Quartz sand filter uses quartz sand as the filter medium to filter high turbidity water through granular or non granular quartz sand of a certain thickness under a certain pressure to intercept and remove suspended solids. In this paper, let's talk about what we need to pay attention to when the quartz sand filter is running?
Precautions during operation of quartz sand filter are as follows:
Filtration rate: the filtration rate of quartz sand filter material should not be too slow. Because the filtration speed is too slow, the treated water per unit filtration area will become smaller. In order to achieve a certain amount of water, it is necessary to increase the filtering area and investment. However, too fast filtration speed will not only increase the head loss, but also shorten the filtration cycle and reduce the effluent quality. Therefore, the filtration rate of quartz sand filter is generally 10-12m / h.
What should be paid attention to when the quartz sand filter is running?
Backwashing: backwashing is used to remove the sludge in the filter layer of quartz sand filter, so as to restore the filtration capacity of filter material. In order to clean the sludge, there must be a certain backwashing speed and time. This is related to the size, relative density, expansion rate and water temperature of the filter material. The backwashing strength of quartz sand is 15L / (M2 · s), the expansion rate of filter layer during backwashing is 25% ~ 50%, and the backwashing time is 5 ~ 6min. Only with good backwashing effect can sand filtration run well.
Water flow uniformity: whether it is operation or backwashing, the water flow at each section shall be evenly distributed. To make the water flow uniform, the drainage system is better. Only the uniformity of water flow can make the filtration effect good.
The above is an introduction to the precautions for operation of Shandong multi-media filter manufacturers. As the filtration speed, backwashing and water flow uniformity are the main factors affecting the operation of quartz sand filter, these must be paid attention to when using quartz sand filter.