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A method for improving sludge dewatering performance by combined conditioning with segmented microbubble ozone and surfactant

A surfactant and sludge dewatering technology is applied in the field of improving sludge dewatering performance and improving the dewatering performance of excess sludge in sewage treatment plants. EPS structure damage is not good and other problems, to achieve the effect of improving oxidation efficiency, low price, and reducing sludge volume

Active Publication Date: 2020-09-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor sludge EPS structure destruction effect in existing sludge conditioning, release of bound water inside microbial cells, and insignificant sludge dehydration effect after conditioning, and provide a combination of segmented microbubble ozone and surfactants. Conditioning method to improve sludge dewatering performance, specifically a sludge dehydration conditioning method of oxidation-floc destruction-hydrophilic substance stripping-hydrophilic small molecular substance degradation, through ozone oxidation to achieve moderate sludge floc Cracking and release of bound water, and then positive charge neutralization with cationic surfactants to further increase the size of sludge flocs, and use its compatibilization effect to further dissolve extracellular polymers into the liquid phase, and finally Then use the oxidation of ozone to degrade the hydrophilic small molecular organic matter in the sludge liquid phase, realize the conversion of bound water to free water, and improve the dehydration performance of sludge

Method used

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  • A method for improving sludge dewatering performance by combined conditioning with segmented microbubble ozone and surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The sludge to be dewatered treated in this example was collected in a domestic sewage treatment plant in Minhang District, Shanghai. The sewage treatment plant uses A 2 The O process treats municipal sewage. The sludge to be dewatered is collected in the secondary settling tank. After being retrieved, the sludge was gravity settled for 8 hours, and passed through 10 mesh and 50 mesh screens, and the moisture content of the sludge was 99.5%. In the form of microbubbles (the average size of the bubbles produced is less than 100μm), pass ozone with a concentration of 70mg / g dry sludge into the sludge, react for 30 minutes, and break the sludge flocs and cells; then add 0.3 to the sludge g / g CTAB of dry sludge, stir at 350r / min for 1 min, and then at 50r / min for 10 min to promote the release of extracellular polymers and bound water in the sludge into the liquid phase; The ozone with a concentration of 30mg / g dry sludge is passed into the treated sludge solution in the form...

Embodiment 2

[0036] The sludge to be dewatered treated in this example was collected in a domestic sewage treatment plant in Minhang District, Shanghai. The sewage treatment plant uses A 2 The O process treats municipal sewage. The sludge to be dewatered is collected in the secondary settling tank. After being retrieved, the sludge was gravity settled for 8 hours, and passed through 10 mesh and 50 mesh screens. The moisture content of the sludge was 99%. In the form of microbubbles (the average size of the bubbles produced is less than 100μm), pass ozone with a concentration of 50mg / g dry sludge into the sludge, react for 15 minutes, and break the sludge flocs and cells; then add 0.2 to the sludge g / g dry sludge octadecyl trimethyl ammonium chloride (a kind of quaternary ammonium salt type surfactant), stirred at a speed of 250r / min for 3 minutes, and then stirred at a speed of 100r / min for 5 minutes, Promote the release of extracellular polymer and bound water in the sludge into the liqui...

Embodiment 3

[0038] The sludge to be dewatered treated in this example was collected in a domestic sewage treatment plant in Minhang District, Shanghai. The sewage treatment plant uses A 2 The O process treats municipal sewage. The sludge to be dewatered is collected in the secondary settling tank. After being retrieved, the sludge was gravity settled for 8 hours and passed through a 10 mesh and 50 mesh screen. The moisture content of the sludge was 99.3%. In the form of microbubbles (the average size of the bubbles produced is less than 100μm), pass ozone with a concentration of 60mg / g dry sludge into the sludge, react for 20 minutes, and break the sludge flocs and cells; then add 0.15 to the sludge g / g CTAB of dry sludge, stir at 300r / min for 2min, and then at 80r / min for 8min to promote the release of extracellular polymers and bound water in the sludge into the liquid phase; Pass the ozone with a concentration of 25mg / g dry sludge into the treated sludge solution in the form of microbu...

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Abstract

The invention provides a method for improving the dehydration performance of sludge by using combined regulation of segmented micro-bubble ozone and surfactant. The method comprises the following steps: S1, settling original sludge by virtue of gravity, and sieving; S2, introducing the ozone into the sludge treated in step S1 in a micro-bubble form, and performing the reaction; S3, uniformly mixing the surfactant and the sludge treated in step S2, and stirring and reacting; and S4, introducing the micro-bubble ozone into the sludge treated in step S3, and dehydrating to obtain sludge cakes. Byvirtue of the oxidization of the micro-bubble ozone, the capacity increment of the surfactant and the neutralization effect of charges, the appropriate degradation of the sludge, dissolution of organic matter in liquid phase, reconstruction of floc and granularity increment can be realized, then the hydrophilic small molecular organic matters can be degraded by virtue of the oxidization of ozone,the conversion of bound water to free water can be realized, and finally the dehydration performance of the sludge can be improved. The method has the advantages of apparent synergistic effect, convenience in operation, low regulator expense, wide application range, significant dehydration effect and the like.

Description

Technical field [0001] The invention belongs to the technical field of residual sludge treatment and disposal of urban sewage plants, and relates to a method for improving the dewatering performance of residual sludge in a sewage treatment plant, and specifically is a method for improving the dewatering performance of sludge by combining segmented microbubble ozone and surfactants. Methods. Background technique [0002] Sludge is a by-product in the biological treatment of sewage. It contains nutrients, pathogens, persistent organic pollutants, heavy metals, etc., which can easily cause secondary pollution to the environment if it is improperly treated. As the amount of domestic sewage produced in my country's cities has also increased, the output of sludge has also increased sharply, which has brought tremendous pressure to the environment. [0003] As a hydrophilic substance, the water content of sludge is usually above 99%. In order to reduce the cost of sludge transportation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/143C02F11/147C02F11/15
CPCC02F11/14
Inventor 袁海平朱南文俞璐边畅楼紫阳
Owner SHANGHAI JIAOTONG UNIV