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Method and device for promoting free radical conditioning and pressure-vertical electric field dewatering of sludge through microelectrolysis

A vertical electric field and micro-electrolysis technology, applied in electrochemical sludge treatment, sludge treatment, water/sludge/sewage treatment, etc. Improve the dehydration effect, reduce the cost of the agent, and improve the dehydration performance

Inactive Publication Date: 2018-08-21
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (3) The biological method refers to adding specific active substances to the sludge, which can hydrolyze the EPS and microorganisms in the sludge, release the originally bound water, and improve the dehydration performance of the sludge. Usually, the biological method takes a long time
However, the horizontal electric field dehydration technology can remove part of the bound water to a certain extent, but its effect is not good, and the dehydration efficiency is limited

Method used

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  • Method and device for promoting free radical conditioning and pressure-vertical electric field dewatering of sludge through microelectrolysis
  • Method and device for promoting free radical conditioning and pressure-vertical electric field dewatering of sludge through microelectrolysis
  • Method and device for promoting free radical conditioning and pressure-vertical electric field dewatering of sludge through microelectrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The sludge to be dewatered is collected from a sewage treatment plant in a certain city, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 20.4g / L, the moisture content was 97.63%, and the pH value was 6.84.

[0038] 1) Activated sludge is placed in the conditioning tank;

[0039] 2) Turn on the mechanical agitator to stir the sludge with a stirring intensity of 200r / min, turn on the DC power supply, set the effective value of the voltage to 30V, and add 0.8g / g VSS iron powder and 0.8 The conditioner of g / g VSS, then keep stirring for 20min;

[0040] 3) Turn off the DC power supply, carry out gravity sedimentation to the conditioned sludge, and then discharge the supernatant;

[0041] 4) placing the concentrated sludge in the dehydration tank;

[0042] 5) Turn on...

Embodiment 2

[0045] The sludge to be dewatered is collected from a sewage treatment plant in a certain city, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 20.6g / L, the moisture content was 97.58%, and the pH value was 6.67.

[0046] 1) Activated sludge is placed in the conditioning tank;

[0047] 2) Turn on the mechanical agitator to stir the sludge with a stirring intensity of 400r / min, turn on the DC power supply, set the effective value of the voltage to 50V, and add 0.8g / g VSS iron powder and 0.8 The conditioning agent of g / g VSS, then keep stirring for 10min;

[0048] 3) Turn off the DC power supply, carry out gravity sedimentation to the conditioned sludge, and then discharge the supernatant;

[0049] 4) placing the concentrated sludge in the dehydration tank;

[0050] 5) ...

Embodiment 3

[0053] The sludge to be dewatered is collected from a sewage treatment plant in a certain city, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 20.0g / L, the moisture content was 97.97%, and the pH value was 6.87.

[0054] 1) Activated sludge is placed in the conditioning tank;

[0055] 2) Turn on the mechanical agitator to stir the sludge with a stirring intensity of 300r / min, turn on the DC power supply, set the effective value of the voltage to 40V, and add 0.8g / g VSS iron powder and 0.8 The conditioning agent of g / g VSS, then keep stirring for 10min;

[0056] 3) Turn off the DC power supply, carry out gravity sedimentation to the conditioned sludge, and then discharge the supernatant;

[0057] 4) placing the concentrated sludge in the dehydration tank;

[0058] 5) ...

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Abstract

The invention discloses a method and a device for promoting free radical conditioning and pressure-vertical electric field dewatering of sludge through microelectrolysis. The method comprises main steps as follows: sludge is stirred, a direct-current electric field is applied, and iron powder and a conditioning agent are added for conditioning; the sludge enters a pressure-vertical electric fielddewatering device for dewatering. According to the method, the microelectrolysis process of an iron powder induction electrode is enhanced through the electric field, generation of Fe<2+> is promoted,activation of sulfate is realized, sulfate free radicals and high-valence iron ions are produced, electrolysis-oxidation-flocculation coordinated conditioning is performed on the sludge, the functions of cracking of the sludge structure, bound water release and floc reconstitution are played, and the dewatering effect of the conditioned sludge in the pressure-vertical electric field is enhanced.The dewatering efficiency is high, the water content of the sludge can be reduced to 50% or below, and the water content of the sludge is effectively reduced. Besides, the method and the device also have the advantages that the reaction time is short, operation is simple, the application range is wide and the like.

Description

technical field [0001] A method and device for sludge micro-electric field conditioning-pressure vertical electric field dehydration, belonging to the field of sludge treatment and disposal. Background technique [0002] In my country, with the rapid development of society, economy and urbanization, the total amount of wastewater discharge and treatment is increasing year by year, resulting in a large amount of sludge. If it is not properly treated, it will cause new pollution to the environment. This is problems that people urgently need to face and solve. The "Water Pollution Prevention and Control Action Plan" promulgated by my country in 2015 specifically pointed out the need to promote sludge treatment and disposal. The sludge generated by sewage treatment facilities should be reduced, stabilized, harmless and resource-based. The reduction of sludge is the premise of its subsequent treatment, and in the process of reduction, sludge dehydration is a main way. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12
CPCC02F11/006C02F11/12C02F2201/46105C02F2201/46135C02F2201/48
Inventor 王毅力樊晓阳
Owner BEIJING FORESTRY UNIVERSITY
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