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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. Purpose of sedimentation in drinking water
Discrete - floculation - hindered - compression
Remove all flocculated particles
The second dip in the graph - free chlorine is formed
RMS velocity gradient

2. Advantage of trickling filter
Cheap - low biosolids - resistant to shock - simple
Always the same dose needed - but that dose is higher
Discrete - floculation - hindered - compression
The second dip in the graph - free chlorine is formed

3. Flocuation settling
The second dip in the graph - free chlorine is formed
High Molecular Weight Synthetics
Fixed films
Settling of floculant particles

4. Disadvantages of trickling
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Need enough to make it happen - don't shear the floc though
Particle in a medium - they don't interact with other particles
Low BOD - High suspended solids - no control - does not match limits`

5. Higher pH gives more
RMS velocity gradient
Remove viruses and bacteria that slipped through filter
OCL
De watering - belt press and centrifuge

6. Sedimentation
Floating upside down
High Molecular Weight Synthetics
Always the same dose needed - but that dose is higher
RMS velocity gradient

7. What is the effect of temperature and pH
Low BOD - High suspended solids - no control - does not match limits`
Need enough to make it happen - don't shear the floc though
High pH and cold is bad
Cheap - low biosolids - resistant to shock - simple

8. Purpose of Floculation
Turn a large number of small particles into a small number of large particles
Big Partices Catch little ones
The second dip in the graph - free chlorine is formed
Fixed films

9. Dichotomy of energy level for floculation

10. Compress double layer
Forms clear interface between particles and supernatant( big word) - particles move around the water
Particle in a medium - they don't interact with other particles
The second dip in the graph - free chlorine is formed
Add salt

11. Goal for drinking water disinfection
The second dip in the graph - free chlorine is formed
Turn a large number of small particles into a small number of large particles
Residual at tap
Remove viruses and bacteria that slipped through filter

12. Primary clarifier uses _____ removes _____
OCL
Remove as many organic and non organic particles as possible
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Sedimentation - suspended solids

13. Differential Sedimentatioin
Floating upside down
Add salt
Not in my back yard - nutrient overload - crops
Big Partices Catch little ones

14. CL catch 22
Easy/Costly hard to dewater
Discrete - floculation - hindered - compression
Want pH high for corrosion but lower for HOCL
Floating upside down

15. filtration is the...
De watering - belt press and centrifuge
RMS velocity gradient
Remove viruses and bacteria that slipped through filter
Last chance to remove particles

16. What is thickening - name 2 ways
No residual
OCL
De watering - belt press and centrifuge
High Molecular Weight Synthetics

17. Secondary Clairfier removes _____
Very pH dependent - grab pieces
Remove all flocculated particles
Fixed films
No residual

18. Bridging
Remove all flocculated particles
No residual
High Molecular Weight Synthetics
Settling of floculant particles

19. Stabilization 3 ways
Chemically - Aerobically - Anaerobically
Remove as many organic and non organic particles as possible
Discrete - floculation - hindered - compression
Remove all flocculated particles

20. 4 mechanisms
RMS velocity gradient
Big Partices Catch little ones
Last chance to remove particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

21. Land applicatioin worries
Fixed films
Floating upside down
Remove all flocculated particles
Not in my back yard - nutrient overload - crops

22. Headloss change over time
Want pH high for corrosion but lower for HOCL
Big Partices Catch little ones
Acts like a sponge - water moves around particles
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

23. Advantage/Disadvantage of Aerobic digestion
High pH and cold is bad
Chemically - Aerobically - Anaerobically
Always the same dose needed - but that dose is higher
Easy/Costly hard to dewater

24. 4 types of sedimentation
Residual at tap
Discrete - floculation - hindered - compression
Sedimentation - suspended solids
De watering - belt press and centrifuge

25. Point of pre treatment
Remove the dead pigs - stuff that would hurt the pumps
Optimal dose depends on charge and concentration
Floating upside down
OCL

26. Compression Settling
Acts like a sponge - water moves around particles
Floating upside down
Very pH dependent - grab pieces
Turn a large number of small particles into a small number of large particles

27. What is special about chloramine
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Cheap - low biosolids - resistant to shock - simple
De watering - belt press and centrifuge
Always the same dose needed - but that dose is higher

28. Adsorption and Charge Nuetralization
Optimal dose depends on charge and concentration
Floating upside down
Acts like a sponge - water moves around particles
Low BOD - High suspended solids - no control - does not match limits`

29. Goal for wastewater disinfection
Fixed films
Forms clear interface between particles and supernatant( big word) - particles move around the water
No residual
Settling of floculant particles

30. Purpose of sedimentation in waste water
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Easy/Costly hard to dewater
De watering - belt press and centrifuge
Remove as many organic and non organic particles as possible

31. Disinfection
Remove viruses and bacteria that slipped through filter
High pH and cold is bad
Optimal dose depends on charge and concentration
Add salt

32. Discrete Sedimentation

33. where is the break point in chlorination and what happens after
Remove all flocculated particles
The second dip in the graph - free chlorine is formed
Fixed films
Easy/Costly hard to dewater

34. Enmeshment in Sweep Floc
Low BOD - High suspended solids - no control - does not match limits`
Very pH dependent - grab pieces
Easy/Costly hard to dewater
High pH and cold is bad

35. G
Remove as many organic and non organic particles as possible
Floating upside down
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
RMS velocity gradient

36. Hinderded Settling
Sedimentation - suspended solids
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Forms clear interface between particles and supernatant( big word) - particles move around the water
Floating upside down