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C Waste Water Management > Wastewater Midterm Review > Flashcards

Wastewater Midterm Review Flashcards

1
Q
  1. What should be done to a sample that has settled solids on the bottom of the sample jar prior to testing in laboratory? V2.7E-P499-500 (16.33)
A

Thoroughly mix the sample

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2
Q
  1. What problem can be expected when high nitrogen content is present in plant effluent that is being discharged to a stream? V1-7E-P23 (2.5)
A

Abundance of algae growth

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3
Q
  1. Why should soda-acid fire extinguisher never be used on an electrical fire? V2-7E-P303 (14.41)
A

Harmful gases will be produced

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4
Q
  1. What do algae use to support metabolic functions? V1-7E-P294 (9.0)
A

Nitrogen & phosphorus

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5
Q
  1. When analyzing data, a proportional increase or decrease in the values is called: V2-7E-P128 (11.1061)
A

Trend

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6
Q
  1. Which manual is approved for use in determining proper lab procedures? V2-7E-P471 (16.00)
A

Standard methods

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7
Q
  1. If a pump will not start, what should an operator check first? V2-7E-P367 (15.18)
A

Tripped circuit breaker

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8
Q
  1. What can happen when a centrifugal pump is operated against a closed discharge valve for extended periods of time? V2-7E-P346 (15.115)
A

Cavitation will occur damaging the impeller

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9
Q
  1. Plant effluent samples reveal a high coliform count. The chlorinator is operating properly and there is good residual. What is the most probable cause? V1-7E-P372 (Tab 10.1 9)
A

Short circuiting in contact chamber

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10
Q
  1. Where MLSS samples should be taken in an aerator? V2-7E-P112 (11.1011 = Fig 11.40)
A

Near the effluent and 1 foot below surface

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11
Q
  1. Why are aerobic digesters are sometimes covered? V2-7E-P218 (12.61)
A

To conserve heat in colder temperatures

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12
Q
  1. What process is used to remove chlorine from plant effluent prior to
    discharge into receiving waters? V1-7E-P401 (10.90)
A

Dechlorination

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13
Q
  1. What is one reason for aerating wastewater? V1-7E-P65 (4.1)
A

Separate oil & grease

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14
Q
  1. A healthy anaerobic digester will produce: V2-7E-P187 (12.26)
A

CO2 & methane

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15
Q
  1. There is an increase of coliform bacteria in the plant effluent. What is
    one possible cause of this? V1-7E-P372 (Tab 10.1 9)
A

Solids build-up in chlorine contact chamber

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16
Q
  1. What is the best indicator of a possible problem in an anaerobic digester? V2-7E-P191 (12.3-B)
A

VA/ALK ratio

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17
Q
  1. When using two lift station pumps, what is the best way to operate
    them?
A

Alternated pumps every 24 hours

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18
Q
  1. A properly operating primary clarifier will remove what percentage of suspended solids? V1-7E-P43 (3.5)
A

60%

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19
Q
  1. Which dangerous gas may be found at a wastewater treatment plant?
    V2-7E-P268 (Tab 14.1)
A

H2S, CL2, CH4

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20
Q
  1. Why should water never be put on a chlorine leak? V1-7E-P388 (10.52)
A

It will cause pipes and fittings to corrode

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21
Q
  1. What is a good ratio of nutrient levels in domestic wastewater? (BOD:
    Ammonia Nitrogen: Orthophosphate)
A

100; 5; 1

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22
Q
  1. What do pieces of stringing rags hanging from a Comminutor
    indicate? V1-7E-P80 (4.33)
A

A worn out cutter

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23
Q
  1. What is the maximum amount of chlorine that can be removed from a
    150 pound chlorine container in a 24 hour period? V1-7E-P396 (10.64)
A

40 Ibs.

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24
Q
  1. At how many parts per million is chlorine immediately deadly?
    V1-7E-P376 (Tab 10.2)
A

1000 ppm

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25
Q
  1. A good settling sludge would consist of what type of protozoa?
    V2-7E-P123 (Fig 11.49)
A

Free swimmers and Stalk ciliates

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26
Q
  1. You suspect your anaerobic digester is going sour. What is the best way to verify its condition? V2-7E-P191 (12.3-B)
A

VA/ALK ratio

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27
Q
  1. What is considered normal operation of an aerobic digester?
    V2-7E-P218 (12.62)
A

Settle and Decant as Needed

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28
Q
  1. Low DO and nutrient deficiency will promote the growth of what?
    V2-7E-P72 (11.62-4)
A

Filamentous bacteria

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29
Q
  1. If you pump green sludge to a drying bed what chemical should be
    applied? V2-7E-P221 (17.70)
A

Lime

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30
Q
  1. What takes place in the stabilization tank in a contact stabilization plant? V2-7E-P112 (11.1011-3)
A

Absorption

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31
Q
  1. Staffing is based on what? Chapter 62.699
A

Flow and type of Treatment

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32
Q
  1. Why would you chlorinate the RAS line? V2-7E-P74 (11.66)
A

Control filamentous bacteria

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33
Q
  1. What is the most common type of pond? V1-7E-P299 (9.2)
A

Facultative

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34
Q
  1. The ash content in lab procedure is the same as?
A

Inorganic solids

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35
Q
  1. Denitrification will cause what? V2-7E-P73 (11.65)
A

Rising sludge

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36
Q
  1. Coliform count fail to meet standards, your chlorine supply is not the
    problem. What most likely is? V1-7E-P372 (Tab 10.1 9)
A

Short circuiting and low contact time

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37
Q
  1. How does temperature effect disinfection?.V1-7E-P352 (10.13)
A

Higher the temp the better the disinfection

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38
Q
  1. How long should you wait after you make a process change before
    making another change? V2-7E-P71 (
A

1 week

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39
Q
  1. What is needed to calculate the F/M ratio? V2-7E-P16 (FN 3)
A

CBOD and MLVSS

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40
Q
  1. What types of ponds are used after a trickling filter, activated sludge,
    or BC plant? V1-7E-P297 (9.2)
A

Polishing pond

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41
Q
  1. Chlorine is not coming out of the chlorinator, chlorine tank is half full.
    What is the most likely problem? V2-7E-P372 (Tab 10.1 9)
A

Manifold line is clogged

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42
Q
  1. If you have a sudden increase of BOD by 50% or a BOD >400. What
    is this termed? V1-7E-P43 (3.5 + FN 12)
A

Increased organic load

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43
Q
  1. Coliform bacteria are used for what? V2-7E-P551 (6.A)
A

Indicators of possible presence pathogenic organisms

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44
Q
  1. CL2 combined with ammonia forms what? V1-7E-P350 (10.111)
A

Chloramines

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45
Q
  1. It can be said that: V1-7E-P352 (10.13)
A

The lower the pH, the greater the disinfection

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46
Q
  1. What is a quick test to check sludge condition? V2-7E-P517 (16.450 + FN 12)
A

Settlometer

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47
Q
  1. What is the range of parameters to promote the best microorganism
    growth for the Activated Sludge process?
A

2 ppm D.O., pH 7.0,75-95° F

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48
Q
  1. What is the benefit of step feed aeration? V2-7E-P88 (11.83)
A

Treat higher flows in less space

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49
Q
  1. What can happen if more than 40 lbs. of Cl2 is removed from a 150 Ibs. tank in a 24 hr. period? V1-7E-P396 (10.64)
A

Freezing of the lines

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50
Q
  1. In an anaerobic digester, when the VA/ALK ratio starts to increase, what will be noticeable? V2-7E-P191 (12.3 B)
A

An increase in CO2 & decrease in pH

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51
Q
  1. According to FAC Ch. 62-600, Domestic Wastewater Facilities, your job as an operator during major process breakdown is to?
A

Maintain competent documentation and record keeping

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52
Q
  1. Short circuiting in a primary clarifier can be prevented by?
    V1-7E-P135 (5.61)
A

Baffles

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53
Q
  1. What do you do if you experience a plant upset due to a hydraulic overload?V2-7E-P70 (11.61 Condition 2)
A

Decrease WAS to maintain microorganism population

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54
Q
  1. You have dark foam, high MLSS, slow settling sludge with a clear
    effluent, you should?
A

Maintain 1-3 ft. sludge blanket, monitor MLSS, increase D.O. in necessary

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55
Q
  1. If the blades on the Comminutor become dull, this can cause?
    V1-7E-P41 (3.30 FN 7)
A

Pumps to become clogged with rags

56
Q
  1. After a fall replacement of the roof of the chlorinator storage building the Cl2 stopped feeding during a hot summer day, what is the likely cause?
A

The tank become hotter than the manifold

57
Q
  1. If an activated sludge plant becomes upset, what is the most important and least time consuming operation an operator should do to discover the cause? V2-7E-P22 (11.041)
A

Check the plant data for the previous 3 weeks

58
Q
  1. If there is suspected leak with sulfur dioxide. What should you NOT use to detect it and why? V1-7E-P403 (10.921)
A

Soapy water/ Sulfuric acid

59
Q
  1. What take place in preliminary treatment? V1-7E-P34 (3.2)
A

Removes debris, sand, grit, freshens wastewater

60
Q
  1. What is the pH range of domestic wastewater producing the best
    organic activity? V2-7E-P579 (8 A,B)
A

6-8

61
Q
  1. What is the proper gas mixture in an anaerobic digester under normal
    operation? V2-7E-P191 (12.3 C)
A

70% Methane / 30% Carbon Dioxide

62
Q
  1. What is the liquid to gas expansion ratio of Chlorine? Florida Level *C° Workbook Chapter 8 P73
A

460: 1

63
Q
  1. A predominance of Nematodes, Rotifers, and Pin Floc in the effluent
    indicates? V2-7E-P123 (Fig 11.49)
A

Old Sludge

64
Q
  1. What are the three groups of Protozoa commonly found in good activated sludge? V2-7E-P119 (11.1031-3)
A

Ciliates, Flagellates, & Amoeba

65
Q
  1. Which is an indication of Old sludge? V2-7E-P123 (Fig 11.49)
A

Low SVI & Low F/M ratio

66
Q
  1. How long does It take until the results of a COD test are avallable?
    V2-7E-P541 (16.51-3)
A

4 hours

67
Q
  1. What are Saprophytic organisms? V2-7E-P148 (12.00 + FN 3)
A

Organisms that thrive on dead or decaying organic matter

68
Q
  1. What does a predominance of free swimming ciliates in the mixed
    liquor indicate? V2-7E-P119 (11.1031-3)
A

A stable operation

69
Q
  1. Septic conditions in the collection system will cause the pH to.
    V1-7E-P1 0-?
A

Decrease

70
Q
  1. Under what conditions will Filamentous organisms thrive?

V2-7E-P119 (11.1031-3)

A

When D.O. is low

71
Q
  1. What is it called when the velocity is greater in some sections of a
    clarifier than in others? V1-7E-P135 (5.61 2)
A

Short circuiting

72
Q
  1. What is the most desirable pH in a pond? V1-7E-P301 (9.3)
A

7.5

73
Q
  1. What nutrients are used by green algae? V1-7E-P294 (9.0)
A

Nitrogen and Phosphorous

74
Q
  1. When operating a pond, what tests should be performed on a regular
    basis (1-2 times per week)? V1-7E-P309 (9.610 D)
A

D.O., pH, and Temperature

75
Q
  1. Excessive D.O. levels can cause?. V2,7E-P19 (11.02)
A

Pinpoint floc

76
Q
  1. Sludge pumped from a clarifier sump should be? V1-7E-P130 (5.3)
A

As thick as possible

77
Q
  1. What is indicated by a high SVI and slow settling? V2-7E-P60-1 (11.560-1)
A

Young sludge

78
Q
  1. What happens to the pH in a pond during the day when algae are
    consuming carbon dioxide, producing oxygen? V1-7E-P299 (9.3)
A

Increases

79
Q
  1. The removal of settleable organic solids is an example of? V1-7E-P43 (3.5)
A

Primary Treatment

80
Q
  1. Which of the following is a cause of white foam? V2-7E-P49 (11.41) & P53 (11.501)
A

Activated Sludge Solids level too low

81
Q
  1. Which of the following may be the cause of Filamentous type bulking?
A

Septic influent wastewater
Low D.O. levels in the aeration tank
Oils & Grease

82
Q
  1. Which is a description of good solids in an aeration tank? V1-7E-P266 (8.26)
A

Golden to dark brown and granular

83
Q
  1. White fluffy foam indicates? V2-7E-P75 (11.67 4)
A

Low MLSS in aerator

High F/M ratio

84
Q
  1. Which organisms will predominate when the F/M ratio is low?
    V2-7E-P123 (Fig 11.49)
A

Rotifers

85
Q
  1. Which of the following is the most common short filament? V2-7E-P117 (11.1031-2b)
A

Nocardia

86
Q
  1. What is the proper ratio of nutrients in domestic wastewater? (BOD:
    Nitrogen; Phosphorous; Iron)
A

100; 5/1/0.5

87
Q
  1. In which class are electrical fires? V2-7E-P303 (14.41)
A

C

88
Q
  1. What could be the cause of Nocardia and foaming? V2-7E-P127 (11.1052)
A

Industrial waste/toxic shock loading

89
Q
  1. Which organisms are indicators of the possible presence of
    pathogens in water? V2-7E-P551 (6 A)
A

Coliform

90
Q
  1. Which modification of the activated sludge process requires the use of
    two separate aeration tanks? V2-7E-P86-7 (11.81-2)
A

Contact Stabilization

Krause

91
Q
  1. Which requires an Anoxic Zone for Denitrification? V2-7E-P90 (11.86)
A

Bardenpho

92
Q
  1. Which would be the best process to use when treating wastes from
    canneries and dairies? V2-7E-P87 (11.82)
A

Krause

93
Q
  1. Which process would better handle a shock load? V2-7E-P88 (11.83)
A

Step-Feed

94
Q
  1. Which process requires that all parts of the aeration tank be similar in
    terms of amount of food, organisms, and D.O.? V2-7E-P90 (11.84)
A

Complete Mix

95
Q
  1. Which process would best handle fluctuating flows? V2-7E-P93 (11.90)
A

Sequencing Batch Reactor

96
Q
  1. Where micro samples should be taken in a conventional activated sludge plant? V2-7E-P112 (11.1011)
A

At the effluent end of the aerator

97
Q
  1. What adjustment would need to be made if the F/M ratio is high?
    V2-7E-P19 (11.02)
A

Increase D.O.

98
Q
  1. Which of the following could be a cause of bulking? V2-7E-P71 (11.62)
A

High F/M Ratio

99
Q
  1. What color is the foam that is produced when Nocardia are present?
    V2-7E-P73 (11.66)
A

Brown

100
Q
  1. When using Step-Feed aeration, why would you introduce peak flows
    from storms or strong industrial wastes into the last half of the tank
    rather than the first half? V2-7E-P88 (11.83)
A

To avoid washout of activated sludge solids and culture microorganisms

101
Q
  1. What is formed when chlorine combines with water?

V1-7E-P349 (10.10)

A

Hypochlorous Acid + Hydrochloric acid

102
Q
  1. What would a high SVI indicate? V2-7E-P60-4 (11.56-7)
A

High Organic Loading
Predominance of flagellates
High F/M ratio

103
Q
  1. Which of the following microorganisms are most likely to be found during a difficult plant start up or a toxic overload? V2-7E-P119 (11.1031-3)
A

Amoeba

104
Q
  1. What adjustment can be made to the primary clarifier to correct a rising sludge problem? V2-7E-P73 (11.65)
A

Remove a primary clarifier from service

105
Q
  1. How long records must be kept on site? Chapter 62.620
A

Three Years

106
Q
  1. The Initial Chlorine Demand during disinfection is caused by?
    V1-7E-P350 (10.110)
A

Inorganic Material in the water

107
Q
  1. Which has the best disinfecting power when Hypochlorous acid and
    Ammonia are combined? V1-7E-P350 (10.111)
A

Dichloramine

108
Q
  1. What is the maximum holding time for BOD .samples? V2-7E-P502 (Tab 16.4)
A

48 hours

109
Q
  1. As the VA/ALK ratio increases, the .

- also increases? V2-7E-P191 (12.3 B)

A

Carbon Dioxide production

110
Q
  1. How can a Sulfur Dioxide leak be detected? V1-7E-P403 (10.921)
A

A rag soaked in strong ammonia

111
Q
  1. Why should a sludge line never be closed on both sides?

V2-7E-P221 (12.70)

A

Pressure from gases could cause a line rupture

112
Q
  1. What is one cause of light colored foam in an aerator? V1-7E-P266 (8.252)
A

Low suspended solids

113
Q
  1. When changing the temperature of a digester, you should never change it by more than_____degrees F per day?
    V2-7E-P191 (12.3 A)
A

1

114
Q
  1. What is the maximum holding time for pH samples? V2-7E-P502 (Tab 16.4)
A

No holding time

115
Q
  1. What is a Class B fire? V2-7E-P303 (14.41)
A

Oil

116
Q
  1. Which of the following organisms are predominate in old sludge? V2-7E-P120 (11.1031-4)
A

Rotifers

117
Q
  1. Why should a positive displacement pump never be operated against a closed discharge valve? V2 7E-P371 (15.191)
A

Pressure will cause the pipe, pump or valve to rupture

118
Q
  1. What is the typical pH range of domestic wastewater entering a
    treatment plant? V1 7E-P350 (10.111)
A

6.5-7.5

119
Q
  1. The removal of heavy inorganic solids is an example of? V1-7E-P41 (3.3)
A

Primary Treatment

120
Q
  1. Nocardia and foaming indicates? V2-7E-P117 (11.1031-2)
A

Low D.O. & Low F/M ratio

121
Q
  1. What is one cause of light-colored floating sludge solids on the secondary clarifier? V1-7E-P265 (8.252)
A

High aeration rates, decrease rate

122
Q
  1. At what temperature does a fusible plug in a chlorine cylinder melt?
    V1-7E-P378 (10.500)
A

158°F to 165°F

123
Q
  1. According to D.E.P rules, when is discharge monitoring reports to be
    filed by? Chapter 62.600
A

28th of the following month

124
Q
  1. How often should a primary clarifier be shut down for cleaning?
A

Every 12 months

125
Q
  1. Why is wastewater disinfected? V1-7E-P347(10.1)
A

To destroy pathogenic bacteria to safe levels

126
Q
  1. When pumping sludge to a digester it is best to pump? V2-7E-P185 (12.22)
A

Small amounts at frequent intervals

127
Q
  1. What type of sewer collects domestic waters from homes? V1-7E-P33 (3.10)
A

Sanitary

128
Q
  1. What conditions could occur when a sludge pump draws sludge too quickly? V2-7E-P185 (12.22)
A

Coning

129
Q
  1. What methods can be use to dispose of screenings? V1-7E-P71 (4.24)
A

Incineration and burial

130
Q
  1. A settlometer reveals that after 5 to 10 minutes solids won’t concentrate above 700 to 900, and settling is slow. What does this indicate?
A

Young sludge

131
Q
  1. How often should manholes be placed in the collection system for
    access and maintenance? V1-7E-P34 (3.10)
A

300-500ft

132
Q
  1. When effluent enters the secondary clarifier with a SVI of 300 what is
    likely to occur?
A

The sludge will settle evenly

133
Q
  1. Wasting rate changes should not exceed what % from one day to the
    next? V2-7E-P55 (11.53)
A

10% - 15%

134
Q
  1. If your floating digester cover is leaning to one side due to a compact
    scum blanket, what should you do to correct this problem? V2-7E-P211 (12.44-32)
A

Spray scum blanket with water to soften it

135
Q
  1. What type of pond is used for waste that has not received any prior treatment? V1-7E-P297 (9.2)
A

Stabilization pond

136
Q
  1. Why would we treat the RAS line with chlorine? V2-7E-P72 (11.62-4)
A

To control filamentous bacteria

137
Q
  1. What is a representative portion of a sample called? V2-7E-P813 (definitions)
A

An aliquot

C Waste Water Management (5 decks)

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