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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. Secondary Clairfier removes _____
Chemically - Aerobically - Anaerobically
Fixed films
Forms clear interface between particles and supernatant( big word) - particles move around the water
Always the same dose needed - but that dose is higher

2. Point of pre treatment
OCL
RMS velocity gradient
Remove the dead pigs - stuff that would hurt the pumps
Need enough to make it happen - don't shear the floc though

3. Headloss change over time
Big Partices Catch little ones
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
No residual
Floating upside down

4. Purpose of Floculation
Turn a large number of small particles into a small number of large particles
Sedimentation - suspended solids
De watering - belt press and centrifuge
Particle in a medium - they don't interact with other particles

5. Stabilization 3 ways
Easy/Costly hard to dewater
Remove viruses and bacteria that slipped through filter
Chemically - Aerobically - Anaerobically
Particle in a medium - they don't interact with other particles

6. 4 types of sedimentation
Settling of floculant particles
Low BOD - High suspended solids - no control - does not match limits`
OCL
Discrete - floculation - hindered - compression

7. What is special about chloramine
OCL
Always the same dose needed - but that dose is higher
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Settling of floculant particles

8. Land applicatioin worries
Remove as many organic and non organic particles as possible
Chemically - Aerobically - Anaerobically
Not in my back yard - nutrient overload - crops
Very pH dependent - grab pieces

9. Adsorption and Charge Nuetralization
Optimal dose depends on charge and concentration
OCL
Very pH dependent - grab pieces
RMS velocity gradient

10. G
The second dip in the graph - free chlorine is formed
RMS velocity gradient
Optimal dose depends on charge and concentration
Residual at tap

11. where is the break point in chlorination and what happens after
High Molecular Weight Synthetics
Not in my back yard - nutrient overload - crops
Remove viruses and bacteria that slipped through filter
The second dip in the graph - free chlorine is formed

12. Advantage/Disadvantage of Aerobic digestion
Sedimentation - suspended solids
Easy/Costly hard to dewater
Floating upside down
Particle in a medium - they don't interact with other particles

13. What is the effect of temperature and pH
De watering - belt press and centrifuge
High pH and cold is bad
The second dip in the graph - free chlorine is formed
Settling of floculant particles

14. CL catch 22
Remove the dead pigs - stuff that would hurt the pumps
Want pH high for corrosion but lower for HOCL
Need enough to make it happen - don't shear the floc though
De watering - belt press and centrifuge

15. Compression Settling
Sedimentation - suspended solids
Acts like a sponge - water moves around particles
OCL
Remove as many organic and non organic particles as possible

16. Enmeshment in Sweep Floc
Easy/Costly hard to dewater
The second dip in the graph - free chlorine is formed
Very pH dependent - grab pieces
Want pH high for corrosion but lower for HOCL

17. Differential Sedimentatioin
Big Partices Catch little ones
Floating upside down
Particle in a medium - they don't interact with other particles
Not in my back yard - nutrient overload - crops

18. Flocuation settling
Remove as many organic and non organic particles as possible
Settling of floculant particles
Remove the dead pigs - stuff that would hurt the pumps
Last chance to remove particles

19. Purpose of sedimentation in drinking water
Remove the dead pigs - stuff that would hurt the pumps
Residual at tap
Chemically - Aerobically - Anaerobically
Remove all flocculated particles

20. Disadvantages of trickling
Always the same dose needed - but that dose is higher
Low BOD - High suspended solids - no control - does not match limits`
Remove as many organic and non organic particles as possible
RMS velocity gradient

21. What is thickening - name 2 ways
Optimal dose depends on charge and concentration
Add salt
De watering - belt press and centrifuge
Acts like a sponge - water moves around particles

22. Discrete Sedimentation

23. Sedimentation
Floating upside down
Remove viruses and bacteria that slipped through filter
Discrete - floculation - hindered - compression
Last chance to remove particles

24. Disinfection
Always the same dose needed - but that dose is higher
Remove the dead pigs - stuff that would hurt the pumps
De watering - belt press and centrifuge
Remove viruses and bacteria that slipped through filter

25. filtration is the...
Turn a large number of small particles into a small number of large particles
Floating upside down
Last chance to remove particles
Remove as many organic and non organic particles as possible

26. Goal for drinking water disinfection
Residual at tap
OCL
Settling of floculant particles
Always the same dose needed - but that dose is higher

27. Advantage of trickling filter
Residual at tap
High Molecular Weight Synthetics
Not in my back yard - nutrient overload - crops
Cheap - low biosolids - resistant to shock - simple

28. Purpose of sedimentation in waste water
Chemically - Aerobically - Anaerobically
Remove as many organic and non organic particles as possible
Low BOD - High suspended solids - no control - does not match limits`
No residual

29. Bridging
High Molecular Weight Synthetics
Cheap - low biosolids - resistant to shock - simple
De watering - belt press and centrifuge
Fixed films

30. Goal for wastewater disinfection
De watering - belt press and centrifuge
No residual
Cheap - low biosolids - resistant to shock - simple
Settling of floculant particles

31. Hinderded Settling
Forms clear interface between particles and supernatant( big word) - particles move around the water
Discrete - floculation - hindered - compression
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High Molecular Weight Synthetics

32. Compress double layer
Cheap - low biosolids - resistant to shock - simple
Add salt
Big Partices Catch little ones
Chemically - Aerobically - Anaerobically

33. Primary clarifier uses _____ removes _____
Sedimentation - suspended solids
Settling of floculant particles
Remove the dead pigs - stuff that would hurt the pumps
De watering - belt press and centrifuge

34. Higher pH gives more
High pH and cold is bad
Need enough to make it happen - don't shear the floc though
Very pH dependent - grab pieces
OCL

35. Dichotomy of energy level for floculation

36. 4 mechanisms
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Chemically - Aerobically - Anaerobically
Discrete - floculation - hindered - compression