Why is it necessary to backwash quartz sand?
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Release time:
2020-05-04
The issue of must first be discussed from the function of a quartz sand filter. Quartz sand primarily removes suspended matter, silt, organic matter, and other impurities from water, mainly through interception by the quartz sand.
After a quartz sand filter has been in operation for some time, many fine particles, such as mud and organic matter, accumulate in the gaps between the sand grains. If backwashing is not performed, the silt will block the water passage, reducing the water pressure and flow rate after filtration. This wastes valuable energy (electricity, water pump power) and reduces the filtration flow rate, failing to achieve the desired water output.
Therefore, quartz sand filters must be backwashed after a period of use.
Quartz Sand Filter Backwashing Methods
There are two methods for backwashing quartz sand filters: air-water backwashing and water backwashing.
Air-Water Backwashing
This method utilizes the friction between air bubbles and the quartz sand filter media, the friction between the filter media particles, and the friction between the filter media and water. The combined effect of these three forces significantly enhances the backwashing efficiency, allowing the quartz sand filter media to be reused after backwashing.
This method is generally used for larger filter tanks with a larger amount of quartz sand filter media. Advantages include shorter backwashing time and lower water consumption.
Water Backwashing
This method primarily relies on the friction between the quartz sand filter media and water, as well as the friction between the sand particles, to remove impurities from the water.
This method is commonly used for smaller filters. The backwashing water volume is generally twice the operating flow rate. Its characteristics include: no need for an air source, higher water consumption, and simple operation.
Quartz sand filters can be used in the pretreatment system of water treatment to adsorb suspended solids and other impurities in the water.
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