What is the difference between a self-cleaning filter and a backwashing filter

In the water treatment industry, self-cleaning filter and backwash filter are used for water treatment, but many customers are often confused between the two. Below we are on the self cleaning filter and backwash filter what is the difference, so that everyone reference.

Filtering works differently

AFM internal scraping type self-cleaning filter filtering principle:

The liquid flows in from the inlet, the scraper with compensation is close to the inner surface of the filter screen, the liquid flows outward from the inner surface of the filter element through the filter screen, the impurities are intercepted on the inner surface, and the liquid flows out from the outlet; With the passage of time, the impurities gradually increase, the pressure difference rises, according to the set pressure difference or timing cleaning filter. The motor drives the scraper to clean the filter screen in horizontal rotation motion. When the scraper rotates, the impurities are removed by the scraper and flow to the bottom of the filter screen, and the large proportion of impurities precipitate to the fouling chamber. Each cleaning is composed of several strokes. After cleaning the screen surface, the filtration capacity is restored. Normal filtration during cleaning, flow is not interrupted. After several cleaning cycles, impurities accumulate to a certain amount, open the blowdown valve regularly, discharge the waste liquid containing high concentration of impurities, if necessary, can also be recycled.

AR backwash filter filtering principle:

Liquid from the filter inlet into the filter, part of the liquid directly from the lower end of the filter element into the filter, the other part from the middle shunt pipe into the top of the filter, and then from the upper end of the filter screen into the liquid from the upper and lower openings of the filter screen at the same time, through the inner surface of the filter screen at the outlet. Particle impurities are intercepted on the inner surface of the filter screen and accumulate into filter cake, making the pressure difference between the inlet and outlet gradually larger, indicating that the filter cake reaches a certain thickness, and the filter flux decreases gradually. When the set pressure difference or time is reached, the self-cleaning action starts, the speed reducer motor drives the backwashing rotor to alignment with one or a group of filter screen, the upper end of the filter screen is sealed, the lower end is connected to the cleaning nozzle, the backwashing valve is opened, the filter screen and the sewage pipe are connected, the pressure difference between the outside of the filter screen and the sewage outlet drives the filter liquid reverse flow to wash the filter cake on the inner surface of the filter screen and discharge into the sewage pipe. After the backwashing of one filter element/group is completed, close the backwashing valve and align the cleaning boom with the next filter element/group for backwashing. After all screens are backwashed one by one, the whole process is complete.

The filter liquid is different

AFM internal scraping type self-cleaning filter can be applied to a variety of liquids, such as: water, resin, paint, polymer, adhesive, citric acid, fermentation liquid, chitosan, cosmetics, agarose (gel), silicone solution, soap, sorbitol, steroids, cereal syrup, wet part additives, pigments, lubricants, rubber, ethanol, mixed oil, cooking oil high temperature oil, juice, diesel, etc.

AR self-cleaning filter can not adapt to high viscosity liquid, only suitable for water filtration, such as groundwater, seawater, lake water, reservoir water, circulating cooling water, frozen water, spray water, heat exchange water, sealing water, bearing cooling water, oil well injection, process circulating water, machining coolant, cleaning water, etc.

To sum up, AFM internal scraping type self-cleaning filter than AR self-cleaning filter application range is wider, it can be said that can be used to AR self-cleaning filter, AFM internal scraping type self-cleaning filter. But the use of AFM internal scraping filter, but not necessarily suitable for AR backwash filter.

The above is a simple description of the difference between the self-cleaning filter and the backwashing filter. If you have other things you want to know, you can consult Henan Aite Environmental Protection Equipment Co., LTD. The company is focused on R & D, production and manufacture of replacement imported filter element, filter, oil filter and other oil purification products, sewage treatment products, air dust removal products, pure water treatment products, filter press products.