What are the main materials of glass fiber filter materials?

(1) Surface properties. The surface area of glass fibers depends on their thickness. In the production process of certain types of filter materials (such as filter paper), glass fibers do not expand, so the fiber diameter, cross-sectional geometry, and corresponding specific surface area remain unchanged. The stability of this size is a necessary condition to ensure that the filter material has both low resistance and high efficiency under high flow conditions. (2) Mechanical strength. The strength of glass fiber is related to many conditions such as the composition of the raw material glass, the fiber forming method, the presence of defects on the fiber surface, and the physical and chemical interaction with the surrounding medium. Glass fiber is hydrophilic and can reduce surface energy after being adsorbed by water. In humid air and water, the tensile strength of glass fibers will decrease by 15% to 30%. If its adsorption of moisture in the air can be ruled out, glass fibers have considerable strength regardless of whether they are at high or low temperatures. In order to improve the performance of glass fiber, spraying adhesive materials are often used in the production process of glass fiber, which can not only make the fibers overlap each other, but also change the fiber performance, so that some products have moisture absorption less than 1%, hydrophobicity greater than 98%, and have good chemical stability. (3) Bending resistance and wear resistance. Glass fiber used as a bulk filling filter, usually with a diameter of 8-19 μ M varies. From the perspective of filtration efficiency, the finer the fiber diameter, the better. However, the strength of excessively fine glass fibers is very low, which can easily break and cause blockage. Therefore, the filling coefficient should not be too large, usually 6% to 10%; In order to prevent breakage and scaling in application, corresponding protective measures should be taken when making filter materials, such as spraying a protective layer, adding a bottom lining protective net, etc.

Classification of fiber bundle filter materials and different products used for water filtration

Fiber bundle filter material is a commonly used filtering material used in the fields of water treatment and liquid filtration. It is composed of fiber bundles, which capture and retain suspended solid particles through the gaps and surfaces between fibers, thereby achieving the purpose of filtration. According to the different characteristics and application scenarios of fiber bundle filter materials, they can be divided into the following categories: Fiber ball filter material: Fiber ball filter material is bundled by fiber bundles into spherical or ball like shapes, with a large surface area and porosity. It is suitable for general water treatment and liquid filtration, and can effectively remove larger particulate matter and suspended solids. Fiber cloth filter material: The fiber cloth filter material adopts a uniform cloth like structure made of fiber bundles, which has high filtration efficiency and small pore size. It is suitable for situations that require high filtration accuracy and can effectively remove small particles, colloids, and bacteria. Fiber cotton filter material: Fiber cotton filter material is made of fiber bundles processed into cotton shape, with a relatively loose structure and large porosity. It is suitable for the coarse filtration and pre-treatment stages and can remove larger particles and rough suspended solids.

Compared to traditional filter media

Due to the higher turbidity removal rate of fiber bundle filter media compared to traditional filter media, routine testing of the filtered water in the fiber bundle filter tank showed that the ammonia, nitrogen, and nitrite nitrogen content were 20-25% lower than that of particle filter media, while iron and manganese were 20-30% lower. Oxygen consumption and microbial indicators also decreased. In the same situation, compared with traditional filter media, fiber bundle filter media has better operating parameters such as filtration rate, filtration cycle, filtration water volume, and head loss than uniform particle filter media. After calculation, the MSC of the uniform particle filter material is 664kg/m3, and the MSC of the fiber filter material is 2024kg/m3. The fiber filter material pool is three times higher than the uniform particle filter material pool, indicating that the filtration performance of the fiber bundle filter material is better than that of the particle filter material. The fiber bundle filter material avoids the limitation that the particle size of the particle filter material cannot be reduced downwards, so that the diameter of the filter material reaches μ M-level greatly increases the specific surface area of the filter material, reaching 3500m2/m3, increasing the contact opportunity between suspended solids in water and the filter material and the adsorption capacity of the filter material, thereby improving the filtered water quality. The porosity of the bundle fiber filter material is greater than 0.9, and the interception capacity can be increased without increasing the filtration resistance. Moreover, the filtration speed is high and the filtration cycle is long. The service life of fiber bundle filter material is more than 10 years, avoiding the trouble of frequent filling and regular replacement of traditional filter materials, reducing the labor intensity of workers and the time for water outage maintenance

Advantages of fiber filter materials

It uses polymer fiber bundles as filtering materials, with single filament diameters ranging from tens of micrometers to a few micrometers. It belongs to the micron level filtering material (sand filters belong to the millimeter level) and has a huge specific surface area, greatly improving the interception and adsorption ability of particles in water. The removal rate of suspended solids in water can approach 100%. After good coagulation treatment, when the suspended solids content in the filtered water is 20mg/L, the suspended solids can reach below 1mg/L. It has a significant removal effect on impurities such as bacteria, viruses, macromolecular organic matter, colloids, and iron. The removal rate of suspended solids with particle size greater than 5um reaches 90-95%., Solved the problem of the filtration accuracy of granular filter material being limited by the particle size of the filter material. It is an updated product of filtration equipment for granular materials such as quartz sand. The mechanical adjustment device can quickly adjust the stacking density of the bundle filter material according to the requirements of effluent quality and filtration rate. High quality fiber bundle filter materials have the following advantages: (1) Chemical stability is strong, and no harmful ingredients are dissolved in the water filtering process; (2) The high strength friction, collision, and shear force of anti washing gas water will not cause damage, loss, or material leakage; (3) Soaked in water for many years, it is durable and non corrosive, and its service life can generally reach 5-10 years; (4) Low filtration resistance, fast filtration rate, and can ensure good filtration effect within the filtration rate range of 25-35m/h. (5) The fiber bundle filter layer automatically forms a stepless porous filter layer with gradually decreasing porosity along the water flow direction, without the need for manual grading like granular filter materials (6) Ordered filter layer: The fiber bundle filter material is suspended inside the filter or filter tank, resistant to impact, not disordered layers, and not lost. It can withstand high-strength cleaning, including high-flow gas-water combined cleaning. (7) The interception capacity is large, usually 5-15kg/m3 filter material, which is 2-3 times that of traditional filters. (8) The footprint is small, producing the same amount of water, and the footprint is only 1/3 to 1/8 of that of traditional filters. (9) The cost of producing the same amount of water per ton is low, and the cost is lower than that of traditional filters. (10) The water consumption for backwashing is low, only 1-3% of the periodic water production. Generally, raw water can be used for backwashing.

Applicable scope of fiber bundle filter material

1. Drinking water treatment (tap water, drinking water, purified water, high-purity water) 2. Industrial water treatment (high-efficiency filters in industries such as power, chemical, printing and dyeing, electroplating, etc.) 3. Circulating water treatment (swimming pool water treatment, aquarium water circulation, water parks, artificial landscapes, freshwater aquaculture) 4. Cooling water treatment (industrial cooling water, air conditioning cooling water, cooling system makeup water, cooling system side filter water purification) 5. Sewage treatment (direct treatment of effluent after physicochemical/biochemical treatment of domestic or industrial wastewater) 6. Water treatment (miscellaneous water reuse, water treatment in hotels, and water treatment in accommodation areas)

Working principle of fiber filter material

When filtering, the gravity of the water level in the filter or filter tank from top to bottom is used to compress the filter layer, and the fiber bundle filter material is in a dense state, improving the efficiency of the filter layer in intercepting impurities and ensuring the water quality after filtering. During flushing, the air and water impact and disturb from bottom to top, causing the bundle filter material to be in a suspended and loose state, and the adsorbed and intercepted substances in the filter layer to be eluted. Thus, the optimal state of disorderly loading and orderly loading and backwashing of bundle fiber filter materials is achieved. When in use, water enters from the upper part and exits from the lower part. At this point, under the action of water flow and gravity, the fiber density regulating device drives the fiber filter bed to run downwards, compressing the fiber filter layer. Its stacking density gradually increases along the water flow direction, causing the porosity of the filter layer to gradually decrease along the water flow direction. The corresponding pore diameter and pore size of the filter layer gradually decrease, thus forming a particularly ideal variable pore deep filtration state. The filtration process includes both horizontal deep filtration and vertical deep filtration, effectively improving the filtration accuracy. When the filter layer is contaminated and needs to be cleaned and regenerated, the cleaning water passes through the fiber filter bed in the opposite direction. Under the action of backwashing water flow and cleaning air, the fiber density adjustment device drives the fiber filter bed to move upwards, causing the fiber filter material to extend upwards and reach a loose state. Through the air water mixed cleaning technology, the fiber filter material is in a continuous shaking state in the longitudinal direction during bubble accumulation and hydraulic flushing, which makes the fiber filter material clean very thoroughly, Thus achieving the ideal cleaning effect.

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