Polluted and waste water front-end physical treatment method

Abstract

The invention relates to a polluted and waste water front-end physical processing method for removing solid impurities from water. The method uses a filtering and cleaning device, which comprises a filter strip, a water absorption roller, a pressing roller, a scraper, an air knife and an ultrasonic cleaning apparatus. The method comprises the following steps: first, separating solid impurities from water using the interception function of the filter strip; and then stripping water and suspension impurities intercepted on the surface and in clearances of the filter strip off the filter strip through absorption by the water absorption roller, squeezing by the pressing roller, scratching by the surface of the scraper, high speed air curtain blowing generated by the air knife, and ultrasonic cleaning by the ultrasonic cleaning device, thus realizing the clean filter strip, and at the same time effectively controlling water in the discharged slag, facilitating subsequent processing after discharging the slag, and maintaining good environmental sanitation condition.

Description

technical field [0001] The invention relates to water purification of sewage and wastewater, in particular to a front-end physical treatment method of sewage and wastewater for removing solid impurities in water, belonging to the field of sewage treatment. Background technique [0002] Sewage and wastewater treatment generally requires front-end physical treatment to remove most of the insoluble solid impurities, so as to facilitate subsequent various treatments such as biological treatment. [0003] In the existing sewage and wastewater front-end treatment technology, generally, the grille is the most commonly used front-end treatment device. It uses the principle of filtration and retention to remove large particles of insoluble solid impurities in the water body, and then passes through the grit chamber to The principle of sedimentation separation realizes the removal of small particles of insoluble solid impurities that are heavier than water in the water body. [0004]...

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Problems solved by technology

But this device still has multiple defects: 1, the air blowing device can not completely blow out the residue in the filter belt; 2, due to the implementation of water spray, all these waters enter the residue, resulting in a very high slag yield, Greatly increased the difficulty and cost of post-treatment; 3. Even if air purging and water spraying treatment were carried out, these oil stains and filter belts have very strong adhesion, and at the same time they are not soluble in the sprayed water from the water spray pipe. As a result, a large amount of oil remaining in the filter belt has not been removed substantially, which makes the pores of the filter belt gradually blocked, resulting in a gradual decrease in filtration capacity, which seriously affects the filtration capacity and efficiency of the filter belt.

However, the structure of the device is complicated, the filter belt needs to be specially set on the conveyor belt, and a series of means and additional devices such as clamping rails, tight covering belts, etc. are needed for tight pressing, and a soft elastic pressure lip is needed to press the tight cover band

In addition to the complex structure, it still has the following defects in terms of cleaning effect: 1. The air blowing device cannot completely clean the residue in the filter belt; 2. Due to the implementation of water spray, all the water enters the residue 3. Even if air purging and water spraying treatment are carried out, these oil stains and filter belts have very strong adhesion, and at the same time, they do not It is insoluble in the water sprayed by the water spray pipe, so a large amount of oil stains remaining in the filter belt cannot be removed substantially, which makes the pores of the filter belt gradually blocked, resulting in a gradual decrease in filtration capacity, which seriously affects the filtration of the filter belt capacity and efficiency

[0021] In fact, although the above technologies are constantly improving, due to the limitations of each technology, the problem of cleaning the interception surface has not been well solved, especially for the continuous removal of water in the filter belt during the filtration process, the filter belt There has been no effective cleaning technology for the cleaning of adhesive oil stains in gaps or inside, which has become the main reason for the general application effect of interception technology in the physical process of water purification.

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