Test your basic knowledge |

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 Floculation
Turn a large number of small particles into a small number of large particles
High Molecular Weight Synthetics
Forms clear interface between particles and supernatant( big word) - particles move around the water
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging

2. What is special about chloramine
Always the same dose needed - but that dose is higher
The second dip in the graph - free chlorine is formed
Low BOD - High suspended solids - no control - does not match limits`
Need enough to make it happen - don't shear the floc though

3. What is thickening - name 2 ways
High pH and cold is bad
De watering - belt press and centrifuge
Chemically - Aerobically - Anaerobically
Add salt

4. Higher pH gives more
Remove all flocculated particles
Chemically - Aerobically - Anaerobically
OCL
Remove viruses and bacteria that slipped through filter

5. Enmeshment in Sweep Floc
Low BOD - High suspended solids - no control - does not match limits`
Very pH dependent - grab pieces
Acts like a sponge - water moves around particles
Remove all flocculated particles

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

7. Purpose of sedimentation in waste water
Turn a large number of small particles into a small number of large particles
High pH and cold is bad
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Remove as many organic and non organic particles as possible

8. Land applicatioin worries
Want pH high for corrosion but lower for HOCL
Not in my back yard - nutrient overload - crops
Turn a large number of small particles into a small number of large particles
Remove the dead pigs - stuff that would hurt the pumps

9. Dichotomy of energy level for floculation

10. Point of pre treatment
Remove the dead pigs - stuff that would hurt the pumps
Floating upside down
De watering - belt press and centrifuge
Add salt

11. CL catch 22
Residual at tap
Always the same dose needed - but that dose is higher
Settling of floculant particles
Want pH high for corrosion but lower for HOCL

12. Advantage of trickling filter
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Add salt
Cheap - low biosolids - resistant to shock - simple
Chemically - Aerobically - Anaerobically

13. Differential Sedimentatioin
Optimal dose depends on charge and concentration
Discrete - floculation - hindered - compression
Turn a large number of small particles into a small number of large particles
Big Partices Catch little ones

14. Purpose of sedimentation in drinking water
Remove all flocculated particles
Need enough to make it happen - don't shear the floc though
Easy/Costly hard to dewater
Add salt

15. Flocuation settling
Want pH high for corrosion but lower for HOCL
High pH and cold is bad
Settling of floculant particles
Sedimentation - suspended solids

16. Goal for wastewater disinfection
No residual
Particle in a medium - they don't interact with other particles
Always the same dose needed - but that dose is higher
Settling of floculant particles

17. where is the break point in chlorination and what happens after
The second dip in the graph - free chlorine is formed
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Always the same dose needed - but that dose is higher
Big Partices Catch little ones

18. Stabilization 3 ways
Very pH dependent - grab pieces
Chemically - Aerobically - Anaerobically
Discrete - floculation - hindered - compression
Cheap - low biosolids - resistant to shock - simple

19. Disinfection
Remove viruses and bacteria that slipped through filter
Fixed films
Always the same dose needed - but that dose is higher
Last chance to remove particles

20. Goal for drinking water disinfection
Cheap - low biosolids - resistant to shock - simple
Remove the dead pigs - stuff that would hurt the pumps
Add salt
Residual at tap

21. Adsorption and Charge Nuetralization
Optimal dose depends on charge and concentration
No residual
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

22. Compress double layer
Remove the dead pigs - stuff that would hurt the pumps
Residual at tap
Particle in a medium - they don't interact with other particles
Add salt

23. Compression Settling
Forms clear interface between particles and supernatant( big word) - particles move around the water
Acts like a sponge - water moves around particles
Residual at tap
Need enough to make it happen - don't shear the floc though

24. G
Sedimentation - suspended solids
RMS velocity gradient
Very pH dependent - grab pieces
High Molecular Weight Synthetics

25. Sedimentation
Very pH dependent - grab pieces
Settling of floculant particles
Floating upside down
De watering - belt press and centrifuge

26. Bridging
Low BOD - High suspended solids - no control - does not match limits`
High Molecular Weight Synthetics
De watering - belt press and centrifuge
Cheap - low biosolids - resistant to shock - simple

27. filtration is the...
Add salt
Last chance to remove particles
High pH and cold is bad
Residual at tap

28. Hinderded Settling
Discrete - floculation - hindered - compression
Turn a large number of small particles into a small number of large particles
Last chance to remove particles
Forms clear interface between particles and supernatant( big word) - particles move around the water

29. Primary clarifier uses _____ removes _____
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Want pH high for corrosion but lower for HOCL
Sedimentation - suspended solids
Very pH dependent - grab pieces

30. Discrete Sedimentation

31. 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
Discrete - floculation - hindered - compression
Fixed films

32. 4 types of sedimentation
Last chance to remove particles
Cheap - low biosolids - resistant to shock - simple
Compress double layer - adsoprtion and nuetralization - enmeshment - particle bridging
Discrete - floculation - hindered - compression

33. What is the effect of temperature and pH
Floating upside down
High pH and cold is bad
Acts like a sponge - water moves around particles
Add salt

34. Advantage/Disadvantage of Aerobic digestion
No residual
Remove all flocculated particles
Easy/Costly hard to dewater
Residual at tap

35. Secondary Clairfier removes _____
Residual at tap
Very pH dependent - grab pieces
Fixed films
Add salt

36. Headloss change over time
Fixed films
De watering - belt press and centrifuge
Discrete - floculation - hindered - compression
Starts high then goes down like a parabolla as the particles settle then goes back up as it starts to jam