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Combined ultrasonic whirl and disintegration process for surplus sludge

A technology of excess sludge and ultrasound, which is applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of increased organic matter content in sludge, and reduce moisture content, The effect of solving disposal and processing problems, safe and reliable operability

Inactive Publication Date: 2018-05-18
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process not only has the characteristics of simple operation, no secondary pollution, and low cost, but also increases the content of organic matter in the sludge after cracking, which can improve the degradability and dehydration of sludge, and solve the problem of the existing single ultrasonic cracking technology. defect on

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  • Combined ultrasonic whirl and disintegration process for surplus sludge
  • Combined ultrasonic whirl and disintegration process for surplus sludge
  • Combined ultrasonic whirl and disintegration process for surplus sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) After the excess sludge produced in the secondary sedimentation tank of the urban domestic sewage treatment plant is concentrated by gravity sedimentation, the moisture content of the sludge is 93.70%, the pH is 7.5, and the total solid content MLSS in the excess sludge is determined to be 1238mg / L , TCOD is 1478mg / L, of which soluble COD is 330mg / L, TN is 5.2mg / L, and TP is 0.22mg / L.

[0047] (2) Take 5L of residual sludge after gravity sedimentation concentration pretreatment and put it into the water inlet tank, use the cyclone alone to crack the residual sludge, and set the cyclone operating pressure of the inlet pressure gauge 5 to 0.1MPa and The cycle cracking time is 5min. After cracking, the residual sludge SCOD is 524mg / L, TN is 13.7mg / L, TP is 0.65mg / L, the sludge cracking rate is 16.89%, and the sludge moisture content is 92.78%.

Embodiment 2

[0049] (1) After the excess sludge produced in the secondary sedimentation tank of the urban domestic sewage treatment plant is concentrated by gravity sedimentation, the moisture content of the sludge is 93.70%, the pH is 7.5, and the total solid content MLSS in the excess sludge is determined to be 1238mg / L , TCOD is 1478mg / L, of which soluble COD is 330mg / L, TN is 5.2mg / L, and TP is 0.22mg / L.

[0050] (2) Take 5L of excess sludge that has been pretreated by gravity sedimentation and concentration and put it into an ultrasonic container, use ultrasonic waves alone to crack the excess sludge, and set the frequency of ultrasonic waves to 40kHz, power density to 0.07W / mL, and cavitation The time is 10min. At this time, the SCOD of the remaining sludge is 472mg / L, the TN is 8.1mg / L, the TP is 0.79mg / L, the sludge breakdown rate is 12.37%, and the sludge moisture content is 91.98%.

Embodiment 3

[0052] (1) After the excess sludge produced in the secondary sedimentation tank of the urban domestic sewage treatment plant is concentrated by gravity sedimentation, the moisture content of the sludge is 93.70%, the pH is 7.5, and the total solid content MLSS in the excess sludge is determined to be 1238mg / L , TCOD is 1478mg / L, of which soluble COD is 330mg / L, TN is 5.2mg / L, and TP is 0.22mg / L.

[0053] (2) Take 5L of the remaining sludge after gravity sedimentation concentration pretreatment and put it into the water inlet tank, set the swirl operating pressure of the inlet pressure gauge 5 to 0.1MPa, the ultrasonic frequency to 40kHz, and the power density to 0.07W / mL , after 5 minutes of circulating shear cracking by the hydrocyclone, the SCOD of the remaining sludge was 524mg / L, the TN was 13.7mg / L, the TP was 0.65mg / L, the sludge cracking rate was 16.89%, and the sludge moisture content was 92.78 %; Start the ultrasonic cavitation treatment again for 10 minutes. At this ...

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Abstract

The invention relates to the technical field of municipal domestic wastewater and sludge treatment and specifically discloses a combined ultrasonic whirl and disintegration process for surplus sludge.The process comprises the following steps: after carrying out gravity sedimentation and concentration on surplus sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant, disintegrating the surplus sludge under the action of a strong whirl shear flow field to form small flocs; then, realizing the crushing of microorganism cell walls under the action of ultrasonic cavitation; and releasing intercellular and extracellular polymers and intercellular organic matters into a water body to facilitate the subsequent recycle of a carbon source, so that the reduction ofthe surplus sludge is realized. By using the combined ultrasonic whirl and disintegration process, the disintegration rate of the sludge is increased, the disintegration time of the surplus sludge isshortened, the problem that the overmuch surplus sludge is difficult to treat is effectively solved, the transportation cost of the sludge is reduced, the operation costs of sludge treatment and sewage treatment are reduced as a whole, and the combined ultrasonic whirl and disintegration process has high environmental and economic benefits.

Description

technical field [0001] The invention relates to the technical field of urban domestic wastewater treatment and sludge disposal, in particular to an ultrasonic swirl combined cracking process for excess sludge. Background technique [0002] With the acceleration of my country's urbanization process and the improvement of people's living standards, the discharge of urban domestic sewage continues to increase, and the eutrophication (increased content of N and P) in domestic sewage, as well as the increasingly stringent discharge standards at home and abroad, lead to the most widely used and mature The traditional activated sludge process produces a large amount of residual sludge in the process of treating low C / N ratio sewage, which is gradually becoming an increasingly serious environmental pollution problem. According to the statistics of the Ministry of Environmental Protection, in 2015, my country's waste water discharge amounted to 73.53 billion tons, of which the urban d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12
CPCC02F11/00C02F11/12
Inventor 王勇徐银香曾涛柳忠彬张海周刘少北刘明王欢杨大志
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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