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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.
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. 4 types of sedimentation
Particle in a medium - they don't interact with other particles
Discrete - floculation - hindered - compression
Forms clear interface between particles and supernatant( big word) - particles move around the water
OCL

2. Land applicatioin worries
Low BOD - High suspended solids - no control - does not match limits`
Not in my back yard - nutrient overload - crops
Settling of floculant particles
Always the same dose needed - but that dose is higher

3. Compress double layer
Remove all flocculated particles
Add salt
Fixed films
Remove the dead pigs - stuff that would hurt the pumps

4. Dichotomy of energy level for floculation

5. Bridging
Low BOD - High suspended solids - no control - does not match limits`
Settling of floculant particles
High Molecular Weight Synthetics
Acts like a sponge - water moves around particles

6. What is special about chloramine
Always the same dose needed - but that dose is higher
Remove the dead pigs - stuff that would hurt the pumps
Fixed films
High Molecular Weight Synthetics

7. CL catch 22
Want pH high for corrosion but lower for HOCL
No residual
Cheap - low biosolids - resistant to shock - simple
Acts like a sponge - water moves around particles

8. Headloss change over time
OCL
Cheap - low biosolids - resistant to shock - simple
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

9. Purpose of Floculation
De watering - belt press and centrifuge
Want pH high for corrosion but lower for HOCL
Residual at tap
Turn a large number of small particles into a small number of large particles

10. 4 mechanisms
Last chance to remove particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High pH and cold is bad
Forms clear interface between particles and supernatant( big word) - particles move around the water

11. Enmeshment in Sweep Floc
High Molecular Weight Synthetics
Very pH dependent - grab pieces
Need enough to make it happen - don't shear the floc though
Always the same dose needed - but that dose is higher

12. Disadvantages of trickling
Need enough to make it happen - don't shear the floc though
Low BOD - High suspended solids - no control - does not match limits`
Easy/Costly hard to dewater
Forms clear interface between particles and supernatant( big word) - particles move around the water

13. Goal for wastewater disinfection
Optimal dose depends on charge and concentration
No residual
Particle in a medium - they don't interact with other particles
Remove all flocculated particles

14. What is the effect of temperature and pH
High pH and cold is bad
Optimal dose depends on charge and concentration
Remove all flocculated particles
Forms clear interface between particles and supernatant( big word) - particles move around the water

15. Primary clarifier uses _____ removes _____
Turn a large number of small particles into a small number of large particles
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
Sedimentation - suspended solids

16. Disinfection
Remove viruses and bacteria that slipped through filter
Sedimentation - suspended solids
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Not in my back yard - nutrient overload - crops

17. Purpose of sedimentation in drinking water
No residual
Turn a large number of small particles into a small number of large particles
Remove all flocculated particles
Chemically - Aerobically - Anaerobically

18. Hinderded Settling
Not in my back yard - nutrient overload - crops
High Molecular Weight Synthetics
Always the same dose needed - but that dose is higher
Forms clear interface between particles and supernatant( big word) - particles move around the water

19. Higher pH gives more
De watering - belt press and centrifuge
Cheap - low biosolids - resistant to shock - simple
Turn a large number of small particles into a small number of large particles
OCL

20. Adsorption and Charge Nuetralization
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High Molecular Weight Synthetics
Easy/Costly hard to dewater
Optimal dose depends on charge and concentration

21. Differential Sedimentatioin
Optimal dose depends on charge and concentration
Big Partices Catch little ones
Fixed films
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

22. G
Cheap - low biosolids - resistant to shock - simple
Particle in a medium - they don't interact with other particles
RMS velocity gradient
Last chance to remove particles

23. Secondary Clairfier removes _____
Acts like a sponge - water moves around particles
Last chance to remove particles
Fixed films
Optimal dose depends on charge and concentration

24. Discrete Sedimentation

25. Advantage of trickling filter
Cheap - low biosolids - resistant to shock - simple
Add salt
High pH and cold is bad
Discrete - floculation - hindered - compression

26. Goal for drinking water disinfection
Particle in a medium - they don't interact with other particles
Residual at tap
Fixed films
Settling of floculant particles

27. Compression Settling
Acts like a sponge - water moves around particles
Big Partices Catch little ones
The second dip in the graph - free chlorine is formed
Remove as many organic and non organic particles as possible

28. Sedimentation
Residual at tap
Big Partices Catch little ones
Floating upside down
Easy/Costly hard to dewater

29. Point of pre treatment
Remove the dead pigs - stuff that would hurt the pumps
Low BOD - High suspended solids - no control - does not match limits`
OCL
Optimal dose depends on charge and concentration

30. Stabilization 3 ways
Always the same dose needed - but that dose is higher
Big Partices Catch little ones
OCL
Chemically - Aerobically - Anaerobically

31. Advantage/Disadvantage of Aerobic digestion
Easy/Costly hard to dewater
Always the same dose needed - but that dose is higher
De watering - belt press and centrifuge
Remove the dead pigs - stuff that would hurt the pumps

32. What is thickening - name 2 ways
OCL
De watering - belt press and centrifuge
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Low BOD - High suspended solids - no control - does not match limits`

33. filtration is the...
Remove the dead pigs - stuff that would hurt the pumps
Residual at tap
Last chance to remove particles
Acts like a sponge - water moves around particles

34. Flocuation settling
Forms clear interface between particles and supernatant( big word) - particles move around the water
Add salt
Discrete - floculation - hindered - compression
Settling of floculant particles

35. Purpose of sedimentation in waste water
Turn a large number of small particles into a small number of large particles
Remove as many organic and non organic particles as possible
Not in my back yard - nutrient overload - crops
Want pH high for corrosion but lower for HOCL

36. where is the break point in chlorination and what happens after
High pH and cold is bad
High Molecular Weight Synthetics
Low BOD - High suspended solids - no control - does not match limits`
The second dip in the graph - free chlorine is formed

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Environmental Engineering 2

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