CWS Iron, Manganese & Hydrogen Sulfide Removal

Question 1

What is the EPA secondary maximum contaminant level (SMCL) for iron in drinking water?

Accepted Answer

0.3 mg/L

Answer

0.1 mg/L

Answer

0.5 mg/L

Answer

1.0 mg/L

Question 2

Which odor is most characteristic of hydrogen sulfide gas in a water supply?

Accepted Answer

Rotten egg smell

Answer

Musty or earthy smell

Answer

Chlorine bleach odor

Answer

Metallic or bitter taste

Question 3

Which form of iron passes through a standard sediment filter without being captured?

Accepted Answer

Ferrous iron (dissolved)

Answer

Ferric iron (oxidized particulate)

Answer

Colloidal iron

Answer

Bacterial iron deposits

Question 4

What is the EPA secondary maximum contaminant level (SMCL) for manganese in drinking water?

Accepted Answer

0.05 mg/L

Answer

0.01 mg/L

Answer

0.1 mg/L

Answer

0.3 mg/L

Question 5

Which oxidation method is most commonly used to convert dissolved ferrous iron to filterable ferric iron?

Accepted Answer

Aeration

Answer

Ultraviolet radiation

Answer

Reverse osmosis

Answer

Ion exchange

Question 6

Greensand filtration media is primarily used to remove which group of contaminants from water?

Accepted Answer

Iron, manganese, and hydrogen sulfide

Answer

Nitrates and phosphates

Answer

Chlorine and volatile organic compounds

Answer

Calcium and magnesium hardness

Question 7

What pH range is most favorable for effective oxidation and removal of dissolved iron from water?

Accepted Answer

pH 7.0–8.5

Answer

pH 4.0–5.5

Answer

pH 5.5–6.0

Answer

pH 6.0–7.0