Combined ultra-filtration device with membrane pollution control and ultrasonic cleaning functions

Abstract

The invention discloses a combined ultra-filtration device with membrane pollution control and ultrasonic cleaning functions. The device mainly comprises an ultra-filtration system, a blowing aeration system, an ultrasonic cleaning system, a pressurized dissolved air backwashing system and a programmable logic controller (PLC) system, wherein the ultra-filtration system consists of an ultra-filtration tank body and an ultra-filtration membrane assembly; the blowing aeration system consists of a blower and an aeration diffusion device; the ultrasonic cleaning system consists of an ultrasonic generator and a transducer; the pressurized dissolved air backwashing system consists of an air compressor, a pressurizing water pump and a dissolved air tank; and the PLC system consists of a PLC cabinet and a control microcomputer. By adopting a combined cleaning strategy, membrane pollution in the ultra-filtration process is well controlled, particularly pollutants can be effectively removed by using pressurized dissolved air backwashing, and the frequency of chemical cleaning is reduced; and by adopting the automatic PLC system, the device has the advantages of low running cost, long membrane service life and convenience in operation.

Description

technical field [0001] The invention belongs to the field of water treatment devices, and relates to an ultrafiltration device suitable for source water or tap water, in particular to a combined ultrafiltration device with membrane pollution control and ultrasonic cleaning. Background technique [0002] Organic pollutants in water sources, especially trace organic substances that are difficult to remove by conventional treatment, will affect human health. In order to solve the harm of drinking water to human health, various water treatment devices and technologies are widely used in the advanced treatment of drinking water. [0003] Ultrafiltration (abbreviation: UF) is a green physical separation technology that uses microporous filtration membranes with a pore size range of 0.001 to 0.02 microns to purify water. Ultrafiltration can retain bacteria and has excellent turbidity removal and bactericidal effects. It has been widely used in water purification treatment. Howeve...

AI Technical Summary

Problems solved by technology

[0006] When the backwash water in the pressurized dissolved air backwash passes through the pores of the ultrafiltration membrane, the pressure on both sides of the membrane will change. The usual ultrafiltration membrane backwash only uses filtered water, but when the backwash water contains high pressure After the gas is dissolved, the dissolved gas in the water will gradually dissolve to form tiny bubbles as the pressure drops when passing through the membrane pores, and the bubbles will continue to expand. At the same time, the pollutants in the membrane pores will be squeezed out by the bubbles. When the bubbles pass through the membrane pores Due to the large pressure difference between the two sides of the ultrafiltration membrane, the bubbles collapse instantly, releasing energy to peel off the pollutants on the membrane surface

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