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Low-pressure catalytic thermal-hydrolysis sludge treatment method and application thereof

A technology of catalytic thermal hydrolysis and treatment method, applied in the field of sludge treatment, can solve the problems of high operating cost and investment cost, strict equipment requirements, low treatment efficiency, etc., achieve energy consumption and equipment requirements control, improve dehydration performance, Effect of exhaust gas treatment load reduction

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

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an energy-consumption A sludge low-pressure catalytic thermal hydrolysis treatment method that is small in size, high in treatment efficiency, and can be realized by using low-cost low-pressure equipment

Method used

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  • Low-pressure catalytic thermal-hydrolysis sludge treatment method and application thereof

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Effect test

Embodiment 1

[0029] Inject 50kg of sodium carbonate and 1 ton of sludge with a water content of 90-97% into the reactor, close the feed port of the reactor, and start the stirring device in the reactor; inject 0.5-0.8MPa of Saturated steam, heat the sludge mixed with sodium carbonate in the reactor; detect the real-time temperature of the sludge in the lower part of the reactor, when the temperature of the sludge reaches 140°C, stop injecting saturated steam and keep it for 20-25 minutes; then open the drain The pressure valve starts to exhaust steam and relieve pressure. When the pressure in the reactor drops below 0.05MPa, the discharge valve is opened to discharge the mud obtained by thermal hydrolysis treatment. At this point, the low-pressure catalytic thermal hydrolysis treatment of the sludge with a water content of 90-97% is completed.

[0030]After the discharged mud is cooled, it is dehydrated to obtain a dewatered liquid and a dewatered cake with a water content of 55-60%.

Embodiment 2

[0032] Inject 30kg of sodium hydroxide and 1 ton of sludge with a water content of 85-89% into the reactor, close the feed port of the reactor, and start the stirring device in the reactor, stirring at a constant speed for 1 minute to mix the sodium hydroxide with the sludge Uniform; inject saturated steam of 0.9-1.1MPa from the upper and lower parts of the reactor to heat the sludge mixed with sodium hydroxide in the reactor; detect the real-time temperature of the sludge in the middle of the reactor, when the sludge temperature reaches 160°C , stop injecting saturated steam and keep it for 15-20 minutes; then open the pressure relief valve to start steam and pressure relief, and when the pressure in the reactor drops below 0.05MPa, open the discharge valve to discharge the mud obtained by thermal hydrolysis treatment. At this point, the low-pressure catalytic thermal hydrolysis treatment of the sludge with a water content of 85-89% is completed.

[0033] After the discharged...

Embodiment 3

[0035] Inject 5kg of calcium hydroxide, 30kg of potassium hydroxide and 1 ton of sludge with a water content of 80-85% into the reactor, close the feed port of the reactor, start the stirring device in the reactor, and stir at a constant speed for 3 minutes to make the hydrogen Calcium oxide and potassium hydroxide are mixed evenly with the sludge; at the same time, 1.2-1.4MPa saturated steam is injected from the upper and lower parts of the reactor to heat the sludge mixed with calcium hydroxide and potassium hydroxide in the reactor; The real-time temperature of the sludge in the middle of the kettle. When the temperature of the sludge reaches 130°C, stop injecting saturated steam and keep it for 10-15 minutes; then open the pressure relief valve to start exhausting steam and pressure relief. When the pressure in the reactor drops below 0.05MPa Open the discharge valve at the same time to discharge the mud obtained by thermal hydrolysis treatment. At this point, the low-pres...

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Abstract

The invention belongs to the technical field of sludge treatment and discloses a low-pressure catalytic thermal-hydrolysis sludge treatment method and application thereof. The low-pressure catalytic thermal-hydrolysis sludge treatment method comprises the following steps of: S1, pouring the sludge and a catalyst to a reaction kettle; S2, pouring saturated vapor of 0.5MPa-1.5MPa to the reaction kettle, stopping the pouring of the saturated vapor and keeping the status for 0-25 minutes to obtain thermally hydrolyzed slurry when the temperature of the sludge reaches 80 DEG C to 180 DEG C. The low-pressure catalytic thermal-hydrolysis sludge treatment method has the beneficial effects that the sludge hydrolysis efficiency is improved by adopting the method of adding the catalyst to the sludge, so that the sludge cells are quickly crushed and the organic substances are quickly hydrolyzed in the presence of the catalyst under the heating condition. The sludge hydrolysis efficiency is improved by adding the catalyst to the sludge, so the saturated vapor of 0.5 MPa-1.5MPa can be poured to the reaction kettle; the saturated vapor pressure is reduced, so that the investment cost is greatly reduced due to the designed pressure drop of the reaction kettle; and moreover, the investment of the supporting devices such as a boiler is greatly reduced under the saturated vapor pressure. Besides, the energy consumption is reduced due to the dosage drop of the vapor, so that the operation cost for sludge treatment is greatly reduced.

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 low-pressure catalytic thermal hydrolysis treatment method 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 many harmful substances such as heavy metals that can cause environmental pollution. Therefore, improper treatment of sludge is likely to cause secondary pollution. secondary environmental pollution. In order to avoid the occurrence of the above problems, some sludge treatment methods and devices have been developed successively, in order to reduce the content of harmful substances in the sludge and to recycle it through sludge treatment. Among them, thermal hydrolysis treatment of sludge is an effective means of...

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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