WWTP

Question 1

What are the 7 steps in waste water treatment process?

Answer 1

1. Bar screen
2. Grit Chamber - sand & dirt settle to bottom
3. Primary Clarifier - functions on principle of settling velocity, all organic matter at this stage - water flows over weir wall to
4. Aeration Basin - air bubbles and bacteria are added which promotes Aerobic Digestion (breakdown of organic matter using excess oxygen)
5. Secondary Clarifiers - filters, final removal of solids and biological matter
6. Disinfection - 3 ways: Chlorine (chemical) kills remaining bacteria but has to be removed, Ozone - electrical current pumped through water causing O3 damage to cells or UV Rays which scrambled bacteria’s DNA so that they can’t multiply.
7. Effluent Release - water is released into water source
   In rare cases where water is scarce, water is further treated for drinking - Full Cycle Water Reuse

Question 2

3 Types of Grit Chambers

Answer 2

1. Horizontal
2. Aerated
3. Vortex

Question 3

What are the 3 ways of Disinfecting water?

Answer 3

Chlorine (chemical) kills remaining bacteria but has to be removed.

Ozone - electrical current pumped through water causing O3 damage to cells

UV Rays which scrambled bacteria’s DNA so that they can’t multiply.