Fiber filtering material having sponge structure, its preparing method and use

A technology of fiber filtration and sponge body, which is applied in the field of materials and environment, and can solve the problems of difficult backwashing, small fiber porosity, easy accumulation and compactness, etc.

Inactive Publication Date: 2009-07-22
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these fiber filter materials have a disadvantage: the fiber itself is straight, or only through simple twisting, and lacks elasticity, so the porosity between the fibers is small, the bulkiness is poor, and it is easy to accumulate densely under pressure.
These factors lead to reduced sewage interception, reduced filtration rate, and difficult backwashing
At the same time, the diameter of the fiber is relatively thick, about tens to hundreds of microns, and uneven large pores are easy to form between the filter materials, which makes the filtering effect worse.

Method used

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  • Fiber filtering material having sponge structure, its preparing method and use
  • Fiber filtering material having sponge structure, its preparing method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Melt-spin polyester chips at 250-300°C at a spinning speed of 1000-3000 m / min, stretch 3-5 times, and heat-set at 150-250°C. Bundle the fibers and tie a knot every 1-5cm with sewing thread, and tie it tightly to prevent the fibers from slipping off. Cut every two knots to make amphibious spherical and amphibious columnar fiber filter materials, as shown in the attached figure 1 .

[0022] (2) Polyester and polypropylene or nylon are blended or composite spun at a spinning speed of 500-2500 m / min, stretched 3-6 times, and heat-set at 120-200°C. The fibers are bundled so that the number of single fibers reaches 500 to 2000. Inject a knot every 1-30cm on the injection molding machine. Cut every other one or two knots near the knots to make umbrella-shaped or spindle-shaped fiber filter materials, as attached figure 2 .

Embodiment 2

[0024] Put the above-mentioned filter material in the filter column, the height of the filter layer is 0.8-1.5 meters, the influent turbidity is below 150NTU, micro-flocculation filtration, the filtration rate is 50-100 m / hour, and the effluent turbidity can reach below 1NTU. If the influent turbidity is below 50NTU, the effluent can be directly filtered without flocculation, and the effluent can still reach below 1NTU.

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Abstract

A fibrous filter material with sponge structure for treating water with high efficiency and speed is prepared from two or three of polyester, polypropene, polyacrylonitrile and nylon through spinning, stretching, thermally fixating shape to become sawtooth or spiral fibers with elastic structure, binding, tying and cutting short.

Description

technical field [0001] The invention belongs to the technical field of materials and environment, and in particular relates to a fiber filter material with a "sponge body" structure, its preparation method and application. Background technique [0002] Water used in waterworks, power plants, industrial boilers, chemical or pharmaceutical industries must undergo pretreatment to remove suspended solids and oil stains in the water. The traditional method is sand filtration, which uses quartz sand, anthracite, zeolite, etc. to make granular materials as filter materials. However, the sand filtration method has low efficiency, small interception capacity, low filtration speed (several meters to more than ten meters per hour), and high energy consumption. Now, fiber filter materials are gradually being studied and adopted. Fiber filter material is divided into long fiber filter material and short fiber filter material. Due to the difficulty in backwashing operation of long fiber...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/04
Inventor 曾凡龙任庆春薛罡刘振鸿
Owner DONGHUA UNIV
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