bullet major characteristics of global cities.

Once the flocs have settled to the bottom of the water, the clear water on top is filtered to separate additional solids from the water. During sedimentation, flocs settle to the bottom of the water because they are heavier than water. Sedimentation is one of the steps water treatment plants use to separate out solids from the water. Often, water treatment plants will add additional chemicals during this step to help the flocs form. Flocculation is the gentle mixing of the water to form larger, heavier particles called flocs. Flocculationįlocculation follows the coagulation step.

Common chemicals used in this step include specific types of salts, aluminum, or iron. When this occurs, the particles bind with the chemicals to form slightly larger particles. The positive charge neutralizes the negative charge of dirt and other dissolved particles in the water. During coagulation, chemicals with a positive charge are added to the water. Download image Water treatment steps CoagulationĬoagulation is often the first step in water treatment.

Bullet major characteristics of global cities.