Deck 2

Question 1

What is Turbidity?

Answer 1

-Is the measurement of light scattering property of water

Question 2

What are the units of Turbidity?

Answer 2

• (TU)

- (NTU)

Question 3

What are the effects of high temperature waste water?

Answer 3

• Chemical reaction
• Reaction rates
• aquatic life
• Depletion of DO
• ->Increase i biochemical reactions
• ->Oxygen is less soluble in warm water
• Beneficial uses

Question 4

What is electrical conductivity and in a solution?

Answer 4

• The ability to conduct an electrical current

- EC is transported by ions in a solution

Question 5

How is EC used for wastewater treatment?

Answer 5

-EC can be used to test the total dissolved solids

Question 6

What is specific gravity?

Answer 6

-Density per unit Density of the standard

Question 7

What is specific weight?

Answer 7

-Weight per unit Volume

Question 8

What is pH?

Answer 8

-log[H+]

Question 9

What is pOH?

Answer 9

14-pH

Question 10

What is a buffer solution?

Answer 10

-A solution that resists a large amount of pH change when acids or bases are added

Question 11

What is Alkalinity?

Answer 11

-The measure of the capacity of water to neutralize acids

Question 12

What is Alkalinity measured in?

Answer 12

-mg/L of Calcium carbonate (CaCO3)

Question 13

What are sources of Nitrogen?

Answer 13

• compounds of plants and animals
• sewage
• run offf

Question 14

What do the element Nitrogen and Phosphate provide for the environment?

Answer 14

-Growth of microorganisms

Question 15

What is BOD?

Answer 15

• Biochemical Oxygen Demand
• A chemical procedure for determining how fast biological organism use oxygen in a body of water.
• It is the measure of the amount of organic compounds in water
• Measure of the dissolved oxygen (DO) used by mirco- organisms

Question 16

What is COD?

Answer 16

• Chemical Oxygen Demand
• independent of the chemical composition in water
• A chemical oxidizing agent is used to oxidize the organics

Question 17

What is pH?

Answer 17

(-) log10 [H+]

Question 18

What is Dissolved Oxygen?

Answer 18

• O2 that diffuses into water by high pressure pushing O2 into water.
• measures the O2 that dissolved in water.

Question 19

Why is Dissolved Oxygen important in wastewater?

Answer 19

-It prevents harmful odors.

Question 20

What month typically will see the lowest levels of DO and Why?

Answer 20

• Summer months

- The increased temperature increases the rate of biochemical reactions in water which cause DO to lower.

Question 21

What is Oxidize?

Answer 21

-To combine chemically with O2

Question 22

What is Theoretical oxygen demand (ThoD)?

Answer 22

-The calculated amount of O2 required to oxidize a compound to its final oxidation products

Question 23

How is COD measured?

Answer 23

-The difference between the amount of oxidizing agents at the start of the test and that remaining at the end is the COD

Question 24

What are the typical procedures for measuring BOD in a LAB?

Answer 24

• measurements are done in a 300mL bottle
• bottles contain water to dilute wastewater
• inject with micro-organism

Question 25

How much higher is COD value from BOD?

Answer 25

1.25 times higher