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Quantitative reduction method for biological sludge

A biological sludge and sludge technology, applied in biological sludge treatment, sludge treatment and other directions, can solve the problems of high energy consumption, difficulty in breaking the microbial cell wall, and high cost, saving alkali consumption and reducing the cost of wall breaking. , the effect of reducing costs

Active Publication Date: 2008-05-21
ASIA SYMBOL SHANDONG PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of breaking the microbial cell wall, it needs to consume a lot of energy, and the high cost is the difficulty.

Method used

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  • Quantitative reduction method for biological sludge

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Experimental program
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Effect test

Embodiment 1

[0021] Import the sludge discharged from the final sedimentation tank into the sludge pretreatment tank for aeration, control the dissolved oxygen at about 2.0 mg / l, and aerate for 2 hours. Then send it to the precipitation tower to concentrate it by 1 time, send it to the mixing tank, add NaOH liquid to adjust the pH value to 10.6, and then send it to the ultrasonic reactor at 1.34W / cm 2 Sludge wall breaking was carried out for 10 minutes under the sound energy density. After the wall is broken, it is sent to the biological hydrolysis tank for hydrolysis, and then sent to the aeration tank of the sewage treatment process for biological decomposition. Results Compared with the system without aeration, under the condition of the same wall-breaking effect, the amount of alkali is reduced by 35%, and the operating cost is reduced.

Embodiment 2

[0023] The sludge discharged from the final sedimentation tank is introduced into the sludge thickening tank, and the concentrated sludge is sent to the sludge pretreatment tank for aeration, and the dissolved oxygen is controlled at about 1.5mg / l for 2.5 hours of aeration. Then send it to the sedimentation tower to further concentrate it, then send it to the reactor to react with the incoming ozone to break the wall, after the wall breaking is completed, send it to the biohydrolysis tank for hydrolysis, and then send it to the exposure of the sewage treatment process The gas pool is used for biological decomposition.

Embodiment 3

[0025] Import the sludge discharged from the final sedimentation tank into the sludge pretreatment tank for aeration, control the dissolved oxygen at about 4.5mg / l, and aerate for 15 minutes. Then send it to the sedimentation tower to concentrate it, then send it to the reaction tank, add NaOH liquid to adjust the pH value to 11 and heat it to 50°C to break the sludge wall, and send it to the aeration tank of the sewage treatment process after the wall breaking is completed. Biodegradation.

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Abstract

The invention relates to a biological sludge treatment method, which belongs to a biological sludge quantitative reduction method in the water treatment field. The aeration treatment is implemented onresidual sludge before the cell disruption. The time of the aeration treatment is 15-300 minutes; and dissolved oxygen of the sludge is 0.3-4.5mg / l. The invention has the advantages that the optimalaeration is implemented on settling sludge before the disruption under the condition of lacking nutrients. And the sludge is condensed before and after the aeration. The character of the sludge can berapidly changed through small amount of aeration. The following disruption becomes easy. The disruption effect is improved and the disruption cost is lowered. The following cost is greatly lowered with small amount of investment. For example, the ultrasonic disruption under the alkaline condition can save 35 percent of the alkaline using amount. And through the hydrolysis after the disruption, the biological decomposability is increased, which provides conditions for ensuring the effluent quality.

Description

technical field [0001] The invention relates to a treatment method of biological sludge, which belongs to the reduction method of biological sludge in the field of water treatment. Background technique [0002] A large amount of wastewater is discharged in various industrial processes and living activities. The most common application is microbial treatment, and a large amount of sludge is generated in the microbial treatment process. The cost of sludge treatment and disposal is high, which greatly increases the cost of wastewater treatment. In addition, in the process of sludge treatment and disposal, new environmental problems will also arise. Therefore, the reduction of sludge has attracted people's attention. In terms of sludge reduction, many methods have been tried and applied. Among them, the method of dissolving the substance in water after the cell wall of the sludge is broken, and then decomposing it by other microorganisms to achieve the reduction is effective. ...

Claims

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Application Information

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IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 张书廷张晗
Owner ASIA SYMBOL SHANDONG PULP & PAPER
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