Cavitation and microwave coupled device for sludge pretreatment

Abstract

The invention discloses a cavitation and microwave coupled device for sludge pretreatment. The device comprises a stator, a rotor, a rotating shaft and an ultrasonic transducer, the stator is a sealed cylinder, a liquid outlet and a liquid inlet are formed in the two sides of the stator respectively, the ultrasonic transducer is distributed on the inner wall of the stator, a microwave emitter is arranged on the side face of the stator, the rotating shaft is installed in the stator, the rotor is located in the stator and installed on the rotating shaft, blades are distributed on the rotor, cavities are formed in the blades, and cavitation through holes are formed in the blades and located on the two opposite sides of the cavities. Sludge needing to be treated and an aqueous solution are mixed and fed into the device, the sludge is treated through efficient coupling of hydrodynamic cavitation, ultrasonic cavitation and a microwave technology, the sludge disintegration pretreatment process is achieved, and finally a needed product is obtained. The device is good in effect, large in treatment capacity, low in cost, capable of continuously operating, free of secondary pollution and wide in application prospect in the field of sludge disintegration.

Description

technical field [0001] The invention relates to a device for pretreating sludge. The device is coupled with hydraulic cavitation, ultrasonic cavitation and microwave technology, and belongs to the field of sludge cracking. Background technique [0002] In the process of sewage treatment, the amount of sludge produced accounts for 1% to 2% of the volume of treated sewage. If advanced treatment is carried out, the output of sludge will be doubled. These sludges contain a large number of microorganisms, and the microbial cytoplasm is rich in organic matter, but the microbial cytoplasm is wrapped by the cell wall. If the organic matter in the sludge is to be fully utilized, the sludge must be pretreated to destroy the microbial cell wall and dissolve the organic matter. out. At present, sludge cracking can be achieved through ultrasonic, thermal hydrolysis, Fenton oxidation, ozone oxidation and their combination. Using hydraulic cavitation technology to pretreat sludge is a si...

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Problems solved by technology

[0003] At present, there are some cavitation researches aimed at sludge cracking, such as: "A Cycling-type Congested Cavitator for Cracking Excess Sludge" published by CN102491485A. It is relatively low, and the treatment effect on sludge cracking is poor, and the effect of industrialized large-scale utilization cannot be achieved; the cavitation equipment used in "A Combined Cracking Process of Excess Sludge Ultrasonic Cycling" disclosed by CN108046550A is ultrasonic cavitation equipment, and the energy consumption Higher and its effect on sludge cracking is relatively poor compared with hydraulic cavitation technology; CN210711199U disclosed "a kind of sludge cracking device based on fluid shearing-ultrasonic method" adopts the mode of ultrasonic cavitation and fluid shearing to sludge However, there is no cavitation hole on the rotor, which does not belong to hydraulic cavitation technology, and its pure shear cracking effect is worse than that of hydraulic cavitation equipment.

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