TREATMENT OF WATER

1. The world’s available fresh water supply is about _______ percent of that total water supply.

• 10

• 4

• 3

• 7

2. Which of the following related to the aerobic organic matter is true?

• Essential nutrients for growth

• Development of sludge deposits

• Growth of undesirable aquatic life

• Development of septic conditions

3. ______ tend to resist conventional methods of wastewater treatment.

• Suspended solids

• Nutrients

• Refractory organics

• Priority pollutants

4. Organic matter + nutrients + O₂ → CO₂ + H₂O + _______

• Biomass

• Nutirent

• O2

• Organic matter

5. 2NH₃ +3O₂ -> 2NO₂^– + ___ + 2H₂O.

• O2

• 2H+

• H+

• 2O2

6. What is the rate of a chemical reaction not dependent on?

• Stoichiometry

• Surface area of reactants

• Temperature

• Pressure

7. The degradation of BOD is classified as what type of reaction?

• First order

• Second order

• Third order

• Zero order

8. Which of these have a negative electrical charge?

• Calcium

• Magnesium

• Sodium

• Chloride

9. The colour of the artificial zeolite is______

• Green

• Yellow

• Grey

• White

10. Natural zeolite is mainly processed from_____

• White sand

• Green sand

• Grey sand

• Red sand