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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. Bridging
High pH and cold is bad
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
Discrete - floculation - hindered - compression

2. Purpose of Floculation
Turn a large number of small particles into a small number of large particles
Very pH dependent - grab pieces
No residual
Want pH high for corrosion but lower for HOCL

3. Flocuation settling
RMS velocity gradient
Very pH dependent - grab pieces
Fixed films
Settling of floculant particles

4. Headloss change over time
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`
Chemically - Aerobically - Anaerobically
Remove all flocculated particles

5. G
Remove viruses and bacteria that slipped through filter
RMS velocity gradient
Settling of floculant particles
Add salt

6. Purpose of sedimentation in waste water
De watering - belt press and centrifuge
Chemically - Aerobically - Anaerobically
Fixed films
Remove as many organic and non organic particles as possible

7. Compress double layer
Remove all flocculated particles
Add salt
Optimal dose depends on charge and concentration
Cheap - low biosolids - resistant to shock - simple

8. CL catch 22
Need enough to make it happen - don't shear the floc though
Always the same dose needed - but that dose is higher
Want pH high for corrosion but lower for HOCL
Chemically - Aerobically - Anaerobically

9. Hinderded Settling
Forms clear interface between particles and supernatant( big word) - particles move around the water
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
Want pH high for corrosion but lower for HOCL

10. 4 mechanisms
Particle in a medium - they don't interact with other particles
Always the same dose needed - but that dose is higher
Acts like a sponge - water moves around particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

11. filtration is the...
Always the same dose needed - but that dose is higher
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Last chance to remove particles
De watering - belt press and centrifuge

12. Goal for wastewater disinfection
Always the same dose needed - but that dose is higher
Low BOD - High suspended solids - no control - does not match limits`
No residual
RMS velocity gradient

13. Disinfection
Remove as many organic and non organic particles as possible
Chemically - Aerobically - Anaerobically
Big Partices Catch little ones
Remove viruses and bacteria that slipped through filter

14. Adsorption and Charge Nuetralization
Settling of floculant particles
Big Partices Catch little ones
Optimal dose depends on charge and concentration
Particle in a medium - they don't interact with other particles

15. Enmeshment in Sweep Floc
OCL
High Molecular Weight Synthetics
Very pH dependent - grab pieces
Big Partices Catch little ones

16. Dichotomy of energy level for floculation

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17. Advantage/Disadvantage of Aerobic digestion
Floating upside down
Easy/Costly hard to dewater
Forms clear interface between particles and supernatant( big word) - particles move around the water
Want pH high for corrosion but lower for HOCL

18. Disadvantages of trickling
Very pH dependent - grab pieces
Sedimentation - suspended solids
Want pH high for corrosion but lower for HOCL
Low BOD - High suspended solids - no control - does not match limits`

19. Differential Sedimentatioin
Always the same dose needed - but that dose is higher
Big Partices Catch little ones
High pH and cold is bad
Add salt

20. Goal for drinking water disinfection
RMS velocity gradient
Low BOD - High suspended solids - no control - does not match limits`
Residual at tap
Discrete - floculation - hindered - compression

21. Sedimentation
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
RMS velocity gradient
Floating upside down

22. Secondary Clairfier removes _____
Not in my back yard - nutrient overload - crops
Fixed films
Remove all flocculated particles
Cheap - low biosolids - resistant to shock - simple

23. Discrete Sedimentation

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24. Purpose of sedimentation in drinking water
Remove all flocculated particles
Settling of floculant particles
Very pH dependent - grab pieces
Discrete - floculation - hindered - compression

25. Land applicatioin worries
Remove the dead pigs - stuff that would hurt the pumps
Last chance to remove particles
Not in my back yard - nutrient overload - crops
Want pH high for corrosion but lower for HOCL

26. Advantage of trickling filter
No residual
Turn a large number of small particles into a small number of large particles
Cheap - low biosolids - resistant to shock - simple
Residual at tap

27. Compression Settling
Acts like a sponge - water moves around particles
Remove as many organic and non organic particles as possible
Discrete - floculation - hindered - compression
Particle in a medium - they don't interact with other particles

28. Stabilization 3 ways
Add salt
Not in my back yard - nutrient overload - crops
Chemically - Aerobically - Anaerobically
Turn a large number of small particles into a small number of large particles

29. 4 types of sedimentation
High Molecular Weight Synthetics
Optimal dose depends on charge and concentration
Discrete - floculation - hindered - compression
Sedimentation - suspended solids

30. where is the break point in chlorination and what happens after
The second dip in the graph - free chlorine is formed
Fixed films
Not in my back yard - nutrient overload - crops
Acts like a sponge - water moves around particles

31. What is special about chloramine
Settling of floculant particles
Optimal dose depends on charge and concentration
Remove as many organic and non organic particles as possible
Always the same dose needed - but that dose is higher

32. Primary clarifier uses _____ removes _____
The second dip in the graph - free chlorine is formed
Optimal dose depends on charge and concentration
De watering - belt press and centrifuge
Sedimentation - suspended solids

33. Point of pre treatment
Big Partices Catch little ones
Remove all flocculated particles
Remove the dead pigs - stuff that would hurt the pumps
Floating upside down

34. What is thickening - name 2 ways
Last chance to remove particles
High pH and cold is bad
De watering - belt press and centrifuge
Remove as many organic and non organic particles as possible

35. What is the effect of temperature and pH
Remove as many organic and non organic particles as possible
De watering - belt press and centrifuge
High pH and cold is bad
Chemically - Aerobically - Anaerobically

36. Higher pH gives more
Floating upside down
Remove the dead pigs - stuff that would hurt the pumps
Chemically - Aerobically - Anaerobically
OCL