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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. Goal for wastewater disinfection
OCL
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
No residual
Remove as many organic and non organic particles as possible

2. Secondary Clairfier removes _____
Fixed films
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Sedimentation - suspended solids
Add salt

3. Land applicatioin worries
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Acts like a sponge - water moves around particles
Not in my back yard - nutrient overload - crops
Remove as many organic and non organic particles as possible

4. Headloss change over time
RMS velocity gradient
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Want pH high for corrosion but lower for HOCL
Residual at tap

5. Goal for drinking water disinfection
Add salt
High pH and cold is bad
Residual at tap
OCL

6. Compress double layer
OCL
Add salt
Acts like a sponge - water moves around particles
Big Partices Catch little ones

7. Compression Settling
Very pH dependent - grab pieces
Acts like a sponge - water moves around particles
Chemically - Aerobically - Anaerobically
Particle in a medium - they don't interact with other particles

8. Bridging
OCL
Add salt
High Molecular Weight Synthetics
Sedimentation - suspended solids

9. Primary clarifier uses _____ removes _____
Sedimentation - suspended solids
No residual
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Residual at tap

10. Advantage/Disadvantage of Aerobic digestion
Easy/Costly hard to dewater
Optimal dose depends on charge and concentration
Remove as many organic and non organic particles as possible
Not in my back yard - nutrient overload - crops

11. Sedimentation
Cheap - low biosolids - resistant to shock - simple
Want pH high for corrosion but lower for HOCL
Floating upside down
Remove as many organic and non organic particles as possible

12. Purpose of Floculation
Acts like a sponge - water moves around particles
Need enough to make it happen - don't shear the floc though
Turn a large number of small particles into a small number of large particles
Last chance to remove particles

13. where is the break point in chlorination and what happens after
Optimal dose depends on charge and concentration
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
The second dip in the graph - free chlorine is formed
RMS velocity gradient

14. What is special about chloramine
OCL
The second dip in the graph - free chlorine is formed
Big Partices Catch little ones
Always the same dose needed - but that dose is higher

15. Enmeshment in Sweep Floc
Remove the dead pigs - stuff that would hurt the pumps
Very pH dependent - grab pieces
De watering - belt press and centrifuge
Fixed films

16. 4 mechanisms
No residual
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Need enough to make it happen - don't shear the floc though
Easy/Costly hard to dewater

17. Purpose of sedimentation in drinking water
Remove all flocculated particles
Easy/Costly hard to dewater
Need enough to make it happen - don't shear the floc though
Big Partices Catch little ones

18. What is thickening - name 2 ways
De watering - belt press and centrifuge
The second dip in the graph - free chlorine is formed
OCL
Not in my back yard - nutrient overload - crops

19. Differential Sedimentatioin
OCL
Big Partices Catch little ones
RMS velocity gradient
De watering - belt press and centrifuge

20. Advantage of trickling filter
Want pH high for corrosion but lower for HOCL
Cheap - low biosolids - resistant to shock - simple
Optimal dose depends on charge and concentration
No residual

21. Hinderded Settling
Remove all flocculated particles
Forms clear interface between particles and supernatant( big word) - particles move around the water
Last chance to remove particles
High pH and cold is bad

22. Point of pre treatment
Remove the dead pigs - stuff that would hurt the pumps
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
De watering - belt press and centrifuge

23. Disinfection
Remove viruses and bacteria that slipped through filter
Remove all flocculated particles
Last chance to remove particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

24. Stabilization 3 ways
Cheap - low biosolids - resistant to shock - simple
De watering - belt press and centrifuge
Chemically - Aerobically - Anaerobically
Forms clear interface between particles and supernatant( big word) - particles move around the water

25. Discrete Sedimentation

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26. G
High pH and cold is bad
Acts like a sponge - water moves around particles
RMS velocity gradient
Not in my back yard - nutrient overload - crops

27. Disadvantages of trickling
No residual
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
High pH and cold is bad

28. 4 types of sedimentation
Particle in a medium - they don't interact with other particles
Very pH dependent - grab pieces
Not in my back yard - nutrient overload - crops
Discrete - floculation - hindered - compression

29. Purpose of sedimentation in waste water
Remove the dead pigs - stuff that would hurt the pumps
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Particle in a medium - they don't interact with other particles
Remove as many organic and non organic particles as possible

30. Dichotomy of energy level for floculation

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31. filtration is the...
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Big Partices Catch little ones
Last chance to remove particles
Low BOD - High suspended solids - no control - does not match limits`

32. Adsorption and Charge Nuetralization
Turn a large number of small particles into a small number of large particles
Optimal dose depends on charge and concentration
Forms clear interface between particles and supernatant( big word) - particles move around the water
OCL

33. Flocuation settling
Low BOD - High suspended solids - no control - does not match limits`
RMS velocity gradient
Settling of floculant particles
Floating upside down

34. Higher pH gives more
Last chance to remove particles
OCL
Settling of floculant particles
Floating upside down

35. CL catch 22
Very pH dependent - grab pieces
Discrete - floculation - hindered - compression
Want pH high for corrosion but lower for HOCL
Acts like a sponge - water moves around particles

36. What is the effect of temperature and pH
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
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
High pH and cold is bad