A) Which of the following statements are true concerning the Safe Drinking Water

Question

A) Which of the following statements are true concerning the Safe Drinking Water Act secondary standards?

They are enforceable.

They are for compounds which make drinking water aesthetically pleasing

to consumers.

They enable drinking water to be potable.

They enable drinking water to be palatable.

All of the above.

B) A pollutant which degrades according to the equation dC/dt = -kC is said to react according to?

Zero order kinetics.

First order kinetics.

Second order kinetics.

None of above.

All of the above.

D) Recarbonation is necessary in drinking water treatment because:

The chemicals added during water treatment reduce the pH.

The chemicals added during water treatment increase the pH.

The chemicals added during water treatment consume carbon dioxide.

All of the above

None of the above

E) If the current mineral reserve of iron is 65,400 Tg, the annual demand is 1060 Tg and we assume the demand increases 1.2% annually, how long will the reserve last?

62 years

73 years

55 years

46 years

None of the above

F) A solution that has a [OH-] concentration of 10-3 M has a pH of a. 11

b. 7 c. 3 d. 10 e. -3 f. 12

G) 6. A dual media rapid sand filter used what two types of porous media for screening of small-sized particulate matter

Anthracite coal

Garnet

Gravel

Sand

Clay

H) The unit process that is used primarily for the removal of settleable solids such as coffee grinds and sand is:

Comminutor

Primary settling tank

Grit chamber

Secondary clarifier

Bar screen

I) The hardness of water is most commonly due to the presence of

CO32-

HCO3-

Ca2+

Mg2+

Cl-

All of above

None of the above

J) The single-most important purpose of secondary treatment is

Removal of suspended solids

Removal of suspended BOD

Removal of soluble BOD

Denitrification

Nitrification

All of above

K) The purpose of disinfection in drinking water treatment is/are concentration of 10-

Kill pathogens

Keep residual chlorine to the end point of the consumer

More palatable water

Prevent disinfection by-products

Reduce the turbidity

please let me know if you are not sure about one of your answers thanks :)

Explanation / Answer

A) Which of the following statements are true concerning the Safe Drinking Water Act secondary standards?

ANS -

They are for compounds which make drinking water aesthetically pleasing

to consumers.

B) A pollutant which degrades according to the equation dC/dt = -kC is said to react according to?

ANS - First order kinetics.

D) Recarbonation is necessary in drinking water treatment because:

ANS - The chemicals added during water treatment reduce the pH.

E) If the current mineral reserve of iron is 65,400 Tg, the annual demand is 1060 Tg and we assume the demand increases 1.2% annually, how long will the reserve last?

ANS - 55 years

A dual media rapid sand filter used what two types of porous media for screening of small-sized particulate matter

ANS - Anthracite coal

  Sand

H) The unit process that is used primarily for the removal of settleable solids such as coffee grinds and sand is:

ANS - Grit chamber

I) The hardness of water is most commonly due to the presence of

ANS -

Ca2+

Mg2+

J) The single-most important purpose of secondary treatment is

ANS - Removal of suspended solids

K) The purpose of disinfection in drinking water treatment is/are concentration of 10-

ANS - Kill pathogens

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