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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. Primary clarifier uses _____ removes _____
Low BOD - High suspended solids - no control - does not match limits`
Residual at tap
Cheap - low biosolids - resistant to shock - simple
Sedimentation - suspended solids

2. filtration is the...
Last chance to remove particles
High Molecular Weight Synthetics
Sedimentation - suspended solids
Big Partices Catch little ones

3. Compress double layer
Fixed films
High Molecular Weight Synthetics
Add salt
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

4. Purpose of Floculation
Sedimentation - suspended solids
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Turn a large number of small particles into a small number of large particles
Acts like a sponge - water moves around particles

5. Advantage/Disadvantage of Aerobic digestion
Easy/Costly hard to dewater
Chemically - Aerobically - Anaerobically
Fixed films
High Molecular Weight Synthetics

6. Discrete Sedimentation

7. CL catch 22
Add salt
Not in my back yard - nutrient overload - crops
Want pH high for corrosion but lower for HOCL
Floating upside down

8. Adsorption and Charge Nuetralization
Need enough to make it happen - don't shear the floc though
Fixed films
Optimal dose depends on charge and concentration
Cheap - low biosolids - resistant to shock - simple

9. Differential Sedimentatioin
Remove the dead pigs - stuff that would hurt the pumps
Floating upside down
Fixed films
Big Partices Catch little ones

10. Compression Settling
Acts like a sponge - water moves around particles
Optimal dose depends on charge and concentration
Easy/Costly hard to dewater
Big Partices Catch little ones

11. Bridging
Easy/Costly hard to dewater
Cheap - low biosolids - resistant to shock - simple
High Molecular Weight Synthetics
Optimal dose depends on charge and concentration

12. Advantage of trickling filter
Optimal dose depends on charge and concentration
Remove the dead pigs - stuff that would hurt the pumps
Cheap - low biosolids - resistant to shock - simple
Residual at tap

13. Land applicatioin worries
Not in my back yard - nutrient overload - crops
Want pH high for corrosion but lower for HOCL
Remove the dead pigs - stuff that would hurt the pumps
Low BOD - High suspended solids - no control - does not match limits`

14. What is the effect of temperature and pH
Acts like a sponge - water moves around particles
Chemically - Aerobically - Anaerobically
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High pH and cold is bad

15. Dichotomy of energy level for floculation

16. 4 mechanisms
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Residual at tap
Acts like a sponge - water moves around particles
The second dip in the graph - free chlorine is formed

17. Flocuation settling
Forms clear interface between particles and supernatant( big word) - particles move around the water
Settling of floculant particles
Not in my back yard - nutrient overload - crops
Sedimentation - suspended solids

18. Higher pH gives more
Big Partices Catch little ones
OCL
RMS velocity gradient
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

19. Goal for wastewater disinfection
Remove viruses and bacteria that slipped through filter
No residual
Settling of floculant particles
Always the same dose needed - but that dose is higher

20. 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
High pH and cold is bad
Remove viruses and bacteria that slipped through filter
Floating upside down

21. What is special about chloramine
Easy/Costly hard to dewater
Always the same dose needed - but that dose is higher
Last chance to remove particles
De watering - belt press and centrifuge

22. Sedimentation
Floating upside down
Cheap - low biosolids - resistant to shock - simple
Remove the dead pigs - stuff that would hurt the pumps
High Molecular Weight Synthetics

23. Disinfection
Cheap - low biosolids - resistant to shock - simple
High Molecular Weight Synthetics
Remove viruses and bacteria that slipped through filter
Residual at tap

24. What is thickening - name 2 ways
De watering - belt press and centrifuge
Particle in a medium - they don't interact with other particles
Remove viruses and bacteria that slipped through filter
RMS velocity gradient

25. Hinderded Settling
OCL
Optimal dose depends on charge and concentration
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

26. G
Fixed films
No residual
RMS velocity gradient
Remove all flocculated particles

27. where is the break point in chlorination and what happens after
The second dip in the graph - free chlorine is formed
RMS velocity gradient
Want pH high for corrosion but lower for HOCL
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

28. Point of pre treatment
Remove the dead pigs - stuff that would hurt the pumps
Optimal dose depends on charge and concentration
Add salt
Sedimentation - suspended solids

29. Enmeshment in Sweep Floc
Discrete - floculation - hindered - compression
Fixed films
Very pH dependent - grab pieces
Not in my back yard - nutrient overload - crops

30. Stabilization 3 ways
Remove as many organic and non organic particles as possible
Chemically - Aerobically - Anaerobically
Add salt
Need enough to make it happen - don't shear the floc though

31. Secondary Clairfier removes _____
Easy/Costly hard to dewater
Fixed films
Low BOD - High suspended solids - no control - does not match limits`
Acts like a sponge - water moves around particles

32. Disadvantages of trickling
Easy/Costly hard to dewater
Need enough to make it happen - don't shear the floc though
Low BOD - High suspended solids - no control - does not match limits`
Cheap - low biosolids - resistant to shock - simple

33. Purpose of sedimentation in drinking water
Forms clear interface between particles and supernatant( big word) - particles move around the water
Remove all flocculated particles
Fixed films
Turn a large number of small particles into a small number of large particles

34. Purpose of sedimentation in waste water
High pH and cold is bad
Acts like a sponge - water moves around particles
Remove as many organic and non organic particles as possible
Optimal dose depends on charge and concentration

35. Goal for drinking water disinfection
Need enough to make it happen - don't shear the floc though
Chemically - Aerobically - Anaerobically
Residual at tap
Forms clear interface between particles and supernatant( big word) - particles move around the water

36. 4 types of sedimentation
Discrete - floculation - hindered - compression
Always the same dose needed - but that dose is higher
Remove all flocculated particles
Remove the dead pigs - stuff that would hurt the pumps