The Water Treatment Process

Question 1

The water treatment process

Answer 1

Is the process of making sure water suitable for a desired end-use, such as drinking.

Question 2

Step 1

Answer 2

First, remove only large objects, like sticks, and garbage from the water. A metal screen covers the end of the pipe that draws the water from its source. The screen blocks objects from entering the treatment plant with the water.

Question 3

Step 2

Answer 3

Second, the water enters a large lank where alum (a chemical) is added. The alum is stirred into the water and and forms small, sticky lumps that attract most of the slides floating in the water. This combination of chemical and waste solids is called floc.

Question 4

Step 3

Answer 4

The water and floc enter a settling tank. The water flows slowly to allow the floc to settle at the bottom of the tank.

Question 5

Step 4

Answer 5

The partially cleaned water from the top of the settling tank now moves through a sand and charcoal filter. This removes only remaining waste solids and small pieces of floc that did not settle in the previous step. The water is now clear, colorless, and odorless.

Question 6

Step 5

Answer 6

The water may still contain micro organisms such as bacteria that can make people ill. Chlorine or ozone can be added to the water to kill these organisms. Chlorine is particularly effective because it remains active and water.

Question 7

Step 6

Answer 7

The treated water can then be stored in sealed containers, ready for use. This ensures a reliable flow of water whenever we need it.