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B Exam: Iron And Manganese

front 1

Greensand treated with Potassium Permanganate is used to remove ______ from water?

back 1

Iron and manganese

front 2

An iron bacteria that will oxidize iron in water and use the energy for reducing carbon dioxide to organic forms is a?

back 2

Crenothrix, Thiothrix

front 3

What is the best method to test for iron in the water?

back 3

Atomic Absorption (AA)

front 4

When testing for iron, if there is clay or visible rust you should not ______ the sample?

back 4

Acidify, Also, ask lab to analyze immediately

front 5

Polyphosphate should always be added to the water prior to?

back 5

Chlorine

front 6

Never use a polyphosphate over ______ old?

back 6

48 hours

front 7

A WTP using polyphosphate to control iron corrosion is getting calls because of red water in the distribution system. What is the likely cause of the red water?

back 7

Ans. Iron Bacteria
Ans. Polyphosphate reverted to orthophosphate

front 8

Soluble iron can be oxidized to insoluble precipitates by ______ and removed by sedimentation & filtration?

back 8

Ans. Chlorine
Ans. Aeration
Ans. Potassium Permanganate

front 9

When using aeration to oxidize Iron from the water, increasing the ______ will improve the removal efficiency?

back 9

pH

front 10

What chemical is commonly used to dechlorinate large amounts of water?

back 10

Sodium Bisulfite

front 11

Potassium Permanganate is used with ______ to remove iron and manganese from water.

back 11

Greensand Filtration

front 12

What is used to regenerate a manganese greensand filter?

back 12

Permanganate (KMnO₄)

front 13

What causes pink water?

back 13

Overdose of KMnO₄

front 14

A WTP with greensand treatment is receiving red water complaints from its customers. What is the likely cause?

back 14

Ans. Iron Bacteria
Ans. Greensand needs to be regenerated with KMnO₄

front 15

Electromedia iron and manganese removal systems use what chemical to remove sulfur compounds causing taste and odor problems?

back 15

Small dose of sulfur dioxide

front 16

The influent to a manganese greensand filter has a pinkish/orange color. What does this indicate?

back 16

Normal and will be removed by the filter

front 17

A pink color in the greensand filter effluent indicates?

back 17

Overdose of KMnO₄

front 18

Greensand filter effluent has a yellow to brownish color. Effluent has high iron and manganese content. What is the problem?

back 18

High Alkalinity

front 19

How would you correct the problem in question 18?

back 19

Reduce alkali feed; maintain pH during Cl₂, addition between 6.2-6.5.

front 20

How would you get rid of the red water that is in the distribution system?

back 20

Flush fire hydrants

front 21

Filter effluent clear, iron level low, and manganese level higher than raw water. What is the most likely cause?

back 21

Manganese leaching from greensand; bed is insufficiently regenerated