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Environmental Engineering 2

Instructions:

Answer 36 questions in 15 minutes.
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Match each statement with the correct term.
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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. Disinfection
High pH and cold is bad
Low BOD - High suspended solids - no control - does not match limits`
Remove viruses and bacteria that slipped through filter
RMS velocity gradient

2. Disadvantages of trickling
Low BOD - High suspended solids - no control - does not match limits`
Remove all flocculated particles
Chemically - Aerobically - Anaerobically
De watering - belt press and centrifuge

3. What is the effect of temperature and pH
High pH and cold is bad
Big Partices Catch little ones
Fixed films
Remove the dead pigs - stuff that would hurt the pumps

4. Primary clarifier uses _____ removes _____
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Sedimentation - suspended solids
Cheap - low biosolids - resistant to shock - simple
Particle in a medium - they don't interact with other particles

5. Secondary Clairfier removes _____
Fixed films
Always the same dose needed - but that dose is higher
Not in my back yard - nutrient overload - crops
De watering - belt press and centrifuge

6. 4 mechanisms
Remove the dead pigs - stuff that would hurt the pumps
Low BOD - High suspended solids - no control - does not match limits`
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Last chance to remove particles

7. Headloss change over time
Remove all flocculated particles
Settling of floculant particles
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Easy/Costly hard to dewater

8. Adsorption and Charge Nuetralization
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
High pH and cold is bad
Optimal dose depends on charge and concentration
Want pH high for corrosion but lower for HOCL

9. Differential Sedimentatioin
Cheap - low biosolids - resistant to shock - simple
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Big Partices Catch little ones
Residual at tap

10. where is the break point in chlorination and what happens after
The second dip in the graph - free chlorine is formed
Forms clear interface between particles and supernatant( big word) - particles move around the water
No residual
Residual at tap

11. CL catch 22
Optimal dose depends on charge and concentration
Want pH high for corrosion but lower for HOCL
No residual
Big Partices Catch little ones

12. Advantage/Disadvantage of Aerobic digestion
Optimal dose depends on charge and concentration
RMS velocity gradient
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Easy/Costly hard to dewater

13. What is special about chloramine
OCL
Last chance to remove particles
Always the same dose needed - but that dose is higher
Remove as many organic and non organic particles as possible

14. filtration is the...
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Turn a large number of small particles into a small number of large particles
No residual
Last chance to remove particles

15. Goal for drinking water disinfection
Turn a large number of small particles into a small number of large particles
Low BOD - High suspended solids - no control - does not match limits`
Last chance to remove particles
Residual at tap

16. Sedimentation
Cheap - low biosolids - resistant to shock - simple
Floating upside down
Need enough to make it happen - don't shear the floc though
No residual

17. Enmeshment in Sweep Floc
Low BOD - High suspended solids - no control - does not match limits`
Big Partices Catch little ones
Remove as many organic and non organic particles as possible
Very pH dependent - grab pieces

18. Hinderded Settling
De watering - belt press and centrifuge
Residual at tap
Forms clear interface between particles and supernatant( big word) - particles move around the water
Settling of floculant particles

19. Higher pH gives more
OCL
RMS velocity gradient
Add salt
Settling of floculant particles

20. 4 types of sedimentation
Settling of floculant particles
OCL
Discrete - floculation - hindered - compression
Particle in a medium - they don't interact with other particles

21. Bridging
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High Molecular Weight Synthetics
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
High pH and cold is bad

22. Dichotomy of energy level for floculation

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23. Advantage of trickling filter
Particle in a medium - they don't interact with other particles
Sedimentation - suspended solids
No residual
Cheap - low biosolids - resistant to shock - simple

24. Goal for wastewater disinfection
Need enough to make it happen - don't shear the floc though
Remove all flocculated particles
Add salt
No residual

25. Compression Settling
Acts like a sponge - water moves around particles
The second dip in the graph - free chlorine is formed
Remove viruses and bacteria that slipped through filter
Always the same dose needed - but that dose is higher

26. Compress double layer
Residual at tap
Low BOD - High suspended solids - no control - does not match limits`
Sedimentation - suspended solids
Add salt

27. Flocuation settling
Cheap - low biosolids - resistant to shock - simple
Residual at tap
Easy/Costly hard to dewater
Settling of floculant particles

28. Land applicatioin worries
The second dip in the graph - free chlorine is formed
Not in my back yard - nutrient overload - crops
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Settling of floculant particles

29. Purpose of sedimentation in drinking water
Remove all flocculated particles
Settling of floculant particles
Easy/Costly hard to dewater
Always the same dose needed - but that dose is higher

30. Purpose of Floculation
Always the same dose needed - but that dose is higher
Turn a large number of small particles into a small number of large particles
Remove the dead pigs - stuff that would hurt the pumps
The second dip in the graph - free chlorine is formed

31. G
RMS velocity gradient
Not in my back yard - nutrient overload - crops
Sedimentation - suspended solids
Remove the dead pigs - stuff that would hurt the pumps

32. What is thickening - name 2 ways
De watering - belt press and centrifuge
Discrete - floculation - hindered - compression
OCL
Cheap - low biosolids - resistant to shock - simple

33. Discrete Sedimentation

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34. Point of pre treatment
High pH and cold is bad
Settling of floculant particles
Remove the dead pigs - stuff that would hurt the pumps
High Molecular Weight Synthetics

35. Stabilization 3 ways
Remove as many organic and non organic particles as possible
Chemically - Aerobically - Anaerobically
The second dip in the graph - free chlorine is formed
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

36. Purpose of sedimentation in waste water
OCL
Remove as many organic and non organic particles as possible
RMS velocity gradient
Floating upside down

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Environmental Engineering 2

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