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Wastewater Grade 3 > Multiple Choice > Flashcards

Multiple Choice Flashcards

1
Q

Anaerobic digester methane gas normally contains at least how much methane ?

A

65%

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2
Q

If an anaerobic digester has a high volatile acid/alkalinity value one cause might be ?

A

Overloading the tank with organic material.

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3
Q

A roughing filter is

A

A filter that has a minimum solids loading of 300 lbs/ BOD/day/1,000 cu ft of media

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4
Q

Trickling filter part include

A

Distribution system

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5
Q

One way to dechlorinate a plant effluent is with

A

Sodium bisulfate

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6
Q

Liquid sulfur dioxide hazards include

A

Body tissue freezing

Asphyxiation

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7
Q

Sulfonation system parts include

A

Evaporator

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8
Q

An operator when applying a tank interior protective coating should

A

Apply protective creams to expose skin areas

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9
Q

When an operator thinks of A&W root beer, he might be thinking of.

A

Add acid to water

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10
Q

The first sign that an anaerobic digester is becoming stuck is normally

A

A change in the volatile acid/alkalinity relationship.

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11
Q

A sudden anaerobic digester has pressure drop might be caused by?

A

Relief valve opening

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12
Q

Rising sludge in a secondary clarifier is normally not caused by?

A

A high sludge age

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13
Q

___________ and ________ are nutrients and will pomote algaegrowth in the receiving stream.

A

Nitrogen and phosphorous compunds

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14
Q

In order for a pondto be functioning correctly ____________must be taking place

A

photosynthesis

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15
Q

One accurate method to measure a liquid level is

A

with a bubbler tubes

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16
Q

a pH meter

A

can be used to inidicate if a liquid is an acid or base

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17
Q

Can be usedas fertilizer if properly processed

A

Biosolids

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18
Q

One wastewater plant area whee explosive gasses never occur is

A

explosive gasses can occur in any plant area

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19
Q

what alarm is normally installed at the headworks

A

high water level alarm

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20
Q

sludge blanket depths

A

normally 2-4 feet deep

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21
Q

Anaerobic sludge digester reduces Violatile matter by …

A

50%

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22
Q

Sludge blanket depths can indicate…

A

if the sludge pump speed needs to be increased

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23
Q

an easily measure variable for aeration basin control is

A

DO

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24
Q

It is always improtant when using chlorine dosing …

A

to apply the correct amount an uder dose or an overdose can lead to serious problem

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25
Q

Chlorine could be used at aponds to

A

kill algae growths

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26
Q

reclaimed water must be of quality to …

A

protect public health

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27
Q

A chlorine leak is best detected by

A

using an ammonia soaked rag or ammonia mist

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28
Q

Sulfur dioxide container withdrawal rate is effected by

A

temperature

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29
Q

Sludge bulking is caused by

A

the sludge specific gravity being less than 1

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30
Q

Activated sludge tank microorganism type is influenced by …

A

pH temperature, and sludge age

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31
Q

Primary clarifier sludge pumping should be done

A

several times a day

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32
Q

Chlorine is not used for

A

promotion of microorganism growth

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33
Q

Trickling filter control can best be maintained by

A

assigning an experienced Operator to the job

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34
Q

Trickling filter failure is not caused by

A

maintaining aerobic conditions

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35
Q

Ponding is a problem associated with

A

trickling filter plants

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36
Q

odors can occur in what type of plant?

A

any type of plant

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37
Q

Sulfonator injector low vacuum reading will not be caused by

A

high back pressure

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38
Q

Hydrogen sulfide control can be accomplished by chlorine

A

at the headworks and in the biological process

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39
Q

Its important when using treated efflfuent for ground water recharge to insure

A

effluent quality always protects the public

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40
Q

Receiving waters tests include

A

temperature, coliform bacteria and DO

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41
Q

Indicators a plant effluent might be having adverse effets on the receiving water are

A

odors, deadfish, floating substances

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42
Q

A dangerous gas not normally ound at treatment plants is

A

one composed of 78% nitrogen and 22% oxygen

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43
Q

When starting a clarifier it is not necessary to chek

A

air diffusers for proper spacing

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44
Q

A properly unctioning primary claridfier will remove

A

readily settleable and floatable materials from wastewater

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45
Q

If a meter appears not to be operating properly, the Operator should not

A

open the cover and determine what is wrong on an electrical meter

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46
Q

The percent of solid material in wastewater is normally less than

A

0.10%

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47
Q

An anaerobic digester will normally produce gas at a rate of

A

13 to 18 cubic feet/pound of volatile solids destroyed

48
Q

A turbidity meter measures

A

wastewater clarity

49
Q

Chlorine is not used at a wastewater plant for

A

sterilization

50
Q

A roughing filter can be used to

A

reduce high bOD wasteater before trickling filter application

51
Q

Wastewater velocity needs to be ___________ to prevent solids from settling out

A

a minimum of 2 ft per second

52
Q

Gravity flow pipe capacity _______as the slope increases

A

increases

53
Q

A cubic feet of water is

A

7.48 gallons and weights 62.4 lbs

54
Q

Suspended growth reactors

A

are biological process, can be used to remove BOD or nitrogen from wastewater and care normally aerobic process.

55
Q

Wastewater treatment plant effluent may be used for

A

ground water recharge, cooling tower water and irrigation.

56
Q

Effluent not meeting groundwater recharge quality standards should

A

retreated until quality standards can be met

57
Q

Plant effluent may be used for

A

deep-well injection, sooling tower water and irrigation

58
Q

Injection wells may develop the following problem

A

well screen clogging, slime growth, lime incrustation

59
Q

Safety hazards at wastewater plant include

A

drowning, electrical shock, pathogenic organisms

60
Q

Irrigation with plant effluent

A

is a beneficial reuse of wastewater effluent

61
Q

The use of wastewater effluent for growing crops is

A

irrigation

62
Q

Hyacinth cultures are associated with

A

ponds and removal of nutrients from wasewater

63
Q

Hyacinth cultures are associated with

A

ponds and removal of nutrients from wasewater

64
Q

Backwashing a filter is done to…

A

remove solids plugging the filter

65
Q

Turbidity is often caused by

A

colloidal solids

66
Q

The activated sludge process

A

is biological , aerobic and considered secondary treatment

67
Q

Before starting an activated sludge basin, check the

A

aeration equipment, gates and wiers, RAS and WAS pumps

68
Q

Suspended solids tests should be taken at

A

The headworks, the final clarifier effluent and aeration basin.

69
Q

A Wastewater Operator works for

A

the EPA

70
Q

An aerated grit chamber will

A

refreshen the plant influent and protect downstream equipment

71
Q

If preliminary processes are overloaded or bypassed…

A

floating debris can appear in the chlorine contact basin
floating debris can appear in the final effluent
sticks and rags can oul the sludge pumps

72
Q

The aeration basin MLSS is referred to as “activated” because..

A

the MLSS is teeming with bacteria, funji and protozoa

73
Q

Problems that can occur when starting an aeration basin include

A

gates might not work
flow lines might be plugged
air lines might be plugged

74
Q

Trickling filter ponding can be prevented or resolved by

A

dosing the filter with chlorine

putting into operation a grit chamber

75
Q

Filter flies can be controlled by

A

keeping distributor arm orifice openings clear

76
Q

Types o sedimentation and flotation units

A

clarifiers

grit chambers

77
Q

What factor does not influence clarifier solids settleability

A

laboratory analyses

78
Q

An anaerobic process is one containing no…

A

dissolved oxygen

79
Q

The main purpose of a wastewater treatment plant is to

A

protect downstream water users

80
Q

Advantage of the COD over the BOD test is

A

it only takes a few hours to complete

81
Q

The settleability test

A

is used for activated sludge process control

indicates how well a clarifier is performing

82
Q

when removing a primary clarifier from service

A

the clarifier detention time will decrease

83
Q

in the F/M ratio the F is

A

organic matter only

84
Q

MCRT can be used to calculate what?

A

wasting rate
return sludge rate
MLSS concentration

85
Q

High rate and low rate normally refer to

A

the flow rate

86
Q

Microorganisms contained in the MLSS may include

A

amoeboids
flagellates
ciliates

87
Q

The luxury uptake process has to do with

A

phosphorous removal

88
Q

A normal clarifier loading rate is

A

800-1,200 gpd/sq ft

89
Q

The MLSS concentration in an activate sludge basin ranges from

A

2,500 - 4,500 mg/L

90
Q

Nitrification is best carried out in the ____activated sludge process

A

conventional or plug flow

91
Q

The pure oxygen automatic analysis and purge system is a

A

safety device

92
Q

The RAS flow rate is normally adjusted to

A

hold the MLSS aeration basin concentration constant

93
Q

Sludge blanket depth is best measured by

A

a sludge judge

94
Q

The WAS rate effects the

A

effluent quality

95
Q

The MLSS measure the concentration of

A

activated sludge basin solids

96
Q

It is a good idea when designing or modifying a wastewater plant to have the Operator review the plans in order to

A

make suggestion that might make operation easier

97
Q

Safety precautions for pressure vessel interior inspection include

A

following confined space procedures

98
Q

the major advantage of water hyacinth systems is

A

its natural process requiring little energy input

99
Q

When receiving a computer generated maintenance order the Operator should

A

check that the work needs to be done

100
Q

When using chlorine from a one ton cylinder which valve does chlorine gas flow from?

A

Top valve

101
Q

What is the main purpose of primary sedimentation?

A

to remove easily floatable and settleable solids

102
Q

a barimutor will

A

reduce the size of influent solids

103
Q

When starting or placing a new piece of equipment into service it is a good idea to

A

perform a general equipment check

104
Q

Primary clarifier abnormal conditions are caused by

A

high influent rates and solid concentrations

105
Q

Poor clarifier performance is normally associated with

A

a heavy layer of scum on the clarifier surface and rising sludge

106
Q

One advantage of trickling filter is that

A

foaming is not normally a problem

107
Q

one rule for safety when working around chlorine gas is

A

make sure a self contained breathing apparatus is located outside the chlorine room for emergency action

108
Q

When making a change to the activated sludge process how long should you give the process to stabilize

A

1 week

109
Q

A primary clarifier should remove what percent of the influent settleable solids

A

60 - 95%

110
Q

The main environmental factor effecting biological waste treatment is

A

Temperature

111
Q

If digester gas production starts decreasing

A

the digester could be going sour

112
Q

What would you do if the volatile acid/alkalinity relationship started to increase in a digester

A

Check historical data for trends

113
Q

When nitrifying ammonia, it is important to maintain adequate DO in the mixed liquor to

A

prevent denitrification and sludge building in the secondary clarifier

114
Q

Gravity thickeners are most similar to

A

clarifiers

115
Q

The SVI can be used to control

A

the RAS and WAS rate in an activated sludge process

116
Q

When measuring replacement pump shaft diameter

A

use a micrometer

117
Q

One purpose of the pure oxygen activated sludge vent valve is to

A

allow carbon dioxide and nitrogen to be vented from the

Wastewater Grade 3 (3 decks)

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