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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. Higher pH gives more
Last chance to remove particles
OCL
Remove as many organic and non organic particles as possible
Low BOD - High suspended solids - no control - does not match limits`

2. Goal for wastewater disinfection
Last chance to remove particles
Very pH dependent - grab pieces
Turn a large number of small particles into a small number of large particles
No residual

3. Secondary Clairfier removes _____
Chemically - Aerobically - Anaerobically
Acts like a sponge - water moves around particles
Low BOD - High suspended solids - no control - does not match limits`
Fixed films

4. Headloss change over time
Residual at tap
Turn a large number of small particles into a small number of large particles
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Remove all flocculated particles

5. What is the effect of temperature and pH
High pH and cold is bad
Turn a large number of small particles into a small number of large particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Add salt

6. CL catch 22
Big Partices Catch little ones
High pH and cold is bad
Chemically - Aerobically - Anaerobically
Want pH high for corrosion but lower for HOCL

7. 4 mechanisms
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Remove as many organic and non organic particles as possible
Very pH dependent - grab pieces

8. where is the break point in chlorination and what happens after
Big Partices Catch little ones
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Discrete - floculation - hindered - compression
The second dip in the graph - free chlorine is formed

9. Advantage of trickling filter
Cheap - low biosolids - resistant to shock - simple
Low BOD - High suspended solids - no control - does not match limits`
OCL
Turn a large number of small particles into a small number of large particles

10. Disadvantages of trickling
Sedimentation - suspended solids
Low BOD - High suspended solids - no control - does not match limits`
Easy/Costly hard to dewater
Last chance to remove particles

11. Purpose of sedimentation in waste water
Need enough to make it happen - don't shear the floc though
Remove as many organic and non organic particles as possible
Always the same dose needed - but that dose is higher
Want pH high for corrosion but lower for HOCL

12. Advantage/Disadvantage of Aerobic digestion
Add salt
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
Residual at tap

13. Primary clarifier uses _____ removes _____
Fixed films
Remove the dead pigs - stuff that would hurt the pumps
Sedimentation - suspended solids
Always the same dose needed - but that dose is higher

14. Enmeshment in Sweep Floc
Very pH dependent - grab pieces
The second dip in the graph - free chlorine is formed
Discrete - floculation - hindered - compression
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

15. Adsorption and Charge Nuetralization
Want pH high for corrosion but lower for HOCL
Optimal dose depends on charge and concentration
Last chance to remove particles
Remove viruses and bacteria that slipped through filter

16. G
Remove as many organic and non organic particles as possible
No residual
Easy/Costly hard to dewater
RMS velocity gradient

17. Purpose of sedimentation in drinking water
Remove the dead pigs - stuff that would hurt the pumps
Easy/Costly hard to dewater
Remove all flocculated particles
No residual

18. Land applicatioin worries
Floating upside down
Residual at tap
Not in my back yard - nutrient overload - crops
Big Partices Catch little ones

19. Bridging
High pH and cold is bad
High Molecular Weight Synthetics
Cheap - low biosolids - resistant to shock - simple
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

20. Disinfection
Low BOD - High suspended solids - no control - does not match limits`
OCL
Acts like a sponge - water moves around particles
Remove viruses and bacteria that slipped through filter

21. Compress double layer
Last chance to remove particles
Add salt
Big Partices Catch little ones
Always the same dose needed - but that dose is higher

22. What is thickening - name 2 ways
High pH and cold is bad
Forms clear interface between particles and supernatant( big word) - particles move around the water
No residual
De watering - belt press and centrifuge

23. Flocuation settling
No residual
Settling of floculant particles
Acts like a sponge - water moves around particles
Particle in a medium - they don't interact with other particles

24. What is special about chloramine
The second dip in the graph - free chlorine is formed
Always the same dose needed - but that dose is higher
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
RMS velocity gradient

25. Hinderded Settling
Very pH dependent - grab pieces
High Molecular Weight Synthetics
Forms clear interface between particles and supernatant( big word) - particles move around the water
Discrete - floculation - hindered - compression

26. Stabilization 3 ways
Acts like a sponge - water moves around particles
OCL
De watering - belt press and centrifuge
Chemically - Aerobically - Anaerobically

27. Sedimentation
Add salt
Optimal dose depends on charge and concentration
Floating upside down
Always the same dose needed - but that dose is higher

28. Dichotomy of energy level for floculation

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29. Compression Settling
High Molecular Weight Synthetics
Cheap - low biosolids - resistant to shock - simple
Remove the dead pigs - stuff that would hurt the pumps
Acts like a sponge - water moves around particles

30. Purpose of Floculation
Chemically - Aerobically - Anaerobically
Cheap - low biosolids - resistant to shock - simple
Turn a large number of small particles into a small number of large particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

31. Goal for drinking water disinfection
Residual at tap
OCL
RMS velocity gradient
Remove the dead pigs - stuff that would hurt the pumps

32. Point of pre treatment
Remove the dead pigs - stuff that would hurt the pumps
Residual at tap
Fixed films
Discrete - floculation - hindered - compression

33. Discrete Sedimentation

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34. filtration is the...
Last chance to remove particles
OCL
Want pH high for corrosion but lower for HOCL
High pH and cold is bad

35. Differential Sedimentatioin
Big Partices Catch little ones
Turn a large number of small particles into a small number of large particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
The second dip in the graph - free chlorine is formed

36. 4 types of sedimentation
Need enough to make it happen - don't shear the floc though
Discrete - floculation - hindered - compression
Very pH dependent - grab pieces
Particle in a medium - they don't interact with other particles