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Method for pretreating sludge by high-pressure microwaves

A microwave treatment and pretreatment technology, applied in sludge treatment, water/sludge/sewage treatment, sludge treatment through temperature control, etc. Reaction efficiency and anaerobic digestion performance, increased gas production, and high degree of cracking

Active Publication Date: 2017-08-18
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the unsatisfactory effect of existing microwave pretreatment sludge, the present invention provides a new microwave sludge pretreatment method

Method used

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  • Method for pretreating sludge by high-pressure microwaves

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Effect test

Embodiment 1

[0044] For the residual sludge in the secondary sedimentation tank of a certain urban reclaimed water plant, Embodiment 1 provides a high-pressure microwave sludge pretreatment method, including the following steps:

[0045] (1) Concentrate the remaining sludge in the secondary sedimentation tank to a mud-water mixture with a concentration of 15-20g / L; add 5mol / L NaOH alkaline solution to adjust the pH to about 10;

[0046] (2) Put the sludge into the microwave reactor, turn on the microwave reactor, the frequency is 600MHz, and start the stirring device while radiating the sludge inside the device, stirring at a speed of 60rad / min, and press 10-20°C / min Heat the mud-water mixture to 80°C at the heating rate, turn off the microwave generator, temporarily stop the radiation heating, press H 2 o 2 / TS=0.2 mass ratio, add 30% hydrogen peroxide solution and stir slowly, restart the microwave generator, continue to heat the mud-water mixture at a heating rate of 10-20°C / min to 130°...

Embodiment 2

[0051] For the residual sludge in the secondary sedimentation tank of a certain urban reclaimed water plant, embodiment 2 provides a high-pressure microwave sludge pretreatment method, including the following steps:

[0052] (1) Concentrate the remaining sludge in the secondary sedimentation tank to a mud-water mixture with a concentration of 15-20g / L; add 5mol / L NaOH alkaline solution to adjust the pH to about 10;

[0053] (2) Put the sludge into the microwave reactor, turn on the microwave reactor, the frequency is 800MHz, and start the stirring device while radiating the sludge inside the device, stir at a speed of 60rad / min, and heat up at a rate of 15°C / min Heat the mud-water mixture at a high speed to 85°C, turn off the microwave generator, temporarily stop the radiation heating, press H 2 o 2 / TS=0.25 mass ratio, add 30% hydrogen peroxide solution and stir slowly, restart the microwave generator, continue to heat the mud-water mixture at a heating rate of 15°C / min to 1...

Embodiment 3

[0058] For the residual sludge in the secondary settling tank of a certain urban reclaimed water plant, embodiment 3 provides a high-pressure microwave sludge pretreatment method, including the following steps:

[0059] (1) Concentrate the remaining sludge in the secondary sedimentation tank to a mud-water mixture with a concentration of 15-20g / L; add 5mol / L NaOH alkaline solution to adjust the pH to about 10;

[0060] (2) Put the sludge into the microwave reactor, turn on the microwave reactor, the frequency is 400MHz, and start the stirring device while radiating the sludge inside the device, stir at a speed of 60rad / min, and heat up at a rate of 15°C / min Heat the mud-water mixture at a high speed to 75°C, turn off the microwave generator, temporarily stop the radiation heating, press H 2 o 2 / TS=0.15 mass ratio, add 30% hydrogen peroxide solution and stir slowly, restart the microwave generator, continue to heat the mud-water mixture at a heating rate of 15°C / min to 140°C ...

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Abstract

The invention relates to a method for pretreating sludge by high-pressure microwaves. The method comprises the following specific steps of: (1) adding monoatomic base into concentrated remaining sludge in a secondary sedimentation tank, and adjusting pH to 9-11 to obtain a sludge-water mixture; (2) stirring the sludge-water mixture obtained in the step (1), carrying out microwave treatment, when the temperature of the sludge-water mixture reaches 75-85 DEG C, temporarily stopping radiation heating, adding a hydrogen peroxide solution with the concentration of 30% according to the mass ratio of H2O2 / TS of 0.15-0.25, slowly stirring, continuously carrying out radiation heating to 130-150 DEG C, and ensuring that the pressure of microwave treatment is more than 3bar, so as to obtain sludge digestive liquid; and (3) carrying out flashing evaporation treatment on the sludge digestive liquid obtained in the step (2), so as to obtain discharged sludge. The method has the advantages that the cell lysis of the sludge can be effectively enhanced, reducing and recycling utilization of the sludge is realized, the effect is stable, and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, in particular to a method for pretreatment of high-pressure microwave sludge. Background technique [0002] At present, the commonly used sludge disposal technologies in my country include sludge incineration, sludge landfill and sludge anaerobic digestion technology. Among them, compared with the previous two technologies, the sludge anaerobic digestion technology has the advantages of saving energy, protecting the environment, generating energy gas, and low processing cost, and is favored by people. However, traditional anaerobic digestion has the disadvantages of low reaction efficiency, low sludge reduction, and long treatment cycle, mainly because the organic matter and carbon source are tightly packed and cell walled by microbial cell extracellular polymers (ESP) in the sludge. It cannot be fully released into the liquid phase to be used by methanogenic bacteria, and the amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/18
CPCC02F11/00C02F11/18C02F2303/06
Inventor 刘建伟徐享
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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