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Method for circularly conditioning and dehydrating sludge

A sludge recycling and sludge technology, applied in sludge treatment, electrochemical sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of unrealized dehydration and difficult treatment, and achieve good dehydration effect and equipment Ease of operation and improved dehydration performance

Active Publication Date: 2021-11-26
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After being treated by a single conditioning method, the sludge is still a mixture of mud and water, and no real dehydration has been achieved, which brings great difficulties to the subsequent treatment

Method used

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  • Method for circularly conditioning and dehydrating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The circulating sludge discharge pipe is located at 1 / 2 of the gravity concentration tank 3, and the mouth of the circulating sludge inlet pipe 1 is 30cm deeper than the nozzle of the fresh excess sludge inlet pipe 2.

[0021] Taking excess sludge with a water content of 98.2%-99.5% as the processing object, the excess sludge is injected into the gravity thickening tank 3 through the fresh excess sludge inlet pipe 2 . After the fresh excess sludge is concentrated in the gravity concentration tank 3 for 5 hours, the valve 10 on the circulating sludge discharge pipe is opened, so that the sludge in the layered sedimentation zone flows into the adjustment tank 5 under the action of gravity, and the sediment is passed through The mud discharge pipe 4 is discharged.

[0022] After the sludge in the stratified sedimentation zone flows into the regulating tank 5, sodium sulfate is added as an electrolyte, and the ratio of the added sodium sulfate to the sludge is 6 mg / L. Blas...

Embodiment 2

[0028] The circulating sludge discharge pipe is located at 1 / 2 of the gravity concentration tank 3, and the mouth of the circulating sludge inlet pipe 1 is 50 cm deeper than the nozzle of the fresh surplus sludge inlet pipe 2.

[0029] Taking excess sludge with a water content of 98.2%-99.5% as the processing object, the excess sludge is injected into the gravity thickening tank 3 through the fresh excess sludge inlet pipe 2 . After the fresh excess sludge is concentrated in the gravity concentration tank 3 for 5 hours, the valve 10 on the circulating sludge discharge pipe is opened, so that the sludge in the layered sedimentation zone flows into the adjustment tank 5 under the action of gravity, and the sediment is passed through The mud discharge pipe 4 is discharged.

[0030] After the sludge in the stratified sedimentation zone flows into the regulating tank 5, sodium sulfate is added as an electrolyte, and the ratio of the added sodium sulfate to the sludge is 6 mg / L. Bl...

Embodiment 3

[0036] The circulating sludge discharge pipe is located at 2 / 3 of the gravity thickening tank 3, and the mouth of the circulating sludge inlet pipe 1 is 80 cm deeper than the nozzle of the fresh surplus sludge inlet pipe 2.

[0037] Taking excess sludge with a water content of 98.2%-99.5% as the processing object, the excess sludge is injected into the gravity thickening tank 3 through the fresh excess sludge inlet pipe 2 . After the fresh excess sludge is concentrated in the gravity concentration tank 3 for 5 hours, the valve 10 on the circulating sludge discharge pipe is opened, so that the sludge in the layered sedimentation zone flows into the adjustment tank 5 under the action of gravity, and the sediment is passed through The mud discharge pipe 4 is discharged.

[0038] After the sludge in the stratified sedimentation zone flows into the regulating tank 5, sodium sulfate is added as an electrolyte, and the ratio of the added sodium sulfate to the sludge is 6 mg / L. Blast...

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Abstract

A method for circularly conditioning and dehydrating sludge is provided by invention. Excess sludge is fed into a gravity concentration tank for preliminary concentration so as to separate sludge and water which are easy to separate, and sludge which is difficult to dehydrate is conveyed into an adjusting tank for full aeration; and then the sludge is sent to an electrochemical oxidation device to condition the sludge in a layered precipitation zone through electrochemical cathode and anode coupling oxidation, the structure of a flocculating constituent in the sludge is destroyed, cell walls of microorganisms are subjected to cell lysis, capillary water and bound water are released, and then the sludge is sent back to the gravity concentration tank to be separated again, so that the dewatering performance of the sludge is improved. According to the method, an electrochemical oxidation conditioning technology and a gravity concentration technology are organically combined to construct a residual sludge reduction circular treatment process, and the method has the advantages of simple equipment operation, low treatment cost, no secondary pollution, good sludge reduction effect and the like, and is an environment-friendly process method.

Description

technical field [0001] The invention relates to the field of excess sludge conditioning and dehydration, in particular to a sludge circulation conditioning and dehydration method. Background technique [0002] Worldwide, the environmental pollution caused by economic development and population expansion is quite serious. The activated sludge method is usually used for the purification of municipal sewage and industrial wastewater, and one of its technical disadvantages is that it produces a large amount of residual sludge. These sludges are complex in composition and high in water content, and often contain a large amount of heavy metals and pathogenic bacteria, which are harmful to the human body and the environment, and are bulky and difficult to transport and store. Most of the sludge is disposed of by landfill or incineration after dehydration and drying, but the existence of capillary water and bound water makes dehydration very difficult. Dehydration of sludge is a k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/15C02F11/121C02F11/00
CPCC02F11/15C02F11/121C02F11/006
Inventor 施钦谭学才刘绍刚刘宇川黄政邦敬康
Owner GUANGXI UNIV FOR NATITIES
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