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C Waste Water Management > Wastewater C Exam 2019 Study Guide > Flashcards

Wastewater C Exam 2019 Study Guide Flashcards

1
Q

1) You suspect your anaerobic digester is going sour, what is the best way to verify its condition?

A

VA/ALK Ratio

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2
Q

2) What is considered normal operation of an aerobic digester?

A

Settle and Decant as needed

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3
Q

3) What growth phase is an aerobic digester operated in?

A

Endogenous Respiration

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4
Q

4) Low DO and nutrient deficiency will promote the growth of what?

A

Filamentous Bacteria

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5
Q

5) If you pump green sludge to a drying bed, what chemical should be applied?

A

Lime

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6
Q

6) Chlorine leaks can be detected by?

A

Ammonia solution with Q-tip

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7
Q

7) Why is an aerobic digester covered?

A

To protect from cold weather

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8
Q

8) What takes place in the stabilization tank in a contact stabilization plant?

A

Absorption

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9
Q

9) Why would you chlorinate the RAS line?

A

To control filamentous bacteria

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10
Q

10) What is the most common type of pond?

A

Facultative

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11
Q

11) Denitrification will cause what?

A

Rising sludge

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12
Q

12) How does the temperature effect disinfection?

A

Higher the temperature the greater the disinfection

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13
Q

13) How long should you wait after you make a process change before making another change?

A

1 Week

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14
Q

14) What is needed to calculate the F/M ratio?

A

BOD in Ibs and MLVSS in Ibs

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15
Q

15) What type of ponds are used after a trickling filter?

A

Polishing pond

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16
Q

16) You have excessive billowing, white, sudsy foam on the surface of the aerator. What is the cause?

A

F/M is too high

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17
Q

17) Chlorine is not coming out. Another cylinder is hooked up with the same problem occurring. What is the problem?

A

Manifold line is clogged

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18
Q

18) What would cause the most damage to a centrifugal pump?

A

Cavitation

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19
Q

19) Coliform bacteria are used for what?

A

Indicators of possible presence of pathogenic organisms

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20
Q

20) It can be said that:

A

The lower the PH, the greater the disinfection

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21
Q

21) What is the disadvantage of a hypo chlorinator?

A

Increases the PH and decreases the disinfection

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22
Q

22) What 2 stages are in an anaerobic digester?

A

Acid formation and gas formation

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23
Q

23) What is the benefit of step-feed aeration?

A

Treat higher flows in less space

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24
Q

24) What are the 2 main gases produced by an anaerobic digester?

A

Methane and CO2

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25
Q

25) When working in a manhole, what would be the biggest danger?

A

Asphyxiation

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26
Q

26) What are some similarities between Methane and H2S?

A

Flammable, explosive, colorless

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27
Q

27) What causes the most wear to an impeller?

A

Grit

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28
Q

28) What is a true statement about recording data?

A

There are many ways to record data

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29
Q

29) Short circuiting in a primary clarifier can be prevented by?

A

Baffles

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30
Q

30) What do you do if you experience a plant upset due to hydraulic overload?

A

Decrease WAS to maintain microorganism population

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31
Q

31) You have dark foam, High MLSS, slow settling sludge with a clear effluent, you should?

A

Maintain 1-3 foot sludge blanket, monitor MLSS, increase DO if necessary

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32
Q

32) The PH in your plant is decreasing, effluent turbidity is increasing, and sludge is rising in the clarifier.
What is the problem?

A

Denitrification

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33
Q

33) How do you calculate the F/M ratio?

A

Influent COD Ibs, divided by the MLVSS in Ibs

34
Q

34) A good settling sludge would consist of what type of Protozoa?

A

Free swimmers and stalked ciliates

35
Q

35) Low DO and nutrient deficiency will promote the growth of what?

A

Filamentous bacteria

36
Q

36) Coliform count fails to meet the standards and your chlorine supply is not the problem. What is?

A

Short circuiting and low contact time

37
Q

37) The Settleometer settles fairly slowly. You have shiny, dark foam on the surface of the aerator. What
is the problem?

A

MCRT too high

38
Q

38) CI2 combined with ammonia forms what?

A

Chloramines

39
Q

39) What is the best range of parameters for the Activated Sludge process?

A

2mg/L DO, PH 7.0, 80-90 Temp

40
Q

40) What can happen if more than 40lbs of chlorine is withdrawn from a 150lb tank in a 24 hour period?

A

Freezing of the lines

41
Q

41) The TSS of the digester supernatant should be calculated because?

A

To measure the solids load on the plant

42
Q

42) The first step in anaerobic digestion is?

A

Acid formation

43
Q

43) The correct way to break up an overloaded blanket in an anaerobic digester is?

A

Spray down the blanket

44
Q

44) Chapter code 699/ What is staffing based on?

A

Flow and type of treatment

45
Q

45) What is one of the most dangerous gases in the plant?

A

Hydrogen sulfide

46
Q

46) What causes white foam?

A

Low MLSS

47
Q

47) What causes sludge bulking?

A

Filaments

48
Q

48) What can cause rancid or nasty butter smelling supernatant in an anaerobic digester?

A

Toxic shock load

49
Q

49) Which of the following are not protozoa?

A

Nematodes

50
Q

50) If you see dead spots in the aeration tank what is the cause?

A

Lack of air/blocked diffuser pipe

51
Q

51) If you have Filament bulking what do you check?

A

SVI

52
Q

52) What do use on an electrical fire?

A

Carbon Dioxide

53
Q

53) What is a trend?

A

Increase or decrease in the same direction

54
Q

54) What is an Aliquot?

A

Representation of a sample

55
Q

55) Pump impeller provide what end of suction piping with a screen?

A

Intake end

56
Q

56) Digesters should be cleaned every?

A

5 Years or 3-8 Years

57
Q

57) When mixing Acid and water you should always?

A

Add acid to water, never the reverse

58
Q

58) Chlorine cylinders should be stored?

A

In the upright position

59
Q

59) What is the velocity in a grit channel?

A

1 foot per second

60
Q

60) What prevents explosions if excessive pressure builds up in a chlorine tank?

A

Fusible plug

61
Q

61) The distance between manholes is?

A

300-500 Feet

62
Q

62) Normal operation of a centrifugal pump?

A

One drip per second

63
Q

63) What will cause an operator to permanently loose licensure?

A

Gross negligence

64
Q

64) Chapter 62-620 FAC : Plant records must be kept onsite for how many years?

A

3 years

65
Q

65) What causes dark sudsy foam on the aeration tank surface?

A

Low DO levels

66
Q

66) What is highly corrosive in the presence of moisture, respiratory irritant, irritation to the eyes, skin
and mucus membrane?

A

Sulfur dioxide

67
Q

67) What type of positive displacement pump should never be operated against a closed discharge
valve, pipe could be damaged by excessive pressure?

A

Piston pump

68
Q

68) What is the first step in anaerobic digestion?

A

Acid formation

69
Q

69) When is the best time to return supernatant from an aerobic digester to the plant?

A

During high flows

70
Q

70) What is a mixture of two or more liquids (one suspended in the other) called?

A

Emulsion

71
Q

71) Which organisms will thrive if the DO in the aeration tank is too low?

A

Filamentous organisms

72
Q

72) Bubbles are attaching to floc and floating it to the surface, what is the cause?

A

Denitrification

73
Q

73) What is the proper ratio of nutrients in domestic wastewater (BOD:Nitrogen:Phosphorus:Iron)?

A

100:5:1:0.5

74
Q

74) Where should samples be taken in a conventional activated sludge plant?

A

At the effluent end of the aerator

75
Q

75) What is “riprap” used for?

A

To protect against erosion

76
Q

76) What can be caused by over aeration?

A

Floc shearing

77
Q

77) Which of the following would be the best VA/ALK ratio?

A

0.1:1.0

78
Q

78) What is it called when nitrate is reduced to nitrogen gas?

A

Denitrification

79
Q

79) Which organisms will predominate when the F/M ratio is low?

A

Rotifers

80
Q

80) What should you do in low temperatures if complete nitrification is required?

A

Increase MLSS

81
Q

81) In a properly operating facultative pond, algae live on carbon dioxide and nutrients during the day,
and at night produce carbon dioxide. This has what effect on PH?

A

PH increases during the day and

decreases at night

82
Q

82) How can a sour digester be recovered?

A

Add lime or seed sludge from another plant

C Waste Water Management (5 decks)

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