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

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...

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