CLASS B WATER OPERATOR UPDATED ACTUAL Questions and CORRECT
Answers
1. The quality of ground water • Quality of water doesnt change much
can be described as follows: • not many pathogens (if any)
• High iron and manganese content
• Very hard water
• high levels of undesirable gases
• Often corrosive
• Possibility of high fluoride, radioactivity, and nitrate levels is
greater than surface water
• Potential for ammonia is especially high in illinois
2. What undiserable gases may Carbon dioxide (CO2) Ammonia (NH3) Methane (CH4) and
appear in ground water? Hydrogen Sulfide (H2S)
3. The quality of surface water • Quality changes frequently, requiring changes in treatment
can be described as follows: methods
• Pathogen potential is certain of high
• High manganese and iron content mostly occurs during
turnover or runoff
• Taste and odor problems may occur from Algae, decaying
vegetation, spills and runoff
4. Nuisance bacteria Not pathogens; Includes iron bacteria, Sulfate reducing bac-
teria and methane forming bacteria
5. What are the three types of Crenothrix, Leptothrix and Gallionella
Nuisance Bacteria?
6. What is the most common Iron Crenothrix
bacteria?
7. When it comes to iron bacte- ference between which two?
ria, it is difficult to tell the dif-
,Crenothrix and Leptothrix
,8. All iron bacteria does not grow 50°F
well in temperatures below..?
9. Crenothrix does not grow well 4mg/L of oxygen
in water with more than...?
10. Gallionella bacteria prefers...? Dark places to grow
11. Nuisance bacteria does what They convert them from soluble compounds into insoluble
to iron and manganese com- compounds that can plug well screens and distribution sys-
pounds? tem pipes
12. When soluble iron is convert- Brown, slimy jelly like deposits that contain ferric hydroxide
ed to insoluble compounds,
what types of deposits my be
formed
13. What can indicate the pres- Black deposits of iron sulfide and the rotten egg odor of
ence of Sulfate reducing bac- hydrogen sulfide indicate the presence of sulfate reducing
teria? bacteria
14. What conditions to sulfate re- Anaerobic conditions (meaning they can also develop in tu-
ducing bacteria prefer in order bercles in the distribution system, where anaerobic conditions
to grow? exist)
15. Methane forming bacteria are Ground water supply
usually only be find in...?
16. Methane forming bacteria Anaerobic
prefer what type of condi-
tions?
17.
, In order to control nusiance Chlorinating a well at 50mg/l for a few hours and continuously
bacteria, what can be done? pumping a dosage of 1mg/l after initial disinfection for about
a week to prevent receding bacteria can be done to control
nusiance bacteria
18. Adequate removal of iron To prevent iron bacteria from forming and turning the water
should be provided at a water red
treatment plant, why is this?
19. What is the usual order of Oxidation —> Reaction Basin —> Filtration —> Sequestra-
treatment techniques for im- tion
proving ground water?
20. when is chlorine usually added After oxidation and filtration
during ground water treat-
ment?
21. When is fluoride usually added After filtration
to ground water during treat-
ment?
22. When do the Ten States Stan- When treating water with high iron and/or manganese con-
dards require sedimentation tent, or where chemical coagulation is used to reduce the load
basins before the filters? on filters
23. What is the primary purpose To remove undiserable gases (Like hydrogen sulfide and
of ground water treatment? methane) and solids (like iron and manganese)
24. What is the first step in ground Oxidation
water treatment?
25. How is oxidation achieved? Through aeration alone or by chemical oxidation via chlorine,
Potassium permanganate, ozone or chlorine dioxide
Answers
1. The quality of ground water • Quality of water doesnt change much
can be described as follows: • not many pathogens (if any)
• High iron and manganese content
• Very hard water
• high levels of undesirable gases
• Often corrosive
• Possibility of high fluoride, radioactivity, and nitrate levels is
greater than surface water
• Potential for ammonia is especially high in illinois
2. What undiserable gases may Carbon dioxide (CO2) Ammonia (NH3) Methane (CH4) and
appear in ground water? Hydrogen Sulfide (H2S)
3. The quality of surface water • Quality changes frequently, requiring changes in treatment
can be described as follows: methods
• Pathogen potential is certain of high
• High manganese and iron content mostly occurs during
turnover or runoff
• Taste and odor problems may occur from Algae, decaying
vegetation, spills and runoff
4. Nuisance bacteria Not pathogens; Includes iron bacteria, Sulfate reducing bac-
teria and methane forming bacteria
5. What are the three types of Crenothrix, Leptothrix and Gallionella
Nuisance Bacteria?
6. What is the most common Iron Crenothrix
bacteria?
7. When it comes to iron bacte- ference between which two?
ria, it is difficult to tell the dif-
,Crenothrix and Leptothrix
,8. All iron bacteria does not grow 50°F
well in temperatures below..?
9. Crenothrix does not grow well 4mg/L of oxygen
in water with more than...?
10. Gallionella bacteria prefers...? Dark places to grow
11. Nuisance bacteria does what They convert them from soluble compounds into insoluble
to iron and manganese com- compounds that can plug well screens and distribution sys-
pounds? tem pipes
12. When soluble iron is convert- Brown, slimy jelly like deposits that contain ferric hydroxide
ed to insoluble compounds,
what types of deposits my be
formed
13. What can indicate the pres- Black deposits of iron sulfide and the rotten egg odor of
ence of Sulfate reducing bac- hydrogen sulfide indicate the presence of sulfate reducing
teria? bacteria
14. What conditions to sulfate re- Anaerobic conditions (meaning they can also develop in tu-
ducing bacteria prefer in order bercles in the distribution system, where anaerobic conditions
to grow? exist)
15. Methane forming bacteria are Ground water supply
usually only be find in...?
16. Methane forming bacteria Anaerobic
prefer what type of condi-
tions?
17.
, In order to control nusiance Chlorinating a well at 50mg/l for a few hours and continuously
bacteria, what can be done? pumping a dosage of 1mg/l after initial disinfection for about
a week to prevent receding bacteria can be done to control
nusiance bacteria
18. Adequate removal of iron To prevent iron bacteria from forming and turning the water
should be provided at a water red
treatment plant, why is this?
19. What is the usual order of Oxidation —> Reaction Basin —> Filtration —> Sequestra-
treatment techniques for im- tion
proving ground water?
20. when is chlorine usually added After oxidation and filtration
during ground water treat-
ment?
21. When is fluoride usually added After filtration
to ground water during treat-
ment?
22. When do the Ten States Stan- When treating water with high iron and/or manganese con-
dards require sedimentation tent, or where chemical coagulation is used to reduce the load
basins before the filters? on filters
23. What is the primary purpose To remove undiserable gases (Like hydrogen sulfide and
of ground water treatment? methane) and solids (like iron and manganese)
24. What is the first step in ground Oxidation
water treatment?
25. How is oxidation achieved? Through aeration alone or by chemical oxidation via chlorine,
Potassium permanganate, ozone or chlorine dioxide
