The water in the sifting stage passes through a sieve designed to filter out large plankton such as fish, plants, and wood, and prevents it from entering the water treatment plant.
In the agglomeration stage, the water is supplied with chemicals that carry positive charges, as the positive charges remove the effect of the negative charges carried by dust and other particles dissolved in the water, allowing the particles to bind with the added chemicals and form large particles.
The water reaches the sedimentation basin after the completion of the agglomeration stage. It is a large basin in which the blocks are deposited at the bottom. The deeper the basin, the greater the amount of deposited blocks. As large blocks are deposited to the bottom faster than small blocks, and during their descent, they collide with small particles, dragging them with them. The water should remain inside the tank for a period of time not less than four hours.
Filtration is the last step to remove suspended particles in water and unstable masses. One of the most commonly used types of filters is a quick sand filter, as the water moves upward through sand, which contributes to removing the layer on top that contains organic compounds, and there are other types of filters Such as pressure filters that filter particles much smaller than paper and sand filters, ultrafiltration membranes, slow sand filters, activated charcoal and diaphragm filters.
In the treatment stage, harmful germs that may be found in water such as parasites, bacteria, viruses, and other organisms are eliminated by adding some substances and disinfectants such as ozone, chlorine, chloramines, etc., and an additional amount of disinfectants is usually placed in the water to kill any pathogens as they travel in pipelines that reach users.
- ↑ ANN WOLTERS (2017-10-3), “5 Steps of Water Purification”, livestrong, Retrieved 2018-8-2. Edited.
- ↑ “Water Treatment”, cdc, Retrieved 2018-8-2. Edited.
- ^ a b “Water purification”, newworldencyclopedia, Retrieved 2018-8-2. Edited.
- ↑ “SURFACE WATER TREATMENT”, watereducation, Retrieved 2018-8-2. Edited.
What are the stages of treating surface water to become potable