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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. Purpose of sedimentation in drinking water
Easy/Costly hard to dewater
Particle in a medium - they don't interact with other particles
OCL
Remove all flocculated particles

2. Higher pH gives more
Optimal dose depends on charge and concentration
Add salt
Remove viruses and bacteria that slipped through filter
OCL

3. Discrete Sedimentation

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4. Sedimentation
Add salt
No residual
Remove as many organic and non organic particles as possible
Floating upside down

5. Goal for drinking water disinfection
Acts like a sponge - water moves around particles
The second dip in the graph - free chlorine is formed
Residual at tap
Need enough to make it happen - don't shear the floc though

6. What is the effect of temperature and pH
High pH and cold is bad
Add salt
Remove the dead pigs - stuff that would hurt the pumps
Easy/Costly hard to dewater

7. 4 mechanisms
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Always the same dose needed - but that dose is higher
Particle in a medium - they don't interact with other particles
Chemically - Aerobically - Anaerobically

8. Advantage of trickling filter
High pH and cold is bad
Sedimentation - suspended solids
Chemically - Aerobically - Anaerobically
Cheap - low biosolids - resistant to shock - simple

9. Advantage/Disadvantage of Aerobic digestion
Easy/Costly hard to dewater
No residual
Remove all flocculated particles
Add salt

10. What is thickening - name 2 ways
Low BOD - High suspended solids - no control - does not match limits`
De watering - belt press and centrifuge
Cheap - low biosolids - resistant to shock - simple
Not in my back yard - nutrient overload - crops

11. G
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
RMS velocity gradient
De watering - belt press and centrifuge

12. Compression Settling
De watering - belt press and centrifuge
Settling of floculant particles
Acts like a sponge - water moves around particles
Remove viruses and bacteria that slipped through filter

13. Stabilization 3 ways
Acts like a sponge - water moves around particles
Chemically - Aerobically - Anaerobically
Always the same dose needed - but that dose is higher
De watering - belt press and centrifuge

14. Bridging
Big Partices Catch little ones
High Molecular Weight Synthetics
OCL
Particle in a medium - they don't interact with other particles

15. Primary clarifier uses _____ removes _____
Very pH dependent - grab pieces
High Molecular Weight Synthetics
RMS velocity gradient
Sedimentation - suspended solids

16. Disadvantages of trickling
Remove all flocculated particles
Big Partices Catch little ones
Low BOD - High suspended solids - no control - does not match limits`
Need enough to make it happen - don't shear the floc though

17. Hinderded Settling
Turn a large number of small particles into a small number of large particles
Discrete - floculation - hindered - compression
High Molecular Weight Synthetics
Forms clear interface between particles and supernatant( big word) - particles move around the water

18. Headloss change over time
Last chance to remove particles
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
OCL

19. Purpose of Floculation
Remove viruses and bacteria that slipped through filter
Turn a large number of small particles into a small number of large particles
Need enough to make it happen - don't shear the floc though
The second dip in the graph - free chlorine is formed

20. Goal for wastewater disinfection
No residual
Remove viruses and bacteria that slipped through filter
Fixed films
Add salt

21. What is special about chloramine
Always the same dose needed - but that dose is higher
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
High Molecular Weight Synthetics
Turn a large number of small particles into a small number of large particles

22. Flocuation settling
High pH and cold is bad
High Molecular Weight Synthetics
Remove as many organic and non organic particles as possible
Settling of floculant particles

23. Point of pre treatment
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
De watering - belt press and centrifuge
Optimal dose depends on charge and concentration
Remove the dead pigs - stuff that would hurt the pumps

24. 4 types of sedimentation
High Molecular Weight Synthetics
Discrete - floculation - hindered - compression
Optimal dose depends on charge and concentration
Easy/Costly hard to dewater

25. Differential Sedimentatioin
Forms clear interface between particles and supernatant( big word) - particles move around the water
Chemically - Aerobically - Anaerobically
Big Partices Catch little ones
Very pH dependent - grab pieces

26. CL catch 22
RMS velocity gradient
Want pH high for corrosion but lower for HOCL
Chemically - Aerobically - Anaerobically
Very pH dependent - grab pieces

27. Compress double layer
Low BOD - High suspended solids - no control - does not match limits`
Cheap - low biosolids - resistant to shock - simple
Floating upside down
Add salt

28. Dichotomy of energy level for floculation

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29. Secondary Clairfier removes _____
Fixed films
Discrete - floculation - hindered - compression
De watering - belt press and centrifuge
No residual

30. Disinfection
Need enough to make it happen - don't shear the floc though
Remove viruses and bacteria that slipped through filter
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam
Always the same dose needed - but that dose is higher

31. Enmeshment in Sweep Floc
Turn a large number of small particles into a small number of large particles
Sedimentation - suspended solids
Very pH dependent - grab pieces
Add salt

32. Purpose of sedimentation in waste water
Remove as many organic and non organic particles as possible
No residual
High pH and cold is bad
Last chance to remove particles

33. where is the break point in chlorination and what happens after
The second dip in the graph - free chlorine is formed
OCL
Remove as many organic and non organic particles as possible
No residual

34. Land applicatioin worries
Not in my back yard - nutrient overload - crops
Forms clear interface between particles and supernatant( big word) - particles move around the water
Discrete - floculation - hindered - compression
Big Partices Catch little ones

35. Adsorption and Charge Nuetralization
Settling of floculant particles
Optimal dose depends on charge and concentration
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
De watering - belt press and centrifuge

36. filtration is the...
High Molecular Weight Synthetics
Acts like a sponge - water moves around particles
Remove the dead pigs - stuff that would hurt the pumps
Last chance to remove particles