Sludge treatment and resource utilization method based on pyrohydrolysis and application thereof

A thermal hydrolysis and sludge technology, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc. Short time, low equipment cost and other problems, to achieve the effect of improving anaerobic digestion performance, realizing heat balance and saving equipment cost

Active Publication Date: 2013-06-05
SHENZHEN ECO SOLUTION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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 thermal hydrolysis with low energy consumption, short time consumption, high treatment efficiency, low equipment cost and maximum utilization of sludge resources

Method used

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  • Sludge treatment and resource utilization method based on pyrohydrolysis and application thereof
  • Sludge treatment and resource utilization method based on pyrohydrolysis and application thereof
  • Sludge treatment and resource utilization method based on pyrohydrolysis and application thereof

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Effect test

Embodiment 1

[0038] Such as figure 2 As shown, inject the sludge with a moisture content of 75-80% into the reactor, close the feed port of the reactor, and start the stirring device in the reactor; inject 1.5-1.7MPa sludge from the upper part of the reactor from the steam boiler Saturated steam to heat the sludge 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 185°C, stop injecting saturated steam and keep it for 5-10 minutes; then open the pressure relief valve and start to discharge Steam 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, it enters the filter press for mechanical dehydration, and the removal liquid and water content are respectively obtained 45-50% dehydrated cake; the dewatered liquid is further anaerobically digested to produce biogas. At this p...

Embodiment 2

[0040] Such as image 3 As shown, inject the sludge with a moisture content of 80-85% into the reactor, close the feed port of the reactor, and start the stirring device in the reactor; inject 1.8-2.0MPa sludge from the upper part of the reactor from the steam boiler Saturated steam to heat the sludge 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 it for 15-20 minutes; then open the pressure relief valve to start discharging Steam 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, it enters the filter press for mechanical dehydration, and the removal liquid and water content are respectively obtained 40-45% dehydrated cake; the removal liquid is further subjected to anaerobic digestion to generate biogas,...

Embodiment 3

[0042] Inject the sludge with a moisture content of 85-90% into the reactor, start the stirring device in the reactor at the same time, close the feed port of the reactor; inject 2.1-2.3MPa sludge from the upper and lower parts of the reactor at the same time from the steam boiler Saturated steam to heat the sludge in the reactor; detect the real-time temperature of the sludge in the middle of the reactor, when the temperature of the sludge reaches 165°C, stop injecting saturated steam and keep it for 0-5 minutes; then open the pressure relief valve to start discharging Steam 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, it enters the filter press for mechanical dehydration, and the removal liquid and water content are respectively obtained 43-48% dehydrated cake; the removal liquid further enters the anaerobic digestion equipment, and genera...

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Abstract

The invention belongs to the technical field of sludge treatment, and discloses a sludge treatment and resource utilization method based on pyrohydrolysis and application of the sludge treatment and resource utilization method based on the pyrohydrolysis. The sludge treatment and resource utilization method based on the pyrohydrolysis comprises injecting sludge with moisture content of 75%-90% into a reaction kettle, then injecting saturated steam with pressure of 1.5MPa-2.5MPa into the reaction kettle, stopping injecting the saturated steam when the temperature of the sludge reaches 150DEG C-185DEG C, maintaining the state for 0-25min, and obtaining slurry of the pyrohydrolysis; carrying out mechanical dehydration on the slurry, and obtaining desorption liquid and dehydration mud cakes; and carrying out an anaerobic digestion reaction on the desorption liquid, and obtaining methane. Processing temperature of the pyrohydrolysis is low, heating time of the sludge and total processing time of the sludge treatment and resource utilization method can remarkably reduced, processing efficiency is improved, energy consumption is reduced, and cost is saved. The dehydration mud cakes obtained by the sludge treatment and resource utilization method can serve as raw materials of organic fertilizer, the obtained methane can be used for fuel of a boiler system, and finally reduction, harmless performance and recycling of the sludge are achieved.

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 thermal hydrolysis-based sludge treatment and resource utilization 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, the sludge treatment technology including thermal hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/12C02F3/28C12P5/02B09B3/00C10L5/46C05F7/00
CPCY02E50/30Y02E50/10Y02W10/10Y02W30/40Y02P20/54Y02A40/20
Inventor 黄彤宇
Owner SHENZHEN ECO SOLUTION TECH CORP
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