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Fibrous filtering material for water treatment

A fiber filtration and water treatment technology, applied in the fields of suspended impurities and filter materials, can solve the problems of difficult cleaning, low retention efficiency, and large residual sludge in the filter bed, so as to improve backwashing efficiency and reduce backwashing water consumption. , The effect of high solid-liquid separation efficiency

Inactive Publication Date: 2003-07-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned spherical filter material has a high fiber density near the center of the filter material ball, so it is difficult to clean thoroughly during backwashing. After backwashing, the remaining sludge in the filter bed is large, resulting in low volume utilization of the filter tank.
In addition, due to the uneven fiber density of the filter bed formed by the spherical filter material, the gap between the filter material balls is large, resulting in uneven water flow during filtration, and the retention efficiency of the filter bed for suspended particles is reduced. Poor water quality
[0008] Chinese utility model ZL98249298.7 proposes a comet-type fiber filter material composed of comet nucleus and comet tail tow. This filter material overcomes the problems of uneven density of fibers in the filter bed of spherical fiber filter material and poor backwashing effect of the filter bed. defects, it has the advantages of high solid-liquid separation efficiency and good backwashing effect
However, the filter bed formed by it has poor void retention, and the filter bed is easy to be compacted under the action of water flow, causing the void to be clogged and unable to filter, especially when there is grease in the water, the clogging is more serious
[0009] Japanese Patent Laid-Open No. 8-182929 uses powdered oil-absorbing resin and hydrophilic fibers to co-heat to make filter fiber blocks, which is characterized by good filtration performance for oily water, but after grease and other suspended matter are embedded on the fiber block filter material, difficult to clean

Method used

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  • Fibrous filtering material for water treatment
  • Fibrous filtering material for water treatment
  • Fibrous filtering material for water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The ramie plant fibers with a monofilament diameter of 15 microns are bundled to form a filter material for a tow circle and a tail tow. The straightened length of the tow circle is 5 mm, and the length of the tail tow is 20 mm. Multiple ramie fibers form a silk bundle, and the diameter of the circumscribed circle of the bundle after bundle is 1.5 millimeters. The tow circle and tail wire are fixed in the tow section by hot pressing, and the tow section is made spherical by adding ceramic powder plastic, and the diameter of the circumscribed circle of the tow section is 2.5 mm.

[0032] Filter material

Embodiment 2

[0034] Viscose fibers with a single diameter of 10 microns and ramie fibers with a single diameter of 15 microns are mixed and bundled by 50% each to form two tow loops and tails. The straightened length of the tow circles is 40 mm, and the tails are The length of the tow is 120 mm, and the diameter of the circumscribed circle of the tow is 2 mm after a plurality of fibers are bundled. The tow ring and tail wire are fixed in the tow section by molding method, and the tow section is made of ellipsoidal porous ceramic microwave low-temperature sintering, and the diameter of the circumscribed circle of the tow section is 5 mm.

[0035] The filter size, the filling height of the filter material, and the operating conditions are the same as in Example 1, and the operating results are as follows.

[0036] Filtration rate 32 (m / h)

[0037] Influent ss 25-28 (mg / l)

[0038] Effluent ss 3-4 (mg / l)

[0039] Influent grease 15-48 (mg / l)

[0040] Effluent oil 2-4 (mg / l)

[0041] Back...

Embodiment 3

[0043] The acrylamide grafted modified polyester curly fiber with a single filament diameter of 27 microns constitutes a filter material for a tow loop and a tail. The straightened length of the tow loop is 60 mm, and the length of the tail is 150 mm. The diameter of the circumscribed circle of the tow after clustering the modified polyester fiber (polyester fiber) is 3 millimeters, and the tow ring and the tail are fixed in the tow section by injection method, and the tow section is made of rubber with metal powder added. Be spherical, and the diameter of the circumscribed circle of the tow node is 10 mm.

[0044] The filter size, the filling height of the filter material, and the operating conditions are the same as in Example 1, and the operating results are as follows.

[0045] Filtration rate 28-30 (m / h)

[0046] Influent ss 15-30 (mg / l)

[0047] Effluent ss 3-5 (mg / l)

[0048] Influent grease 80-120 (mg / l)

[0049] Effluent oil 5-12 (mg / l)

[0050] Backwash water co...

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Abstract

The present invention consists of tow node, tow ring in the middle part and tow tail. The tow ring and the tow tail are made of monofilament tow of plant fiber, hydrophilic synthetic fiber and / or hydrophilic artificial fiber. The tow node is solid or porous plastic, ceramic, rubber or metal body. The present invention is used for separating various suspension in water, especially separating suspended impurities containing oil or grease. The present invention has the advantages of great specific surface area, high filtering bed elasticity, high filtering material strength, long service life, high solid / liquid separating efficiency, great dirt tolerance and good back flush effect with low water consumption.

Description

technical field [0001] The invention relates to a filter material for water treatment, which is used for separating various suspended impurities in water, in particular for separating suspended impurities such as oil or fat in water, and belongs to the technical field of water treatment. Background technique [0002] In the fields of municipal sewage treatment, petroleum industry oily wastewater treatment, aquatic product breeding water circulation, food processing wastewater treatment and other fields, the filtration and separation of suspended particles and grease and other impurities from water is an important process link. [0003] The filtration of water is achieved by filling various shapes of filter materials in the filter. The filter is filled with filter material to form a filter bed. When filtering, the impurities in the water are intercepted by the filter bed, and the water flow is clarified through the gap formed by the filter material in the filter bed. The fil...

Claims

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Application Information

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IPC IPC(8): B01D39/04
Inventor 李振瑜刘沫
Owner TSINGHUA UNIV
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