Large multi-media filter

A large multi-media filter is a process that uses two or more filtering media to pass water with high turbidity through a certain thickness of granular or non granular materials under a certain pressure, effectively removing suspended impurities and clarifying water. Commonly used filter media include quartz sand, anthracite, manganese sand, etc., mainly used for water treatment turbidity removal, softening water, and pre-treatment of pure water. The effluent turbidity can reach below 3 degrees Celsius

　　Large multi-media filterIt is an efficient water treatment equipment that uses a variety of filter media with different particle sizes and densities to remove suspended solids, colloids, organic matter, rust, and other impurities, as well as microorganisms, from water through physical and chemical reactions. This type of filter is typically used to treat large amounts of water flow, such as industrial wastewater, drinking water, swimming pool water, etc.

Water gradually removes pollutants from water through the action of multiple filtering media, utilizing the different molecular sieve effects and chemical adsorption of different filtering media. There are various types of filter media, including quartz sand, activated carbon, fiber balls, silica sand, ceramic particles, etc. These media have different particle sizes and densities, forming a hierarchical structure for filtration, allowing water to enter the filter and undergo multiple layers of filtration.

It mainly consists of a filter body, supporting pipelines, and valves, usually including tank body, water distribution components, support components, backwash air pipe, filter material, exhaust valve and other components. This type of filter has the characteristics of being able to withstand high filtration pressure, having a deep mesh structure that enables the filter element to have high pollutant holding capacity, small external volume, large filtration area, low resistance, and long service life.

　　Large multi-media filterThe functional characteristics of：

1. Porous media filters are widely used in water treatment processes and can be used alone, but most of them are used as pre filtration for water quality deep treatment (exchange resin, electrodialysis, reverse osmosis).

2. Multi media filter is a commonly used pre-treatment device for deep water purification, which can be filled with different filter materials according to process requirements.

3. The material of the multi-media filter can be fiberglass, A3 steel anti-corrosion or rubber lined, or all stainless steel. There are two types of operation modes: fully automatic and manual. Automatic control adopts automatic controllers and pneumatic and hydraulic valves imported from the United States. It is easy to operate and maintain, and has been widely used in pre-treatment devices of water treatment processes in various industries.

4. The filter material of a multi-media filter (including a dual filter material filter) should have sufficient chemical stability, and the relative density and particle size of each medium should have certain differences. The double-layer filter material composed of anthracite and quartz sand uses anthracite with a relative density of 1.4-1.6 and a particle size of 0.8-1.8mm, and quartz sand with a relative density of 2.6-2.65 and a particle size of 0.5-1.2mm. In addition to the above two types of filter materials, the 3-layer filter material can also use heavy ores such as manganese sand and magnetite with a relative density of 4.7-5.0 and a particle size of 0.5-4mm.

(1) Must have sufficient mechanical strength to prevent rapid wear and breakage during backwashing process;

(2) Good chemical stability;

(3) Does not contain harmful or toxic substances to human health, and does not contain substances that are harmful or affect production;

(4) The selection of filter materials should preferably use those with high adsorption capacity, high interception capacity, high water production, and good effluent quality.

In the filter material, pebbles mainly play a supporting role. During the filtration process, due to their high strength, stable spacing and large pores, they facilitate the smooth passage of filtered water in the washing process; Similarly, in the backwashing process, backwashing water and backwashing air can pass smoothly.

　　Large multi-media filter