Water Treatment "Part 9": Backwash water.

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The size of the pores between the sand grains is decreased as a result of the removal of manganese oxides and iron hydroxide flocculants. As a result, the water flow at the bottom of the filter experiences more hydraulic resistance, and when this resistance is too great, the filter must be washed in reverse.


Backwashing cycle is run on the left filter of the test columns in a water filtration plant.

The backwash water, which makes up between 2 and 4 percent of the total drinking water production, must be treated before being discharged to surface water.
Prior to being transferred to the treatment units, the backwash water is first sent to a buffer tank. When producing drinking water is the goal, the ultrafiltration (UF) process is the optimum method of treatment. The membrane must be washed in reverse every 20 minutes, and the concentrated backwash water must be discarded, where the ultrafiltration process starts with water pressure forcing it to travel through tubes, vessels, or membranes to remove any suspended impurities.

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I once saw a water treatment plant in my university and thought this was magnificent! Even with a big plant, the water supply was still unsafe for drinking. Clean water is indeed important

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Yes, it is very important to treat water to make it safe to drink. Often, good treatment is not done in some countries, so you find that water from the tap appears polluted.
Thank you for your time and have a nice day.

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