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Gradation parameters of filter material of high speed filter
Sep 14, 2018

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1. Gradation of filter material for high speed filter

The first layer of filter material: Pebble Phi 4-8 layer height: 200mm

Second layers of filter material: quartz sand 1.8 mm high 1200mm

Third layers of filter material: anthracite, 4 800mm:

2.anthracite filter parameters: (reference filter material national standard)

A. The sum of crushing rate and wear rate of anthracite filter media should not be more than 3% (the same as below).

The average density of B and anthracite filter material is generally not less than 1.4g/cm3, not more than 1.6g/cm3. Exceptions are required for average density in use.

C. Anthracite filter media should not contain visible clay, shale and foreign debris, and the leaching solution of the filter media should not contain toxic substances. Mud content should not exceed 4%. The content of substance with a density greater than 1.8g/cm3 should not exceed 8%.

The solubility of D and anthracite filter material should not exceed 3.5%.

Particle size of E and anthracite filter media

The particle size of anthracite used as a double-layer filter is 0.8 to 1.8mm.

The size range of anthracite used as the three layer filter material is 0.8 ~ 1.6mm.

F. Among the anthracite filter media with various size ranges, the size of anthracite filter media smaller than the specified lower limit should not be greater than 3%, and the size larger than the specified upper limit should not be greater than 2%.

The effective particle size and non-uniformity coefficient of G and anthracite filter material are determined by the users.

3. quartz sand filter parameters (reference filter national standard)

The sum of fragmentation rate and wear rate of quartz sand filter media should not be 1.5% (the percentage is the same as that by mass).

The density of B and quartz sand filter material should not be less than 2.55g/cm3.

C. Quartz sand filter media should not contain visible clay, mica and organic impurities, water leaching media should not contain toxic substances, the content of mud should not exceed 1%. The content of light substance with a density of less than 2g/cm3 should not be greater than 0.2%.

The burn loss of D and quartz sand filter material should not exceed 0.7%.

The hydrochloric acid solubility of E and quartz sand filter material should not exceed 3.5%.

Particle size of F and quartz sand filter media

The size of quartz sand filter material in single or double layer filter media is generally 0.5 to 1.2mm.

The size range of quartz sand filter material in the three layer filter media is generally 0.5 to 0.8mm.

G. Among the quartz sand filters with various sizes, the sizes smaller than the specified lower limit should not be greater than 3%, and the sizes larger than the specified upper limit should not be greater than 2%.

4. Gravel bearing parameters (reference filter national standard)

The density of A and gravel bearing materials should not be less than 2.5g/cm3.

B. The gravel bearing material should not contain visible clay, shale and organic impurities, and the water leaching wave of the bearing material should not contain toxic substances.

Mud content should not exceed 1%.

The hydrochloric acid solubility of C and gravel bearing materials should not exceed 5%.

Particle size of D and gravel bearing material

The particle size range of gravel support for single or double layer filter media.

Generally 2~4, 4~8, 8~16, 16~32 and 32 ~ 64mm.

In gravel bearing materials with various material diameters, the particle size below the specified lower limit should not exceed 5%.

Larger than specified upper diameter should not exceed 5%.

 

More inquiries pl contact 

KHN water treatment equipments Co., Ltd.                             www.khnwatertreatment.com

 


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