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Sludge conditioning-horizontal alternating current field dewatering method and device

An AC electric field and sludge conditioning technology, applied in sludge treatment, electrochemical sludge treatment, water/sludge/sewage treatment, etc. The problem of large sludge resistance, etc., can avoid the large resistance of anode sludge, shorten the conditioning time, and improve the dehydration efficiency.

Inactive Publication Date: 2016-12-21
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent can make the moisture content of the dewatered sludge reach 50%, but under the synergistic effect of the pressure field, if the pressure field is removed and the magnetic material conditioning-horizontal electric field dehydration process is performed separately, the moisture content of the sludge after dehydration is at least 89.96 %, the effect is not significant
[0013] Aiming at the shortcomings of the above patents, such as long sludge conditioning period, high dehydration energy consumption, low horizontal electric field dehydration efficiency without pretreatment, high horizontal electric field anode sludge resistance, and insignificant cracking effect of magnetic powder conditioning, the present invention aims to provide a conditioner Conditioning and dehydration method and device with short time, good cracking effect of sludge extracellular polymer, and high horizontal electric field dehydration efficiency

Method used

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  • Sludge conditioning-horizontal alternating current field dewatering method and device
  • Sludge conditioning-horizontal alternating current field dewatering method and device
  • Sludge conditioning-horizontal alternating current field dewatering method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The sludge to be dewatered treated in this embodiment was collected from a sewage treatment plant in Beijing, and the sewage treatment plant used the A2O 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 13.6g / L, the moisture content was 98.62%, and the pH value was 7.04.

[0040] 1) Put the sludge in the conditioning and dehydration integrated device;

[0041] 2) Turn on the AC power supply, set the effective value of the electrolysis voltage to 5.0V, turn on the mechanical stirrer, and stir the sludge at a stirring intensity of 200 r / min, and add 1.0 g / gVSS of Fe to the sludge at the same time 0 And the potassium persulfate of 0.5 g / gVSS, then continue to stir 70min;

[0042] 3) Turn off the AC power, settle the conditioned sludge by gravity, and then discharge the supernatant;

[0043] 4) Turn on the AC ...

Embodiment 2

[0046] The sludge to be dewatered treated in this embodiment was collected from a sewage treatment plant in Beijing, and the sewage treatment plant used the A2O 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 13.6g / L, the moisture content was 98.62%, and the pH value was 7.04.

[0047] 1) Put the sludge in the conditioning and dehydration integrated device;

[0048] 2) Turn on the AC power supply, set the effective value of the electrolysis voltage to 9.0V, turn on the mechanical stirrer, and stir the sludge at a stirring intensity of 400 r / min, and add 1.0 g / gVSS of Fe to the sludge at the same time 0 And the potassium persulfate of 0.5 g / gVSS, then keep stirring for 50min;

[0049] 3) Turn off the AC power, settle the conditioned sludge by gravity, and then discharge the supernatant;

[0050] 4) Turn on the AC...

Embodiment 3

[0053] The sludge to be dewatered treated in this embodiment was collected from a sewage treatment plant in Beijing, and the sewage treatment plant used the A2O 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 13.6g / L, the moisture content was 98.62%, and the pH value was 7.04.

[0054] 1) Put the sludge in the conditioning and dehydration integrated device;

[0055] 2) Turn on the AC power supply, set the effective value of the electrolysis voltage to 7.0V, turn on the mechanical stirrer, and stir the sludge at a stirring intensity of 300 r / min, and add 1.0 g / gVSS of Fe to the sludge at the same time 0 And the potassium persulfate of 0.5 g / gVSS, then keep stirring for 50min;

[0056] 3) Turn off the AC power, settle the conditioned sludge by gravity, and then discharge the supernatant;

[0057] 4) Turn on the AC...

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Abstract

The invention relates to a sludge conditioning-horizontal alternating current field dewatering method and device. The method is completed in a conditioning and dewatering integrated device, the synergistic effect of alternating-current electric field disintegration and sulfate radical free radical oxidation is used, so that the sludge is subjected to homogenization disintegration, extracellular polymeric substances (EPS) are decomposed, part of bound water is converted into free water, and then the bound water and the free water are uniformly removed under the electroosmosis action of the horizontal alternating current field. The method comprises the following steps: adding a zero-valent iron (Fe<0>) and persulfate into the sludge, applying an alternating current field for sludge conditioning, then performing sedimentation and horizontal alternating current field dewatering. The integrated device comprises a conditioning dewatering tank, an alternating current power supply, a mechanical stirrer, a sludge conveying pump and a valve. The conditioning dehydration method disclosed by the invention is high in dehydration efficiency; the moisture content of the dewatered sludge can be reduced to 80%; the corresponding integrated device is compact in structure, simple to operate and capable of recycling the conditioner.

Description

technical field [0001] A method and device for sludge conditioning-horizontal AC electric field dehydration, which belong to the field of sludge treatment. Background technique [0002] In recent decades, the amount of sludge produced by municipal and industrial sewage treatment plants around the world has risen rapidly due to sewage treatment and purification. In my country's "Twelfth Five-Year Plan", the sewage treatment capacity has increased by 90 million m 3 , there are more than 1,800 sewage treatment plants under construction or newly built. As of the end of March 2014, a total of 3,622 sewage treatment plants have been built in cities and towns in my country, with a sewage treatment capacity of about 153 million m 3 / d, the sludge output with 80% water content has exceeded 30 million t / a. At present, the main methods of sludge treatment and disposal include sludge landfill, sludge thermal drying, sludge incineration, sludge composting, sludge power plant co-firing, ...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12C02F11/06
CPCC02F11/006C02F11/06C02F11/12
Inventor 王毅力李昊轩
Owner BEIJING FORESTRY UNIVERSITY
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