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

A catalytic thermal hydrolysis and sludge technology, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem that dehydrated cake cannot be directly used as biomass fuel, Problems such as high equipment cost and low treatment efficiency can achieve the effect of improving anaerobic digestion performance, dehydration performance and reducing tail gas treatment load

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

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a sludge treatment method for the defects of high energy consumption, long time consumption, low treatment efficiency, high equipment cost and the fact that the dehydrated cake cannot be directly used as biomass fuel in the prior art. A comprehensive sludge treatment method based on low-pressure catalytic thermal hydrolysis with low energy consumption, short time consumption, high treatment efficiency, low equipment cost, and dehydrated cakes that can be self-sustained for combustion and then directly used as biomass fuel

Method used

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

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Effect test

Embodiment 1

[0044] like figure 2 As shown, inject 1 ton of sludge with a water content of 85-90% and 50kg of sodium carbonate into the reactor, close the feed port of the reactor, and start the stirring device in the reactor; 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 in the lower part of the reactor, and when the temperature of the sludge reaches 170°C, stop injecting saturated steam and keep 20- 25 minutes; then open the pressure relief valve and start to exhaust 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 treatment; after the mud is cooled, carry out mechanical dehydration to obtain dehydration respectively. The dehydrated cake with liquid and water content of 45-50%; the removed liquid is further anaerobic digestion reaction to prepare biogas. At this point, the compre...

Embodiment 2

[0046] like image 3 As shown, inject 1 ton of sludge with a water content of 80-85% and 15kg of sodium hydroxide into the reactor, close the feed port of the reactor, and start the stirring device in the reactor; stir at a constant speed for 1 minute to make the sodium hydroxide and The sludge is mixed evenly; the saturated steam of 1.1-1.2MPa is injected into the reactor from the upper and lower parts of the reactor at the same time, and the sludge mixed with sodium hydroxide in the reactor is heated; the sludge in the middle of the reactor is detected in real time When the sludge temperature reaches 180°C, stop injecting saturated steam and keep it for 15-20 minutes; then open the pressure relief valve to start exhausting and pressure relief, and open the discharge valve when the pressure in the reactor drops below 0.05MPa. Discharge the mud obtained from the thermal hydrolysis treatment; mechanically dehydrate the mud after cooling to obtain the dehydrated liquid and dehyd...

Embodiment 3

[0048] Inject 1 ton of sludge with a moisture content of 75-80% and 20kg of potassium hydroxide into the reactor, close the feed port of the reactor, and start the stirring device in the reactor; stir at a constant speed for 3 minutes to mix potassium hydroxide with the sludge Uniform; inject saturated steam of 1.2-1.3MPa from the steam boiler from the upper part of the reactor 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, and when the pressure in the reactor drops below 0.05MPa, open the discharge valve and discharge the thermal hydrolysis treatment to obtain The mud; after the mud is cooled, it is mechanically dehydrated to obtain the dewatered cake with a water content of 40-45% respectively; ...

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Abstract

The invention belongs to the technical field of sludge treatment, and discloses a method for treatment and resource 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 content of 75-90% into a reaction kettle, then injecting saturated steam with the pressure of 1.0-1.59MPa into the reaction kettle, and heating the sludge mixed with the catalyst, thus obtaining slurry after reaction; performing mechanical dehydration on the slurry to obtain removing liquid and dehydrated mud cakes; and performing anaerobic digestion reaction on the removing liquid to prepare a marsh gas. According to the method, the treatment time can be greatly shortened and the treatment efficiency can be improved by adding the catalyst, and the energy consumption and the running and investment costs are reduced at the same time. The marsh gas prepared by the method can be used as a fuel for a steam boiler in a system or can be sold; the dehydrated mud cakes can be prepared into a biomass fuel which can be used by boilers in the system or can be sold; and meanwhile, the mud cakes can also be used as an organic fertilizer raw material sold to fertilizer plants, so that 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 resource 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 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, the sludge treatment technolo...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/10C02F11/12C02F3/28B09B3/00C10L5/46C12P5/02
CPCY02E50/30Y02E50/10Y02W10/10
Inventor 黄彤宇
Owner SHENZHEN ECO SOLUTION TECH CORP
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