Sewage Treatment

What is a sewage treatment plant?

• The place where water is cleaned, filtered and tested before re-entering the water cycle.

• The place where water is cleaned, filtered and tested before going to our houses.

• The network of pipes that carry sewage (dirty water) from our houses.

• The place where water is bottled for drinking.

What type of living things eat the organic matter in the sewage?

• Plants

• Animals

• Bacteria

• Fungi

The primary treatment of sewage involves –

• digestion

• decomposition

• sedimentation and filtration

• none of these

What do water treatment plants mainly need to do?

• Clean and disinfect the water

• Boil and evaporate the water

• Remove the animals and plants

• All of the above

What is the first step in the water treatment process?

• coagulation

• filtration and removal of debris, sand, grit, etc.

• flocs

• concentation

What is the role of bacteria in the water purification process?

• digested organic matter
• add chlorine
• nothing, we don't want them in there
• add nutrients to the sludge

Bacteria are beneficial to wastewater treatment because

• they naturally break down organic matter
• they help solid material to settle out of the wastewater
• the nutrients produced are beneficial to the treated water
• they aren't beneficial

Select the correct order for the water treatment process.

• Sedimentation - Chlorination - Filtration
• Sedimentation - Filtration - Chlorination
• Filtration - Chlorination - Sedimentation
• Filtration - Sedimentation - Chlorination

During secondary treatment in the aeration tanks, what is working on the sewage waste?

• micro-organisms
• humans
• air titration
• oxidation/reduction

What does chlorination do to the water?

• Removes microorganisms
• Cleans the water
• Makes the water taste nice
• Removes twigs and sediment