What are the requirements for the performance indicators of filter materials?-Yuanlai Water Treatment

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What are the requirements for the performance indicators of filter materials?

Released Date: Sep 14,2015 Article Source: Yuanlai Water Treatment

Filter media are the main medium for completing filtration. The performance of filter media includes the following aspects. (1) Effective particle size and non-uniformity coefficient: The specifications of filter media are commonly expressed by effective particle size and non-uniformity coefficient. Effective particle size (d10) refers to the diameter of the sieve holes through which 10% of the filter material by mass can pass, with the unit being mm. d10 reflects the particle size of the filter material and is the main part causing head loss. The non-uniformity coefficient (K80) is the ratio of d80 to d10, where d80 refers to the pore size of the sieve passing through 80% of the filter material mass. The larger the K80, the more uneven the particles will be. Small particles will fill the gaps between the particles and the trapped ones, resulting in a decrease in pore size, a reduction in dirt-holding capacity, and an increase in head loss. For single-layer quartz sand, d10=0.55mm and K < 2.0. In the double-layer filter material, the d10 of anthracite is 0.85, K90 is less than 2.0, and the d10 of quartz sand is 0

Filter media are the main medium for completing filtration. The performance of filter media includes the following aspects.

(1)Effective particle size and non-uniformity coefficient

The specifications of filter materials are commonly expressed by the effective particle size and the coefficient of non-uniformity. Effective particle sized10It refers to the ability to achieve quality10%The aperture of the sieve holes through which the filter material passes, with the unit beingmm.d10Reflecting the particle size of the filter material is the main part that causes head loss. Coefficient of non-uniformityK80Yesd80withd10The ratiod80It refers to the quality of the filter material80%The aperture of the sieve holes.K80The larger the size, the more uneven the particles. Small particles will fill the gaps between the particles and the stuck ones, reducing the pore size ratio, lowering the dirt-holding capacity, and increasing the head loss. Single-layer quartz sandd10=0.55mm,K＜2.0; Anthracite in the double-layer filter materiald10=0.85,K90＜2.0Quartz sandd10=0.55m,K80＜2.0; Homogeneous filter materiald10=0.9~1.2mm,K80＜1.4.

(2)Porosity and specific surface area

Porosity refers to the ratio of the voids between filter materials in a certain volume of filter material layer to the total volume of the filter material. Porosity is related to the shape, uniformity and compaction degree of filter material particles, etc. The surface area of filter material refers to the surface area that a unit mass or volume of filter material possesses.

The porosity of spherical filter media has little to do with particle size, generally being0.38~0.4; The porosity of irregular angular filter media depends on the particle size and its distribution, approximately0.4~0.55.A larger porosity can provide a greater dirt-holding space and a longer filtration time, but suspensions are prone to penetration. A smaller porosity will result in higher head loss and filtration efficiency.

(3)The dirt-holding capacity of the filter material

The dirt-holding capacity of the filter material layer refers to the amount of dirt that can be retained per unit volume of filter material during the filtration cycle under the condition of ensuring the quality of the effluent.

Keywords: Water Softening Equipment Automatic Water Softener Reverse Osmosis Equipment Manufacturer of Water Treatment Equipment

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