration to obtain a mud cake with a moisture content of 59.5%.

[0025] The composite flocculant is made of the following components by weight percentage by mechanical stirring and mixing for 5 minutes: fly ash 50%, chitosan 10%, polyacrylamide ...

Embodiment 2

[0027] A sludge dewatering method using microwave and composite flocculant, comprising the following steps:

[0028] 1) Microwave radiation: Microwave radiation is performed on the sludge (water content 97.5%) concentrated in the sludge concentration tank for 55s, the microwave frequency is 2450MHz, and the power is 1000w;

[0029] 2) Flocculation: add a composite flocculant to the sludge prepared in step 1), the dosage of the composite flocculant is 0.4% of the dry weight of the sludge, first stir rapidly for 5 minutes, and the stirring rate is 200 r / min , and then stirred at a slow speed for 12 minutes at a stirring rate of 80 r / min to obtain flocculated sludge;

[0030] 3) Dehydration: The flocculated sludge obtained in step 2) is dehydrated by pressure filtration to obtain a mud cake with a moisture content of 55.2%.

[0031] The composite flocculant is made of the following components by weight percentage by mechanical stirring and mixing for 10 minutes: fly ash 60%, chi...

Embodiment 3

[0033] A sludge dewatering method using microwave and composite flocculant, comprising the following steps:

[0034] 1) Microwave radiation: Microwave radiation is performed on the sludge (water content 97.5%) concentrated in the sludge concentration tank for 50s, the microwave frequency is 2450MHz, and the power is 850w;

[0035] 2) Flocculation: add a composite flocculant to the sludge prepared in step 1), the dosage of the composite flocculant is 0.3% of the dry weight of the sludge, first stir rapidly for 4.5min, and the stirring rate is 180 r / min, then stirred at a slow speed for 11 min, and the stirring rate was 65 r / min to obtain flocculated sludge:

[0036] 3) Dehydration: The flocculated sludge obtained in step 2) is dehydrated by pressure filtration to obtain a mud cake with a moisture content of 57.5%.

[0037] The composite flocculant is compounded by the following components by weight percentage by mechanical stirring and mixing for 7 minutes: fly ash 55%, chito...

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PUM

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Abstract

The invention discloses a sludge dewatering method achieved by combining microwaves with a compound flocculating agent, and belongs to the technical field of sludge treatment. The method comprises the following steps of 1, microwave radiation, wherein microwave radiation is carried out on concentrated sludge for 45 s to 55 s; 2, flocculating, wherein the compound flocculating agent is added into the sludge prepared in the step 1, the mixture is stirred to be uniform, and flocculated sludge is prepared; 3, dewatering, wherein the flocculated sludge prepared in the step 2 is subjected to filter pressing and dewatering. The water content of the sludge treated through the method is reduced to 55% to 60% from 97% to 99%, the volume of the sludge is greatly reduced, and therefore the subsequent treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge dewatering method using microwaves and composite flocculants. Background technique [0002] With the rapid development of social economy and urbanization, the discharge of urban domestic sewage and industrial sewage is increasing, and the discharge of by-product sludge generated in sewage treatment is also increasing. A large amount of sludge is generated, its composition is relatively complex, its organic matter content is high, its hydrophilicity is strong, its specific surface area is large, and its dehydration is difficult, which has become a bottleneck problem in sludge treatment and disposal technology. Sludge dehydration is a very critical step in sludge treatment and disposal; currently, sludge disposal methods mainly include landfill, composting and incineration. When sludge is landfilled, sludge dehydration can greatly reduce the accumulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
CPCC02F11/14C02F11/12C02F11/122
Inventor 曹艳艳周素莹张体良车晓玲
Owner 河南永泽环境科技有限公司