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Method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and application of method

A technology for catalytic thermal hydrolysis and sludge, applied in the direction of pyrolysis treatment of sludge, can solve the problems of low processing efficiency, high equipment cost, long time consumption, etc., and achieve the effects of improving dehydration performance, reducing cost and shortening time.

Inactive Publication Date: 2013-05-29
SHENZHEN ECO SOLUTION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a sludge treatment method with low energy consumption, short time consumption and high treatment efficiency for the defects of large energy consumption, long time consumption, low treatment efficiency and high equipment cost in the prior art. Comprehensive sludge treatment method based on low-pressure catalytic thermal hydrolysis with high cost and low equipment cost

Method used

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  • Method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and application of method
  • Method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and application of method
  • Method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and application of method

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Embodiment 1

[0035] Such as figure 2 As shown, 1 ton of sludge with a moisture content of 85-90% and 50kg of sodium carbonate is injected into the reactor, the feed port of the reactor is closed, and the stirring device in the reactor is started; from the steam boiler from the upper part of the reactor to it Inject saturated steam of 1.0-1.1MPa to heat the sludge mixed with sodium carbonate in the reactor; detect the real-time temperature of the sludge at the bottom of the reactor, and stop the injection of saturated steam when the sludge temperature reaches 170°C and keep it for 20- 25 minutes; then open the pressure relief valve to start steam and pressure relief. When the pressure in the reactor drops below 0.05MPa, open the discharge valve to discharge the mud obtained by thermal hydrolysis; the mud is cooled and undergoes anaerobic digestion to produce biogas The biogas residue produced after the biogas is produced enters the filter press, and after mechanical dehydration, a dehydrated...

Embodiment 2

[0037] Such as image 3 As shown, 1 ton of sludge with a moisture content of 80-85% and 15kg of sodium hydroxide are injected into the reactor, the feed port of the reactor is closed, and the stirring device in the reactor is started; stirring at a constant speed for 1 minute makes the sodium hydroxide and The sludge is evenly mixed; 1.1-1.2MPa saturated steam is injected into the steam boiler from the upper and lower parts of the reactor at the same time to heat the sludge mixed with sodium hydroxide in the reactor; the real-time detection of the sludge in the middle of the reactor Temperature. When the sludge temperature reaches 180°C, stop injecting saturated steam and keep it for 20-25 minutes; then open the pressure relief valve to start steam and pressure relief. When the pressure in the reactor drops below 0.05MPa, open the discharge valve. The mud obtained by thermal hydrolysis is discharged; after the mud is cooled, biogas is generated by anaerobic digestion reaction, ...

Embodiment 3

[0039] Inject 1 ton of sludge with a moisture content of 75-80% and 100 kg of potassium hydroxide into the reactor, close the reactor inlet, and start the stirring device in the reactor; stir at a constant speed for 3 minutes to mix potassium hydroxide with the sludge Uniformity; Inject 1.2-1.3MPa saturated steam from the upper part of the reactor into the steam boiler to heat the sludge mixed with potassium hydroxide in the reactor; detect the real-time temperature of the sludge in the lower part of the reactor, when the sludge temperature When it reaches 140°C, stop injecting saturated steam and keep it for 15-20 minutes; then open the pressure relief valve to start steam and pressure relief. When the pressure in the reactor drops below 0.05MPa, open the discharge valve to discharge the thermal hydrolysis treatment. After the mud is cooled, biogas is produced by anaerobic digestion reaction; the biogas residue produced during biogas production enters the filter press and is me...

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Abstract

The invention belongs to the technical field of sludge treatment, and discloses a method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and an application of the method. The method comprises the following steps of: injecting a catalyst and sludge with the water ratio of 75-90% into a reaction kettle, then injecting saturated steam with the pressure of 1.0-1.59MPa into the reaction kettle, stopping injecting the saturated steam when the temperature of the sludge reaches 60-80 DEG C, and maintaining the situation for 2 to 25 minutes, thus obtaining slurry after reaction; and performing anaerobic digestion reaction on the slurry to prepare a marsh gas. According to the method, the thermal hydrolysis time can be greatly shortened and the treatment efficiency can be improved by adding the catalyst, so that the energy consumption, the running cost, the equipment investment cost and the maintenance cost are reduced. The marsh gas prepared by the method can be used as a fuel for a steam boiler in a system or can be sold, and the purchased energy sources required by sludge treatment are reduced when the marsh gas is used as the fuel for the steam boiler in the system, so that the treatment cost is reduced, and the thorough harmlessness and recycling of the sludge are realized.

Description

Technical field [0001] The invention belongs to the technical field of sludge treatment and relates to a sludge treatment method. More specifically, the present invention relates to a sludge treatment and comprehensive utilization method based on low-pressure catalytic thermal hydrolysis and its application. Background technique [0002] Dewatered sludge is the main by-product produced in the sewage treatment process. It not only contains rich water, organic matter and microorganisms, but also contains heavy metals and other harmful substances that can cause environmental pollution. Therefore, improper sludge treatment is likely to cause two Sub-environmental pollution. In order to avoid the occurrence of the above-mentioned problems, some sludge treatment methods and devices have been developed one after another in the hope that the sludge can be properly treated to achieve reduction, harmlessness, and even resource utilization. Among them, the sludge treatment technology incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10
Inventor 黄彤宇
Owner SHENZHEN ECO SOLUTION TECH CORP
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