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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. Headloss change over time
Low BOD - High suspended solids - no control - does not match limits`
Particle in a medium - they don't interact with other particles
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Chemically - Aerobically - Anaerobically

2. CL catch 22
Cheap - low biosolids - resistant to shock - simple
No residual
RMS velocity gradient
Want pH high for corrosion but lower for HOCL

3. Purpose of Floculation
Turn a large number of small particles into a small number of large particles
Last chance to remove particles
Remove all flocculated particles
Discrete - floculation - hindered - compression

4. Compression Settling
Acts like a sponge - water moves around particles
Floating upside down
Residual at tap
Remove viruses and bacteria that slipped through filter

5. Disinfection
Easy/Costly hard to dewater
Remove viruses and bacteria that slipped through filter
Remove the dead pigs - stuff that would hurt the pumps
Big Partices Catch little ones

6. Primary clarifier uses _____ removes _____
Discrete - floculation - hindered - compression
No residual
Sedimentation - suspended solids
Cheap - low biosolids - resistant to shock - simple

7. Sedimentation
Not in my back yard - nutrient overload - crops
Floating upside down
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Remove all flocculated particles

8. Goal for drinking water disinfection
Always the same dose needed - but that dose is higher
High pH and cold is bad
Discrete - floculation - hindered - compression
Residual at tap

9. Disadvantages of trickling
Sedimentation - suspended solids
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`
De watering - belt press and centrifuge

10. Enmeshment in Sweep Floc
Particle in a medium - they don't interact with other particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Very pH dependent - grab pieces
Forms clear interface between particles and supernatant( big word) - particles move around the water

11. What is thickening - name 2 ways
High pH and cold is bad
De watering - belt press and centrifuge
Floating upside down
Forms clear interface between particles and supernatant( big word) - particles move around the water

12. Discrete Sedimentation

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13. Hinderded Settling
Optimal dose depends on charge and concentration
Chemically - Aerobically - Anaerobically
Need enough to make it happen - don't shear the floc though
Forms clear interface between particles and supernatant( big word) - particles move around the water

14. Purpose of sedimentation in waste water
Cheap - low biosolids - resistant to shock - simple
OCL
Remove as many organic and non organic particles as possible
Sedimentation - suspended solids

15. What is special about chloramine
Cheap - low biosolids - resistant to shock - simple
Optimal dose depends on charge and concentration
Remove viruses and bacteria that slipped through filter
Always the same dose needed - but that dose is higher

16. where is the break point in chlorination and what happens after
Floating upside down
The second dip in the graph - free chlorine is formed
De watering - belt press and centrifuge
Fixed films

17. Flocuation settling
Last chance to remove particles
Settling of floculant particles
Remove all flocculated particles
Sedimentation - suspended solids

18. Adsorption and Charge Nuetralization
Always the same dose needed - but that dose is higher
Discrete - floculation - hindered - compression
Optimal dose depends on charge and concentration
The second dip in the graph - free chlorine is formed

19. Goal for wastewater disinfection
No residual
High pH and cold is bad
Not in my back yard - nutrient overload - crops
High Molecular Weight Synthetics

20. Higher pH gives more
OCL
Want pH high for corrosion but lower for HOCL
Acts like a sponge - water moves around particles
Particle in a medium - they don't interact with other particles

21. Advantage of trickling filter
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Cheap - low biosolids - resistant to shock - simple
No residual
De watering - belt press and centrifuge

22. 4 types of sedimentation
Optimal dose depends on charge and concentration
Need enough to make it happen - don't shear the floc though
Floating upside down
Discrete - floculation - hindered - compression

23. Point of pre treatment
Remove all flocculated particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Remove as many organic and non organic particles as possible
Remove the dead pigs - stuff that would hurt the pumps

24. filtration is the...
Sedimentation - suspended solids
Last chance to remove particles
Particle in a medium - they don't interact with other particles
Want pH high for corrosion but lower for HOCL

25. Bridging
High Molecular Weight Synthetics
Need enough to make it happen - don't shear the floc though
Remove the dead pigs - stuff that would hurt the pumps
Fixed films

26. Land applicatioin worries
Optimal dose depends on charge and concentration
Acts like a sponge - water moves around particles
Remove the dead pigs - stuff that would hurt the pumps
Not in my back yard - nutrient overload - crops

27. What is the effect of temperature and pH
High pH and cold is bad
Remove the dead pigs - stuff that would hurt the pumps
Remove all flocculated particles
Last chance to remove particles

28. Secondary Clairfier removes _____
OCL
Floating upside down
Fixed films
Not in my back yard - nutrient overload - crops

29. Stabilization 3 ways
Chemically - Aerobically - Anaerobically
No residual
Residual at tap
Turn a large number of small particles into a small number of large particles

30. G
RMS velocity gradient
Forms clear interface between particles and supernatant( big word) - particles move around the water
The second dip in the graph - free chlorine is formed
Always the same dose needed - but that dose is higher

31. Differential Sedimentatioin
Remove all flocculated particles
Always the same dose needed - but that dose is higher
No residual
Big Partices Catch little ones

32. 4 mechanisms
High pH and cold is bad
Sedimentation - suspended solids
The second dip in the graph - free chlorine is formed
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

33. Advantage/Disadvantage of Aerobic digestion
Chemically - Aerobically - Anaerobically
Very pH dependent - grab pieces
Add salt
Easy/Costly hard to dewater

34. Dichotomy of energy level for floculation

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35. Purpose of sedimentation in drinking water
Big Partices Catch little ones
OCL
Forms clear interface between particles and supernatant( big word) - particles move around the water
Remove all flocculated particles

36. Compress double layer
Add salt
Particle in a medium - they don't interact with other particles
Acts like a sponge - water moves around particles
Low BOD - High suspended solids - no control - does not match limits`