Waste Water Engineering Practice Test 9

1. What is the maximum operating flow for mixed bed units?

12 BV/h

15 BV/h

14 BV/h

13 BV/h

2. Which type does the following reaction belong to?
Chlorine dioxide added to destroy bacteria.

First order reaction

Accelerating rate

Pseudo first order

Decelerating rate

3. ________ is the removal of calcium, magnesium and certain other metal cations in hard water.

Cleaning

Sedimentation

Disinfection

Softening

4. What is the EE/O for DCA in kWh/1000 US gal/order?

5. Which of the following is not a chemical disinfectant?

Bromine

Ozone

Chlorine

6. The liquid expands back into a gas as it leaves the cylinder.

True

False

7. Which of the following can be inactivated using ozone?

Algae

Protozoa

Fungi

All microbes

8. How is the operating cost calculated for an advanced oxidation process system in $ per 1000US gallon?

Total operating cost = 1.45 x electrical cost + Peroxide cost

Total operating cost = 1.5 x electrical cost + Peroxide cost

Total operating cost = electrical cost + Peroxide cost

Total operating cost = 0.45 x electrical cost + Peroxide cost

9. Which of these is used as the most common disinfectant?

UV rays

Ozone

Chlorine dioxide

Chlorine

10. Which of these is the most efficient method to remove arsenic?

Coagulation by Iron hydroxide

Green sand

Activated alumina

Tehonoarz