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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. Differential Sedimentatioin
High pH and cold is bad
Remove the dead pigs - stuff that would hurt the pumps
Last chance to remove particles
Big Partices Catch little ones

2. Goal for wastewater disinfection
Easy/Costly hard to dewater
Forms clear interface between particles and supernatant( big word) - particles move around the water
Always the same dose needed - but that dose is higher
No residual

3. where is the break point in chlorination and what happens after
Cheap - low biosolids - resistant to shock - simple
The second dip in the graph - free chlorine is formed
Want pH high for corrosion but lower for HOCL
Settling of floculant particles

4. Disinfection
Remove viruses and bacteria that slipped through filter
Not in my back yard - nutrient overload - crops
Turn a large number of small particles into a small number of large particles
Very pH dependent - grab pieces

5. Secondary Clairfier removes _____
Fixed films
High Molecular Weight Synthetics
Residual at tap
Acts like a sponge - water moves around particles

6. Higher pH gives more
OCL
Particle in a medium - they don't interact with other particles
Remove as many organic and non organic particles as possible
RMS velocity gradient

7. Purpose of sedimentation in drinking water
Remove all flocculated particles
High pH and cold is bad
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Remove as many organic and non organic particles as possible

8. Adsorption and Charge Nuetralization
Easy/Costly hard to dewater
Optimal dose depends on charge and concentration
Want pH high for corrosion but lower for HOCL
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

9. Disadvantages of trickling
De watering - belt press and centrifuge
Sedimentation - suspended solids
RMS velocity gradient
Low BOD - High suspended solids - no control - does not match limits`

10. What is thickening - name 2 ways
Optimal dose depends on charge and concentration
OCL
Remove as many organic and non organic particles as possible
De watering - belt press and centrifuge

11. Dichotomy of energy level for floculation

12. Compression Settling
Acts like a sponge - water moves around particles
Add salt
Cheap - low biosolids - resistant to shock - simple
Floating upside down

13. Sedimentation
Chemically - Aerobically - Anaerobically
Residual at tap
Floating upside down
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

14. Purpose of Floculation
De watering - belt press and centrifuge
Acts like a sponge - water moves around particles
Turn a large number of small particles into a small number of large particles
Floating upside down

15. Flocuation settling
Acts like a sponge - water moves around particles
Chemically - Aerobically - Anaerobically
Remove viruses and bacteria that slipped through filter
Settling of floculant particles

16. Stabilization 3 ways
Chemically - Aerobically - Anaerobically
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

17. filtration is the...
Particle in a medium - they don't interact with other particles
Big Partices Catch little ones
Last chance to remove particles
Remove as many organic and non organic particles as possible

18. 4 mechanisms
Particle in a medium - they don't interact with other particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Settling of floculant particles
Last chance to remove particles

19. CL catch 22
Optimal dose depends on charge and concentration
Not in my back yard - nutrient overload - crops
Want pH high for corrosion but lower for HOCL
Add salt

20. Discrete Sedimentation

21. Enmeshment in Sweep Floc
Last chance to remove particles
Optimal dose depends on charge and concentration
Very pH dependent - grab pieces
Need enough to make it happen - don't shear the floc though

22. Land applicatioin worries
Not in my back yard - nutrient overload - crops
The second dip in the graph - free chlorine is formed
Remove the dead pigs - stuff that would hurt the pumps
Turn a large number of small particles into a small number of large particles

23. Purpose of sedimentation in waste water
Particle in a medium - they don't interact with other particles
Remove as many organic and non organic particles as possible
No residual
High pH and cold is bad

24. Primary clarifier uses _____ removes _____
Fixed films
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Particle in a medium - they don't interact with other particles
Sedimentation - suspended solids

25. Advantage of trickling filter
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`
Fixed films
Cheap - low biosolids - resistant to shock - simple

26. Headloss change over time
De watering - belt press and centrifuge
Turn a large number of small particles into a small number of large particles
Floating upside down
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam

27. What is special about chloramine
Remove all flocculated particles
The second dip in the graph - free chlorine is formed
Always the same dose needed - but that dose is higher
Residual at tap

28. G
Add salt
Floating upside down
Remove as many organic and non organic particles as possible
RMS velocity gradient

29. What is the effect of temperature and pH
High pH and cold is bad
Floating upside down
Optimal dose depends on charge and concentration
The second dip in the graph - free chlorine is formed

30. Point of pre treatment
Need enough to make it happen - don't shear the floc though
Sedimentation - suspended solids
Remove the dead pigs - stuff that would hurt the pumps
Residual at tap

31. Bridging
Easy/Costly hard to dewater
High Molecular Weight Synthetics
Add salt
Remove the dead pigs - stuff that would hurt the pumps

32. Hinderded Settling
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
RMS velocity gradient
Not in my back yard - nutrient overload - crops

33. Advantage/Disadvantage of Aerobic digestion
Acts like a sponge - water moves around particles
Want pH high for corrosion but lower for HOCL
The second dip in the graph - free chlorine is formed
Easy/Costly hard to dewater

34. Goal for drinking water disinfection
Fixed films
Residual at tap
Sedimentation - suspended solids
High Molecular Weight Synthetics

35. Compress double layer
Last chance to remove particles
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Add salt
Discrete - floculation - hindered - compression

36. 4 types of sedimentation
Remove as many organic and non organic particles as possible
Turn a large number of small particles into a small number of large particles
Discrete - floculation - hindered - compression
Sedimentation - suspended solids