Multimedia filters mainly use a variety of media, under a certain pressure, the turbidity of water through the filter, effectively intercept and remove suspended matter, organic matter, colloid particles, chlorine, odor and some heavy metal ions in the water, and ultimately achieve a high-efficiency filtration equipment to reduce water turbidity. However, some users find that the effluent effect of the filter is not very good in the process of using. What is the reason for this phenomenon?
1. Uniformity of flow
Whether in operation or backwashing, uniform distribution of water flow in each section is required. In order to make the water flow uniform, the drainage system should be good. Only the uniformity of water flow can make the filtering effect good.
2. filtration rate
Multimedia filters should not be too slow. Because the filtration speed is too slow, the amount of treated water per unit filtration area is small. In order to achieve a certain amount of effluent, it is necessary to increase the filtering area and investment. But if the filtration speed is too fast, not only the head loss is increased, but also the filtration cycle is shortened, and the quality and quantity of the effluent will be reduced. The filtration rate is usually 10-12 m/h.
Backwashing is used to remove the sludge in the filter layer to restore the filtering capacity of the filter material. In order to clean the sludge, it is necessary to have a certain speed and time of backwashing. This is related to the size and relative density of filter media, expansion rate and water temperature. When backwashing, the expansion rate of the filter is 25%-50%, and the backwashing time is 5-6 minutes. Only when the backwashing effect is good can the sand filter run well.
After reading the introduction of Xiaobian, I believe you have some knowledge about several factors that affect the effluent effect of multi-media filters. Of course, if you have other questions, you can leave a message at the end of the article, Xiaobian will reply to you in time!
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