Spiral-flow type jammed cavitation device for breaking excess sludge

Abstract

The invention relates to a hydrodynamic cavitation sludge breaking device. A spiral-flow type jammed cavitation device for breaking excess sludge is characterized by comprising a spiral-flow body, a spiral-flow core, a jammed body and a backpressure cover. The spiral-flow body and the spiral-flow core are matched to form a spiral-flow nozzle. A through hole in the jammed body forms a jammed pipe. The jammed body and the backpressure cover are matched to form a collapse cavity. A backpressure hole is formed in the backpressure cover in the radial direction. After fluid enters the spiral-flow nozzle through the spiral-flow body, flows along a spiral channel to possess the tangential speed and the radial speed, and forms rotating jet flow when being ejected through an outlet end, the rotating jet flow is induced on the upstream of the jammed pipe to generate a large number of cavitation bubbles and an acute shear effect, cavitation bubbles carried by the fluid collapse when the fluid passes through the jammed section on the downstream of the jammed pipe to form jammed cavitation, and when the cavitation bubbles collapse, the mechanical effect of formed micro jet and the like effectively promotes breaking of the excess sludge. Compared with the prior art, the spiral-flow type jammed cavitation device is simple in structure, high in cavitaion strength, strong in mechanical shear force action, high in excess sludge breaking rate and the like.

Description

technical field [0001] The invention relates to the fields of sewage treatment and sludge cracking, and specifically provides a swirl-type clogged cavitator for cracking excess sludge. Background technique [0002] At present, nearly 90% of urban sewage treatment plants in the world use biological treatment processes. Since the biological treatment process was applied to sewage treatment in the early 20th century, it has become the most widely used treatment process in the world, but one of the main weaknesses of this method is that it produces a large amount of residual sludge. The cost of excess sludge treatment is high, accounting for about 25% to 40% of the total operating cost of the sewage treatment plant, and sometimes even as high as 60%. The flocs and bacterial cell walls in the sludge are decomposed slowly in the anaerobic fermentation environment, which hinders the effective degradation of intracellular organic matter, which is the obstacle of the traditional bio...

AI Technical Summary

Problems solved by technology

The design of the swirling choked cavitator is based on the choked cavitation theory and the swirling jet theory. By designing a specific cavitator structure, the cavitation can be effectively collapsed and more cavitation can be induced by using the swirl nozzle. , which greatly improves the ability and efficiency of the cavitation effect and the mechanical shear force effect to synergistically break down the excess sludge, and at the same time solves the problem that the annular clogged cavitator is easy to block, so that the hydraulic cavitation technology is moving towards industrial applications. another big step on the road

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