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Book 2 Ch 3a - Specialized Treatment Processes Practice Quiz

front 1

The filter effluent manganese values are higher than the filter inlet water, yet
the iron content is low and the filter effluent is clear. What is the problem with
the greensand filter?

back 1

Manganese being leached from the greensand media

front 2

Which polyphosphate chemical is more effective at lower dosages?

back 2

Sodium metaphosphate

front 3

Why is lime sometimes added to water that is being aerated?

back 3

Increase pH and help remove CO2

front 4

Looking at the plumbing fixtures to see if stains are present is a good way to
tell what?

back 4

If iron or manganese are present

front 5

What is the recommended detention time to allow the continuation of iron
oxidation after aeration?

back 5

30-60 minutes

front 6

Iron can be oxidized by aerating the water to form insoluble ferric hydroxide.
This reaction is accelerated by an increase in what?

back 6

•Aeration SCFM

•pH

•CO2

•Dissolved oxygen

front 7

Why must chlorine be fed along with polyphosphate?

back 7

To prevent iron bacteria from growing

front 8

In oxidation of iron using aeration, an increase in pH has what effect on the
reaction?

back 8

Accelerates the reaction

front 9

Problem with the manganese greensand filtration system. The effluent is
turbid with a yellow to brown color. The effluent iron and manganese results
are high. What is the cause of the filter problem?

back 9

The lime dose ahead of the filter is too high

front 10

Potassium permanganate is often used with what type of filtration media?

back 10

Manganese zeolite or manganese greensand

front 11

Pink colored filtered water from a greensand filter is an indication of what?

back 11

The permanganate dose is too high

front 12

Why should chlorine never be fed ahead of the polyphosphate?

back 12

The chlorine will oxidize the iron and manganese causing insoluble
precipitates to form too soon

front 13

Manganese greensand filters can be operated in three modes:
continuous regeneration, catalytic regeneration and what other method?

back 13

Intermittent regeneration

front 14

Which chemical is effective in oxidizing iron and manganese to insoluble
oxides?

back 14

Potassium permanganate