Water Quality Control

Question 1

What is municipal water?

Answer 1

Collection, treatment and distribution of water that provides safe drinking water or potable water

Question 2

What is wastewater?

Answer 2

Collection and treatment of wastewater before it is released back into the local stream, lake or coastal waters

Question 3

What are the primary responses of these two systems?

Answer 3

 Kill pathogens before and after water usage

 Reduce the BOD in the water

 Reduce the nutrient loading to protect the ecological health of the receiving water

 Removal of other toxins such as industrial solvents, heavy metals and pharmaceutical products

Question 4

What is the purpose of water treatment systems?

Answer 4

Raw water to potable water

Question 5

What does the treatment of surface water include?

Answer 5

 Particle removal
 Microbial contamination
 Dissolved inorganics

Question 6

What is the sequence of events for Surface Water?

Answer 6

 Screen and grit removal
 Primary Sedimentation (Clarifier)
 Mixing and Coagulation
 Flocculation
 Secondary Settling
 Filtration
 Sludge processing
 Disinfection contact

Question 7

What is the sequence of events for Ground Water?

Answer 7

 Aeration
 Flocculation
 Sedimentation
 Recarbonation
 Filtration
 Sludge processing
 Disinfection contact

Question 8

What is sedimentation?

Answer 8

The simplest form of water treatment. The longer the detention time, the more effective the sedimentation
process

 HOWEVER, this means you need a bigger tank and more time
 Expensive!

Question 9

What is coagulation?

Answer 9

A chemical treatment

Question 10

What are the pH levels of neutral water?

Answer 10

between 6 and 8,5

Question 11

With increase in cost what are the steps of removing impurities?

Answer 11

 Microfiltration
 Ultrafiltration
 Nanofiltration
 Reverse Osmosis

Question 12

What is purified water also known as?

Answer 12

Permate

Question 13

What is Influent water also known as?

Answer 13

Feed

Question 14

What is waterstream water also known as?

Answer 14

Concentrate

Question 15

What is the purpose of primary treatment?

Answer 15

to screen the water, remove

the grit, allow for particle settling, disinfection and release

Question 16

What is the purpose of secondary (biological treatment)?

Answer 16

to provide additional BOD and SS removal