Treating Wastewater

Ava, Benjamin, and Mason are on a field trip to a wastewater treatment plant. They learn that the 1st step in treating wastewater is

• Wastewater flows through screens to catch large particles such as food and lot of trash.

• The water is pumped into open pools where air and sunlight is used to purify it.

• Particles that are still present in the water settle down forming sludge

• The water flows through a bed of gravel which is covered with colonies of bacteria.

Particle that settle at the bottom of the tank is called

(a)  

What is the second step in treating wastewater?

• The water is pumped into open pools where air and sunlight is used to purify it.

• Particles that are still present in the water settle down forming sludge.

• The water flows through a bed of gravel which is covered with colonies of bacteria.

• Wastewater flows through screens to catch large particles such as food and lot of trash.

How are large particles such as food and trash removed from wastewater?

• The water is pumped into open pools where air and sunlight is used to purify it.

• Particles that are still present in the water settle down forming sludge.

• Wastewater flows through screens to catch large particles such as food and lot of trash.

• The water flows through a bed of gravel which is covered with colonies of bacteria.

What happens to the particles that are still present in the water during wastewater treatment?

• Particles that are still present in the water settle down forming sludge.

• The water is pumped into open pools where air and sunlight is used to purify it.

• Wastewater flows through screens to catch large particles such as food and lot of trash.

• The water flows through a bed of gravel which is covered with colonies of bacteria.

What is the final step in treating wastewater?

• The water is pumped into open pools where air and sunlight is used to purify it.

• Particles that are still present in the water settle down forming sludge.

• Wastewater flows through screens to catch large particles such as food and lot of trash.

• The water flows through a bed of gravel which is covered with colonies of bacteria.

What is the purpose of the bed of gravel covered with colonies of bacteria in wastewater treatment?

• The water is pumped into open pools where air and sunlight is used to purify it.

• Particles that are still present in the water settle down forming sludge.

• Wastewater flows through screens to catch large particles such as food and lot of trash.

• The water flows through a bed of gravel which is covered with colonies of bacteria.