1. The filtration resistance of the filter material layer is small
It is precisely because of the high porosity and large particle size of the fiber ball filter material that the filtration resistance of the filter material layer is very small. For example, after backwashing, the initial filtration resistance of the fiber ball filter material layer is only 0.02-0.03 meters of water head loss , while the initial filtration resistance of the quartz sand filter material layer reaches a head loss of 0.15-0.2 meters.
2. High filtration speed
Due to the large resistance of traditional filter media filtration, the filtration speed is limited. Usually, the filtration speed does not exceed 10-15m/h. Otherwise, the resistance of the filter layer will increase rapidly, reaching the limit of filtration resistance, and frequent backwashing has to be carried out. . In addition, the distribution of the void structure of the traditional filter material layer is unreasonable, and the suspended particles in the water body penetrate into the filter material layer with the high-speed water flow, which can easily lead to the penetration of the filter material layer, which is also the reason that the traditional filter material layer cannot perform high-speed filtration. s reason. The filtration resistance of the fiber ball filter material is small, even if the filtration speed is as high as 30-40 meters, the growth rate of the filtration resistance is still relatively slow, and the filtration will not be suspended due to the rapid increase of the resistance. Moreover, the lower layer of the fiber ball filter material has a small porosity, small pore size, and a large specific surface area. Even if the suspended particles penetrate into the filter material layer with the high-speed water flow, the effective interception of the filter material layer can be carefully studied through the bottom layer to prevent the filter material layer. penetrate. Of course, the high specific surface area of the entire fiber ball filter material layer and the high adsorption capacity of the fiber ball are also effective means to prevent the filter material layer from penetrating, and are also the guarantee of high-speed filtration of the fiber ball.
3. The filter material layer has a strong ability to intercept dirt
Due to the high porosity of the fiber ball filter material layer and the void distribution characteristics of the fiber ball filter material deep layer filter material layer, the dirt interception capability of the fiber ball filter material layer is greatly improved. The synchronous comparison experiment of water filtration shows that the interception capacity of traditional quartz sand filter material generally does not exceed 1-2kg/m3, while the interception capacity of fiber ball filter material layer is as high as 3-5kg/m3; Due to the rapid blockage of the surface filter material voids, the filter material layer has a contamination interception capacity of 0.1-0.2kg/m3. When the fiber ball filter material filters waste water, it is precisely because of the interception of large particles suspended on the surface of the filter material layer, which is more sufficient. It plays the role of interception inside the filter material layer, so that the dirt interception capacity of the fiber ball filter material layer is further improved to 5-10kg/m3.
4. Long filtering cycle
Due to the strong dirt interception ability of the fiber ball filter material layer, the filtration cycle is significantly improved. When filtering feed water at the same filtration rate, the filtration period of the fiber ball is at least 3-4 times that of the quartz sand filter material: when the sewage is filtered at the same filtration rate, the period of the quartz sand filter material is even only 10-20min, while the fiber ball filtration period is at least 10-20 minutes. for more than 8 hours. That is, the cycle of the fiber ball filtering sewage is even more than 50 times that of the quartz sand filter material. Because there is no need for frequent backwashing, the fiber ball filtration is very convenient and stable, and the workload can be reduced.