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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. Differential Sedimentatioin
The second dip in the graph - free chlorine is formed
Settling of floculant particles
Big Partices Catch little ones
Optimal dose depends on charge and concentration

2. Primary clarifier uses _____ removes _____
Sedimentation - suspended solids
Turn a large number of small particles into a small number of large particles
Forms clear interface between particles and supernatant( big word) - particles move around the water
Optimal dose depends on charge and concentration

3. Stabilization 3 ways
Chemically - Aerobically - Anaerobically
Big Partices Catch little ones
Optimal dose depends on charge and concentration
Particle in a medium - they don't interact with other particles

4. CL catch 22
Floating upside down
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Want pH high for corrosion but lower for HOCL
Acts like a sponge - water moves around particles

5. Enmeshment in Sweep Floc
De watering - belt press and centrifuge
Need enough to make it happen - don't shear the floc though
Very pH dependent - grab pieces
Cheap - low biosolids - resistant to shock - simple

6. Goal for drinking water disinfection
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
Settling of floculant particles
Residual at tap

7. Dichotomy of energy level for floculation

8. Advantage/Disadvantage of Aerobic digestion
Remove the dead pigs - stuff that would hurt the pumps
Easy/Costly hard to dewater
OCL
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

9. What is the effect of temperature and pH
De watering - belt press and centrifuge
Settling of floculant particles
Remove all flocculated particles
High pH and cold is bad

10. Disadvantages of trickling
Low BOD - High suspended solids - no control - does not match limits`
Remove viruses and bacteria that slipped through filter
The second dip in the graph - free chlorine is formed
High Molecular Weight Synthetics

11. Compress double layer
High Molecular Weight Synthetics
Optimal dose depends on charge and concentration
Add salt
Remove viruses and bacteria that slipped through filter

12. Bridging
High Molecular Weight Synthetics
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
Residual at tap

13. Purpose of Floculation
Turn a large number of small particles into a small number of large particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High pH and cold is bad
Cheap - low biosolids - resistant to shock - simple

14. Disinfection
Sedimentation - suspended solids
Remove viruses and bacteria that slipped through filter
De watering - belt press and centrifuge
Low BOD - High suspended solids - no control - does not match limits`

15. Headloss change over time
Remove as many organic and non organic particles as possible
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Last chance to remove particles
Need enough to make it happen - don't shear the floc though

16. Higher pH gives more
Very pH dependent - grab pieces
RMS velocity gradient
The second dip in the graph - free chlorine is formed
OCL

17. Land applicatioin worries
Remove the dead pigs - stuff that would hurt the pumps
Residual at tap
Not in my back yard - nutrient overload - crops
Chemically - Aerobically - Anaerobically

18. G
Optimal dose depends on charge and concentration
RMS velocity gradient
High Molecular Weight Synthetics
Chemically - Aerobically - Anaerobically

19. Hinderded Settling
Remove the dead pigs - stuff that would hurt the pumps
Floating upside down
Discrete - floculation - hindered - compression
Forms clear interface between particles and supernatant( big word) - particles move around the water

20. Purpose of sedimentation in drinking water
Remove all flocculated particles
Easy/Costly hard to dewater
De watering - belt press and centrifuge
Remove as many organic and non organic particles as possible

21. 4 types of sedimentation
Discrete - floculation - hindered - compression
Residual at tap
Add salt
Cheap - low biosolids - resistant to shock - simple

22. Secondary Clairfier removes _____
Turn a large number of small particles into a small number of large particles
Sedimentation - suspended solids
Fixed films
Need enough to make it happen - don't shear the floc though

23. Point of pre treatment
Particle in a medium - they don't interact with other particles
Remove the dead pigs - stuff that would hurt the pumps
Cheap - low biosolids - resistant to shock - simple
Remove all flocculated particles

24. Purpose of sedimentation in waste water
Remove as many organic and non organic particles as possible
Turn a large number of small particles into a small number of large particles
Floating upside down
Want pH high for corrosion but lower for HOCL

25. Advantage of trickling filter
Discrete - floculation - hindered - compression
Sedimentation - suspended solids
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Cheap - low biosolids - resistant to shock - simple

26. Sedimentation
Remove the dead pigs - stuff that would hurt the pumps
RMS velocity gradient
Floating upside down
Cheap - low biosolids - resistant to shock - simple

27. What is special about chloramine
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
Settling of floculant particles
Always the same dose needed - but that dose is higher

28. What is thickening - name 2 ways
Add salt
High Molecular Weight Synthetics
Easy/Costly hard to dewater
De watering - belt press and centrifuge

29. Compression Settling
Last chance to remove particles
Acts like a sponge - water moves around particles
Always the same dose needed - but that dose is higher
Residual at tap

30. Discrete Sedimentation

31. Adsorption and Charge Nuetralization
Last chance to remove particles
Optimal dose depends on charge and concentration
High pH and cold is bad
Residual at tap

32. where is the break point in chlorination and what happens after
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Very pH dependent - grab pieces
Big Partices Catch little ones
The second dip in the graph - free chlorine is formed

33. filtration is the...
Add salt
Sedimentation - suspended solids
Last chance to remove particles
Very pH dependent - grab pieces

34. 4 mechanisms
Settling of floculant particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Last chance to remove particles
Very pH dependent - grab pieces

35. Flocuation settling
OCL
The second dip in the graph - free chlorine is formed
Low BOD - High suspended solids - no control - does not match limits`
Settling of floculant particles

36. Goal for wastewater disinfection
Very pH dependent - grab pieces
No residual
Want pH high for corrosion but lower for HOCL
Low BOD - High suspended solids - no control - does not match limits`