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Environmental Engineering 2

Instructions:

Answer 36 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Advantage/Disadvantage of Aerobic digestion
Residual at tap
Easy/Costly hard to dewater
Forms clear interface between particles and supernatant( big word) - particles move around the water
High pH and cold is bad

2. Goal for drinking water disinfection
Not in my back yard - nutrient overload - crops
Need enough to make it happen - don't shear the floc though
Easy/Costly hard to dewater
Residual at tap

3. Disinfection
The second dip in the graph - free chlorine is formed
Forms clear interface between particles and supernatant( big word) - particles move around the water
Optimal dose depends on charge and concentration
Remove viruses and bacteria that slipped through filter

4. Dichotomy of energy level for floculation

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5. Flocuation settling
Settling of floculant particles
Discrete - floculation - hindered - compression
Optimal dose depends on charge and concentration
Chemically - Aerobically - Anaerobically

6. Land applicatioin worries
Chemically - Aerobically - Anaerobically
High pH and cold is bad
Last chance to remove particles
Not in my back yard - nutrient overload - crops

7. CL catch 22
Always the same dose needed - but that dose is higher
Want pH high for corrosion but lower for HOCL
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
The second dip in the graph - free chlorine is formed

8. Stabilization 3 ways
Acts like a sponge - water moves around particles
Chemically - Aerobically - Anaerobically
Remove viruses and bacteria that slipped through filter
Turn a large number of small particles into a small number of large particles

9. where is the break point in chlorination and what happens after
The second dip in the graph - free chlorine is formed
Optimal dose depends on charge and concentration
De watering - belt press and centrifuge
Need enough to make it happen - don't shear the floc though

10. Point of pre treatment
Need enough to make it happen - don't shear the floc though
Remove the dead pigs - stuff that would hurt the pumps
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Chemically - Aerobically - Anaerobically

11. G
Need enough to make it happen - don't shear the floc though
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
RMS velocity gradient
Remove viruses and bacteria that slipped through filter

12. Secondary Clairfier removes _____
Want pH high for corrosion but lower for HOCL
Sedimentation - suspended solids
Very pH dependent - grab pieces
Fixed films

13. Compress double layer
Add salt
Discrete - floculation - hindered - compression
Cheap - low biosolids - resistant to shock - simple
Remove as many organic and non organic particles as possible

14. Compression Settling
High Molecular Weight Synthetics
Acts like a sponge - water moves around particles
Cheap - low biosolids - resistant to shock - simple
The second dip in the graph - free chlorine is formed

15. Differential Sedimentatioin
Low BOD - High suspended solids - no control - does not match limits`
High pH and cold is bad
Big Partices Catch little ones
Last chance to remove particles

16. Bridging
RMS velocity gradient
Want pH high for corrosion but lower for HOCL
Not in my back yard - nutrient overload - crops
High Molecular Weight Synthetics

17. What is special about chloramine
Chemically - Aerobically - Anaerobically
Remove viruses and bacteria that slipped through filter
The second dip in the graph - free chlorine is formed
Always the same dose needed - but that dose is higher

18. What is the effect of temperature and pH
High pH and cold is bad
No residual
Acts like a sponge - water moves around particles
Big Partices Catch little ones

19. Primary clarifier uses _____ removes _____
Sedimentation - suspended solids
Settling of floculant particles
De watering - belt press and centrifuge
Low BOD - High suspended solids - no control - does not match limits`

20. Disadvantages of trickling
Sedimentation - suspended solids
Low BOD - High suspended solids - no control - does not match limits`
Turn a large number of small particles into a small number of large particles
Fixed films

21. Advantage of trickling filter
Cheap - low biosolids - resistant to shock - simple
Easy/Costly hard to dewater
RMS velocity gradient
Acts like a sponge - water moves around particles

22. 4 mechanisms
Remove as many organic and non organic particles as possible
Residual at tap
Need enough to make it happen - don't shear the floc though
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

23. Adsorption and Charge Nuetralization
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Low BOD - High suspended solids - no control - does not match limits`
Remove the dead pigs - stuff that would hurt the pumps
Optimal dose depends on charge and concentration

24. Enmeshment in Sweep Floc
Want pH high for corrosion but lower for HOCL
Floating upside down
Last chance to remove particles
Very pH dependent - grab pieces

25. Sedimentation
Floating upside down
High pH and cold is bad
Acts like a sponge - water moves around particles
Not in my back yard - nutrient overload - crops

26. Goal for wastewater disinfection
No residual
De watering - belt press and centrifuge
Easy/Costly hard to dewater
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

27. Discrete Sedimentation

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28. Purpose of sedimentation in drinking water
Sedimentation - suspended solids
Acts like a sponge - water moves around particles
Want pH high for corrosion but lower for HOCL
Remove all flocculated particles

29. Hinderded Settling
Last chance to remove particles
OCL
Residual at tap
Forms clear interface between particles and supernatant( big word) - particles move around the water

30. Purpose of sedimentation in waste water
Remove the dead pigs - stuff that would hurt the pumps
Cheap - low biosolids - resistant to shock - simple
Remove as many organic and non organic particles as possible
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

31. 4 types of sedimentation
Discrete - floculation - hindered - compression
High pH and cold is bad
Not in my back yard - nutrient overload - crops
Remove as many organic and non organic particles as possible

32. filtration is the...
Floating upside down
Forms clear interface between particles and supernatant( big word) - particles move around the water
RMS velocity gradient
Last chance to remove particles

33. Higher pH gives more
OCL
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Remove viruses and bacteria that slipped through filter
Remove all flocculated particles

34. Headloss change over time
Always the same dose needed - but that dose is higher
High pH and cold is bad
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Last chance to remove particles

35. What is thickening - name 2 ways
De watering - belt press and centrifuge
Forms clear interface between particles and supernatant( big word) - particles move around the water
Not in my back yard - nutrient overload - crops
Last chance to remove particles

36. Purpose of Floculation
High Molecular Weight Synthetics
Turn a large number of small particles into a small number of large particles
Big Partices Catch little ones
Easy/Costly hard to dewater