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Class 4 Wastewater > Class 4 > Flashcards

Class 4 Flashcards

1
Q

Are used to carry sewage or stormwater under streams highways or other depressions(higher or lower)

A

Inverted siphon pump

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2
Q

Measures 2/3 upstream of converging section

A

Parshall flume

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3
Q

Flow is determined by amount of water going through that weir

A

Weir

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4
Q

Measures flow find measuring the difference in pressure before and at the construction of the pipeline

A

Venturi meter

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5
Q

Day to night change

A

Diurnal

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6
Q

How many turns do you leave a chlorination cylinder open after a restart

A

1/4

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7
Q

If a mechanical seal drips

A

Replace it immediately

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8
Q

How should packing be installed

A

Diagonally offset at a 45° angle

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9
Q

How many pounds of oxygen can algae produce on a summer day

A

1.6 lbs

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10
Q

What determines the effectiveness of dechlorination

A

Fecal coliform

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11
Q

Advantages of aerobic compared to anaerobic

A

Aerobic happens quicker but cost more

Anaerobic cost less but it’s lower and much more complex

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12
Q

What type of gas is produced in anerobic dig

A

Methane

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13
Q

What drives the Distributor arm on a trickling filter

A

Hydraulic flow

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14
Q

Vortex

A

Pump that pumps medium to heavy solids

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15
Q

Oxygen deficient in a confined space

A

19.5%

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16
Q

Water enters through the _____ of the impeller and leaves the ________

A

Eye

Vane

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17
Q

Mechanical seal is either made of _____or ______

A

Carnon or ceramic

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18
Q

Minimum operating depth of lagoon

A

2ft

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19
Q

How many foot a fresh water and a lagoon before adding flow

A

2

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20
Q

Run Lagoon and series during ______ and parallel during_______

A

Summer winter

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21
Q

Lagoon draw downs happen in ______and ________

A

Spring and fall

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22
Q

Minimum requirement of DO in the effluent

A

6.0

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23
Q

Fm ratio

A

.2-.6

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24
Q

_____mg/l will have no effect but _____mg/l will

A

5 50

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25
Q

Secondary clarifier removes _____% of BOD

A

70-85

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26
Q

Activated sludge your moves _____% of BOD AND SUSPENDED SOLIDS and takes ___-___ hrs

A

90 99

4-8 hours

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27
Q

A significant change for an activated sludge plant is _____ F up or down

A

10

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28
Q

NPDES permit needs to be renewed every _____days

A

5 years and must be submitted 180 days before expiration

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29
Q

Operating temp of mechanical seal and a pump should never exceed

A

161 F or 71C

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30
Q

In a digester above the scum blanket as where gases are collected which is ___% methane and ____%CD

A

30 70

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31
Q

Maximum loading on a sand filter is

A

15gal/sqft/day

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32
Q

Normal domestic sewage contains

A

50% organic

50% inorganic

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33
Q

Odor detection limit of chlorination gas

A

.0ppm

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34
Q

Head of weir is measured from the

A

Crest of the weir to the bottom of the weir plate

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35
Q

Short circuiting is

A

Flow taking a direct path from entry to exit with no proper detention time

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36
Q

MCL is

A

Maximum contamination level

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37
Q

Composite samples are used to test for

A

BOD TSS AMONIA

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38
Q

A DO test is performed

A

Immediately after sampling

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39
Q

What pumps can be started against a head

A

Centrifugal

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40
Q

What blower can be started against a close valve

A

Centrifugal

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41
Q

Fluctuating flows can be reduced by using

A

Variable speed pump’s or short pump cycles

42
Q

Chlorine is a

A

Disinfectant

43
Q

Always add acid to

A

Water

44
Q

Grit is mainly

A

In organic materials

45
Q

Algae respiration affect on pH in lagoon

A

Highest during day

Lowest at night

46
Q

Bacteria does the most work in a

A

Faculitive lagoon

47
Q

Dark sparkling means

A

Good and high in PH and DO

48
Q

Dechlorination feed right of sulfur as

A

1:1

49
Q

Roto meters control

A

Feed rates of chlorine

50
Q

Copper sulfate controls

A

Algae growth

51
Q

Oxidizers are used to

A

Control odors in a collection system

52
Q

How can grit be removed from a pump

A

Vortex pump

53
Q

How many contacts needed for a 440 circuit

A

3

54
Q

What is aSCADA system

A

Computer system that monitors waste water

55
Q

BOD needs to be incubated for how many days at what temperature

A

Five days at 20°C

56
Q

Temperature for oven on total solids test

A

104 C

57
Q

What gas has the lowest specific gravity

A

H2S

58
Q

Which gas has the highest specific gravity

A

CO

59
Q

What affects the disinfection process in UV light

A

Unfiltered water, chemicals

60
Q

RBCs are ____ under water

A

1/4 1/2

61
Q

Current is measured in

A

Amps

62
Q

Sterilization is

A

Killing all organisms

63
Q

Disinfection is

A

killing all pathogenic organisms

64
Q

Trickling filters are

A

Biological aeration treatment

65
Q

Clarifiers do what

A

Separate or settle solids

66
Q

What provides lubrication on packing seals

A

Clean water

67
Q

A fusable plug will melt at

A

160F

68
Q

If you show A positive fecal coliform test

A

Take a repeat sample and retest after 24 hours

69
Q

BOD samples can be stored for

A

24 hours at 20°C

70
Q

DO calibration method

A

Azide

71
Q

Piston pumps are also called

A

Reciprocating pumps

72
Q

If a unit goes down on a parallel circuit

A

It will seize function until the Parallel circuit is replaced

73
Q

Weeds are to be

A

Called sprayed or cultivated by tilling the top layer

74
Q

If water stops flowing in a chlorinator

A

The vacuum is broken and no chlorine will be fed

75
Q

Long Sluggish sewers can cause

A

Hydrogen Sulfide and corrosion problems

76
Q

Pooling/ponding is caused by

A

Excessive biological growth on trickling filter

77
Q

Vector in bio solids

A

Misquotes, birds, fleas rodents

78
Q

Past NPDES permits need to be kept for how long

A

3 years

79
Q

Facultative pond has what type of organic loading

A

15-30 lb/bod/acre/day

80
Q

Copper sulfate can control what

A

Algae growth

81
Q

What will cause the lowest amperage reading

A

Broken coupler

82
Q

Oxygen solubility is greatest in

A

Winter

83
Q

The two major items in activated sludge is

A

Aerated basin and secondary clarifier

84
Q

A transformer does what

A

Steps up or down voltage for use

85
Q

Rubber coupling is used for what on a blower

A

To displace and allow heat expansion

86
Q

Sloughing is what

A

When biological growth builds up and growth on bottom drops off to be removed

87
Q

Mesophillic

A

80-100F

88
Q

Thermophillic

A

120-135F

89
Q

Lay dry beds

A

8-12 inches

90
Q

Highest loading in a lagoon

A

Nearest to the influent

91
Q

Two types of anerobic bacteria

A

Acid bacteria

Methane bacteria

92
Q

Positive displacement pumps are used to pump

A

Sludge

93
Q

Raw wastewater contains

A

BOD TSS FOG NH3

94
Q

Sources of wastewater

A

Domestic-houses
Storm flow- drains
Industry- factory
I and I- above and below ground

95
Q

What is the book where we find testing standards

A

Method of standards

96
Q

SARAH is what

A

Superfund amendments and reaurhroization act

It covers hazardous materials used and stored on site

97
Q

NPDES stands for

A

National pollutants discharge elimination system

98
Q

What should you do with disposing of grit and screenings

A

Landfill and buried immediately

99
Q

Endogenous repspirstion occurs in what plant

A

extended airation

100
Q

Your Supervisor recommends that you increase the deal levels in the entering of the Orval oxidation ditch

A

Change weir depth or change BFE setting

101
Q

Start up a lagoon should be what time of year

A

Spring summer

Class 4 Wastewater (1 decks)

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