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Class 2 > Study Guide > Flashcards

Study Guide Flashcards

1
Q

3 types of alkalinity

A

Hydroxide, bicarbonate, carbonate

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2
Q

2 materials found in wastewater to make fertilizer

A

Nitrogen and phosphorus

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3
Q

Where do you place the leak on a leaking chlorine container?

A

On top, chlorine is heavier than air

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4
Q

Lab records must be kept on file for how long?

A

3 years

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5
Q

Solids files must be kept on file for how long?

A

5 years

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6
Q

Emergency contact lists should be verified?

A

Quarterly

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7
Q

2 pumps of same capacity operate together with a single main, the discharge will be?

A

The same as one pump

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8
Q

A common maintenance procedure for UV is?

A

Check and clean the quarts sleeves

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9
Q

Most likely cause of fluctuating discharge output in a progressive cavity pump

A

Leak in suction line

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10
Q

The beveled edge of a weir is located?

A

At the top face of the weir

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11
Q

For security, Scada should not be connected to?

A

The internet

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12
Q

What is the purpose of a fecal bath?

A

Regulate temperature

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13
Q

Carbon-nitrogen-phosphorus ratio?

A

100:5:1

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14
Q

What chemicals reduce or eliminate chlorine residual?

A

Sulfur dioxide and sodium metabisulfite

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15
Q

In electrical circuits what is used to reduce voltage when necessary

A

Transformer

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16
Q

This gas is found in digester start up

A

Carbon dioxide

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17
Q

Amperometric titration is used to measure?

A

Chlorine residual

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18
Q

Fecal coliform test is recorded as

A

Geometric mean

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19
Q

What happens if you can not obtain a chlorine residual?

A

Nitrates in the effluent

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20
Q

To achieve an overall threat rating for a specific event you should look at

A

The magnitude of the impact

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21
Q

Threshold limit value time weighted average is what?

A

Max allowable exposure for 8 hours with no harmful effects

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22
Q

Electrical pressure available to cause a flow of current when an electrical circuit is closed is what?

A

Voltage

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23
Q

Besides viscosity, what is an important consideration in the selection of a lubricating oil?

A

Thermal Range

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24
Q

Which of the following explains how to handle a chlorine release?

A

Emergency Response plan

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25
Q

Uniforms, if, and stated logos on wastewater system vehicles are critical components of?

A

Public awareness and security program

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26
Q

What’s the easiest way to determine whether the rotor or stator on a progressive cavity pump is worn?

A

Track the discharge flow rate over time

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27
Q

Improper rotation in a centrifugal pump may cause?

A

Reduced or no flow

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28
Q

Wear ring are installed in a pump to?

A

Wear instead of the impeller

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29
Q

What device is used to measure chlorine flow rates?

A

Rotameter

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30
Q

When working in a confined space where flammable gases may be present, use tools only made of what?

A

A non sparking alloy

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31
Q

In addition to the worker entering a confined space, what is the minimum number of people required to be present in a confined space entry?

A

1

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32
Q

During morning checks you notice that the bearings in a pump are running hot. Why is that happening?

A

The bearing are over lubricated

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33
Q

An increase in carbon dioxide content in wastewater will?

A

Lower the PH

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34
Q

Ammonia is added to chlorine to

A

Maintain the chlorine residual for longer periods of time. (Chloramines)

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35
Q

Unit for electrical resistance

A

Ohm

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36
Q

If PH drops in a anaerobic digester, what happens to alkalinity?

A

Lowers

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37
Q

Constant weight is obtained when?

A

The weight change is less that 4% of the previous weight

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38
Q

Materials purchased and received by the utility should be

A

Verified against the purchase order

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39
Q

Wastewater flows with large objects should be pumped by?

A

A pump with a closed impeller

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40
Q

The best back-flow prevention device is?

A

An air gap

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41
Q

To assure a pump is delivering design flows and pressures you should?

A

Measure flows and pressures and compare to manufacturer pump curve

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42
Q

What method if used to determine DO

A

Winkler Titration

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43
Q

What type of materials should be avoided to piping systems involving ferric chloride?

A

Metals

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44
Q

Type of pump used to decrease the overall specific weight of a confined column of gas to water mixture?

A

Air lift

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45
Q

What do you do to adjust your sample before ammonia distillation?

A

Raise the PH

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46
Q

COD sample holding time is

A

28 days

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47
Q

2 gases that are most prominent in digester start up

A

Carbon dioxide and nitrogen

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48
Q

As the temp increases, the oxygen transfer rate?

A

Increases

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49
Q

Orifice has to do with

A

Air gas flow meter

50
Q

Ammonia sample preservation

A

Cooling sample to <6*C
Lowering PH to <2 with H2SO4

51
Q

Holding time for PH, DO, and chlorine residual test

A

15mins

52
Q

Easiest way to determine if progressive cavity internal elements are worn is

A

Low Discharge pressure

53
Q

2 bacteria in digesters

A

Acid Formers
Methane/ Gas Formers

54
Q

Facultative ponds are made up of?

A

An aerobic top layer
An anaerobic bottom layer

55
Q

What gas has the lowest exposure limit?

A

H2S Hydrogen Sulfide

56
Q

Chlorine leaks may be detected by?

A

Ammonia solution

57
Q

Vector control is what?

A

To control the way a disease travels with organisms that carry diseases

58
Q

Probe used with a portable DO meter is?

A

Polarographic

59
Q

Holding time for nitrate

A

Cool <6*C
48 hours

60
Q

Holding time for preservation of BOD

A

Cool<6*C
Sulfuric Acid
48hrs

61
Q

Holding time for Alkalinity

A

14 days

62
Q

Hold time for Ammonia sample once preserved

A

28 days

63
Q

Holding time for FOG

A

28 days

64
Q

What is added to a COD sample to prevent chlorine interference

A

Mercury Sulfate

65
Q

Difference between COD and BOD

A

Cod is a fasted test and cod tends to have higher results than BOD

66
Q

How often should the temp change on a anaerobic digester

A

1* F per day

67
Q

If there is white billowing foam and an increase in hound sludge?

A

Decrease wasting

68
Q

Mechanical bar screen rake inoperative but motor runs you should?

A

Check/ replace the shear pin

69
Q

When using an evaporator in disinfection, the chlorine pressure reducing valve should be located where?

A

Down stream of the evaporator

70
Q

Foaming in aerobic digester, what do you do?

A

Slow down the feed rate

71
Q

When pumping a corrosive liquid, what should the diff range of the seal water should be compared to the pumps discharge pressure.

A

5 to 9.9 (34.5 to 68.2 kPa)

72
Q

If an air compressor is cycling on and off frequently, what is the cause?

A

Leaky valve

73
Q

A pump station with variable frequency drives with 2 complete pumping units provided, what flow should each pumping unit be capable of delivering?

A

The max daily design flow of the station

74
Q

During normal operation of positive pressure, open-circuit self-contained breathing apparatus what should be closed?

A

The bypass valve

75
Q

Maintenance required for capacitance level indicators includes?

A

Checking and cleaning the connections

76
Q

A recently rebuilt centrifugal pump has been returned to service and is now drawing more amps than usual. What is the most likely problem?

A

Packing is too tight

77
Q

If a centrifugal pump vibrates and is noisy what could be the cause?

A

Air is in the pump

78
Q

The primary indicator of an upset anaerobic digester is?

A

Volatile acids increase and Alkalinity decreases

79
Q

Typically, the presence of light, stiff, white foam on the surface of an aeration tank is a indicator of what?

A

High F:M
Decrease Wasting

80
Q

When collecting nocardia samples where is it highly concentrated?

A

In the foam

81
Q

In an anaerobic digester, gas pressures are maintained by a controlling mechanism that commonly regulates?

A

6 to 8 inches of water column pressure

82
Q

When determining the suction head or lift of a centrifugal pump, measure the distance from the?

A

Water surface to the center line of the impeller

83
Q

The head against which a a pump must operate is

A

The sum of the static head and the friction head

84
Q

Suction lift on a centrifugal pump should not exceed

A

25ft

85
Q

Open channel flow devices are primarily

A

Parshall Flume

86
Q

What does a drain tap do on a digester

A

Drain condensation from gas piping

87
Q

Most significant problem in using activated sludge process to treat cannery waste

A

Nutrient imbalance

88
Q

A gravimetric belt feeder uses this to measure

A

Weight

89
Q

In conducting an oxygen uptake, the feed sample consists of

A

RAS

90
Q

How is the amount of oxygen transferred by aerators affected by the water temperature

A

Oxygen transfer rate increases as the temperature increases

91
Q

Aeration tank effluent PH is a 7.4. Effluent PH is a 6.5. MCRT is 14.5 days. What is the most likely cause

A

Insufficient alkalinity to support the nitrification process

92
Q

The addition of high strength anaerobic digester supernatant to the head of the aeration tank will

A

Decrease the DO

93
Q

Chain of custody procedures follow a sample for

A

Sample collection to sample disposal

94
Q

This type of pump can pump 6% solids

A

Positive displacement pump

95
Q

How is a valve named?

A

By the shape of its internal closing mechanism

96
Q

NPDES

A

National pollutant discharge elimination system

97
Q

When is sludge considers properly digested

A

When 50% of organic matter has been destroyed and converted to gas

98
Q

How long does proper digestion take

A

Take 30 days @35C or 95F

99
Q

How should digester supernatant be handled

A

Fed slowly back to the head of the plant to avoid shock loading or over loading of nutrients

100
Q

What ratio of methane and carbon dioxide is found in digesters?

A

70% methane
30% Carbon Dioxide

101
Q

Algae used the process of photosynthesis by

A

Using carbon dioxide to produce oxygen

102
Q

What may cause a reduction in the pump discharge rate?

A

Suction lift higher than anticipated

103
Q

Plant influent appears black and has a foul odor each morning. The cause is traced to a pump station at a subdivision which is oversized for the subdivision. What can you do?

A

Decrease the distance between the on and off pump time in the wet well. (Pumps will run more frequently)

104
Q

Most important factor in preventing accidents at a wastewater plant

A

Attitude of the employees

105
Q

If other factors remain constant, the capacity of a centrifugal pump increases when the?

A

Head of the pump increases

106
Q

Upon inspecting an idle centrifugal effluent pump? You notice the shaft is spinning backwards. What should you do?

A

Check the check valve

107
Q

If equipment fails but there is no danger to the public the repair is classified as what?

A

Corrective maintenance

108
Q

They type of maintenance used to extend equipment life, reduce maintenance costs, and increase reliability is referred to as?

A

Preventative

109
Q

Establishing a baseline for the performance of equipment over time is a necessary step in maintenance.

A

Predictive

110
Q

Filamentous bacteria are identified by

A

Long strands of bacteria growing like spaghetti or strands of hair

111
Q

What benefits could come from the addition of hydrogen peroxide into collection system?

A

Oxidation of odor compounds
Keeps system aerobic preventing odors
Kills odor producing bacteria

112
Q

What is the BOD contribution of a person per day?

A

.17lbs

113
Q

How long does a BOD test take?

A

5 days

114
Q

How long does a COD test take?

A

2 to 3 hours

115
Q

Ozone is only generated on-site because?

A

It is unstable

116
Q

Straggler floc

A

Young sludge

117
Q

Stalked ciliates are the predominant organisms found in your mixed liquor, this means?

A

Mixed liquor is healthy and the facility is running well

118
Q

Fecal coliform preservation and hold time

A

Cool to <10*C
.2ml of 3% solution of sodium thiosulfite
8 hour hold time

119
Q

1.2kw and 120 volts, calculate amps

A

10 amps

120
Q

If an industry is sending your plant 300mg/l of BOD. You also have a town sending you flow serving 2700 people. What percentage of the load is coming in the industry?

A

40%

Class 2 (2 decks)

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