The principle and characteristics of the multi-media filter are introduced:

Multi-media filter is a bed of layered anthracite, sand, finely divided garnet or other materials, a typical multi-media filter.

The equipment is pressure type. The principle is that when the raw water passes through the filter material from top to bottom, the suspended solids in the water are trapped by the surface of the filter layer due to adsorption and mechanical resistance; The sand particles in the water are arranged more closely, so that the particles in the water have more opportunities to collide with the sand particles, so the flocs, suspended solids and the surface of the sand particles in the water adhere to each other, and the impurities in the water are trapped in the filter material layer, thereby obtaining clarified water quality. The filtered effluent suspension can be below 5 mg/L.

 Features

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 advanced water quality treatment.

2. Multi-media filter is a commonly used pretreatment device for deep water purification, and different filter materials can be added according to process requirements.

3. The material of the multi-media filter can be made of glass fiber reinforced plastic, A3 steel anti-corrosion or rubber-lined, all stainless steel. There are two modes of operation, automatic and manual. The automatic control adopts the automatic controller imported from the United States and the control of pneumatic and hydraulic valves. It is easy to operate and easy to maintain. It is widely used in the pre-treatment devices of water treatment processes in all walks of life. .

4. The filter material of the multi-media filter should have sufficient chemical stability, and the relative density and particle size of each medium should be different to a certain extent. The relative density of anthracite used in the double-layer filter material filter composed of anthracite and quartz sand is 1.4 -1.6, the particle size is 0.8-1.8mm, the relative density of quartz sand is 2.6-2.65, and the particle size is 0.5-1.2mm; the 3-layer filter material filter can also use manganese sand and magnetite in addition to the above two filter materials. Such heavy ores have a relative density of 4.7-5.0 and a particle size of 0.5-4mm.

The working principle of quartz sand filter

Quartz sand filter uses quartz sand as a filter medium. Under a certain pressure, the water with high turbidity is filtered through a certain thickness of granular or non-granular quartz sand, which can effectively intercept and remove suspended solids, organic matter, Colloidal particles, microorganisms, chlorine, smell and some heavy metal ions, etc., and finally achieve a high-efficiency filtration device that reduces water turbidity and purifies water quality.

Quartz sand filter is generally used as the pretreatment of reverse osmosis equipment and ultrafiltration equipment, mainly to intercept and adsorb sediment, colloid, metal ions and organic matter. Commonly used filter materials are quartz sand, activated carbon, anthracite, manganese sand, etc.

working principle

Quartz sand filter uses one or several filter media, operates at room temperature, is resistant to acid and alkali, oxidation, and has a pH range of 2-13. The system is equipped with complete protection devices and monitoring instruments, and has the function of backwashing. The dirt and other pollutants are quickly washed away, and the water consumption is small. The automatic function can be set according to user requirements. Under a certain pressure, the raw liquid is flocculated, adsorbed and retained through the medium to remove impurities, so as to achieve the purpose of filtration. The built-in fillers are generally: quartz sand, anthracite, granular porous ceramics, manganese sand, etc., users can choose to use according to the actual situation.

Features

1. Compact structure: the equipment integrates coagulation reaction, filtration and continuous cleaning. The water treatment process is simplified, the floor space is small, the structure is simple, and the installation and operation are flexible and convenient. It reduces the energy consumption and labor management costs of multiple links in the raw water treatment process, and reduces the difficulty of operation.

2. The coagulation reaction effect is obvious: the application of the coagulation reaction mechanism and the sedimentation mechanism can effectively remove the suspended solids and colloidal substances in the water, which is beneficial to further reduce the turbidity of the callus effluent in the sand filter area.

3. Continuous self-cleaning filtration: The filter medium is automatically circulated and cleaned continuously, and there is no need to stop the machine for backwashing.

4. Reduce the suspended solids (SS) content of raw water: with the micro-flocculation device, all kinds of industrial water, urban domestic sewage and industrial water with SS≤mg/L in the influent water are used as reuse water, and the removal rate is ≥90% to achieve perfect filtration effect. .

5. Selected material, long service life.