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NEHA RS Test > Potable Water > Flashcards

Potable Water Flashcards

1
Q

Soil Conditions most favorable for removal of viruses

A

Fine loamy sand over course sand and gravel

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2
Q

Most resistant to unfavorable environmental conditions indicating past pollution

A

Close Sporulates

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3
Q

Most dependable Well

A

Drilled well

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4
Q

Not considered satisfactory to solution of chem contamination of well

A

boiling water

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5
Q

Most widely used to destroy microorganisms

A

chlorine

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6
Q

Backflow

A

air gap

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7
Q

micro photosynthesis, roots stems, leaves-taste odor

A

algae

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8
Q

Drinking water standards specify water is safe if

A

1 test positive out of 40 samples

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9
Q

High JTU

A

High Turbidity

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10
Q

Water contaminated by feces

A

Coliform

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11
Q

NTU

A

Turbidity

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12
Q

Safety of a water system

A

Sanitary survey

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13
Q

Ground water systems

A

dug, bored, driven, drilled, rock/sand/earth spring, infiltration galleries

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14
Q

Water hardness

A

Dissolved calcium, mg bicarb, sulfates, chlorides,

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15
Q

desalination

A

seawater/brackish to fresh water

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16
Q

Quality of surface water depends on

A

elimination of coliform organisms

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17
Q

not used for disinfection of water

A

silver nitrate

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18
Q

hydro pneumatic or pressure tank water systems are suitable for

A

small communities, housing developments, homes, estates, camps, food service, hotels

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19
Q

Hydro pneumatic contains

A

80% of its column of water

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20
Q

Water containing nitrates

A

evidence of previous pollution

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21
Q

Diatomaceous earth filters

A

should be augmented by chlorination

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22
Q

Hydrogen sulfide fatal at

A

300 PPM

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23
Q

Removing nitrates from water

A

ion exchange

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24
Q

Not practical for removing cadmium

A

reverse osmosis

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25
Q

Backsiphonage not prevented by

A

baramateric loop

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26
Q

Microbial pollution travels short distance through

A

sandy loam or clay

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27
Q

abundant supply of groundwater can be yielded from

A

sedimentary rocks

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28
Q

surface water supply example

A

reservoir

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29
Q

properly seal a well

A

grouting

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30
Q

not contribute to water hardness

A

sodium chloride

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31
Q

settling of water would occur in reservoir lake or basin with out chemicals

A

plain sedimentation

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32
Q

not common device for backsiphoniage

A

cross connections

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33
Q

Can be used full strength for disinfection

A

sodium hypochlorite

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34
Q

recommended filter for small communities/rural places

A

slow sand filter

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35
Q

will vary with the water quantity used for domestic purposes except

A

amount of mineral

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36
Q

groundwater through plants root system

A

transpiration

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37
Q

sanitary survey is for

A

safety of water supply

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38
Q

sources of water supply

A

ground water/ surface water

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39
Q

rotten egg smell

A

hydrogen sulfide

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40
Q

high concentration of nitrates

A

possible cause of methemoglobinemia

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41
Q

Turbidity of water will

A

interfere with disinfection, harbor viruses, cause tase and odor

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42
Q

Its presence will indicate fresh pollution

A

ammonia

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43
Q

plant effluent is used as a measure of filtration efficiency

A

aluminium

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44
Q

most common reason of contaminations of well drilled

A

failure of seal of well casings

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45
Q

Proper water disinfection chlorine includes

A

temp, ph, contact period

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46
Q

Used to control growth of algae and protozoa

A

filtration

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47
Q

gases commonly found in water encourage corrosion

A

oxygen and carbon dioxide

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48
Q

in emergencies small quantities of water can be disinfected by boiling or

A

iodine

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49
Q

not sued to disinfect water

A

florine

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50
Q

presence would indicate past or intermittent pollution

A

Clost perf

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51
Q

measure of scattered light particles

A

NTU

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52
Q

determines free available chlorine

A

DPD-Color

53
Q

GAC filters used to

A

treat bottles water, remove taste, remove organic chems

54
Q

Ozone is effective against

A

amoebic cysts, bacteria phenols, virusis

55
Q

90% of sodium arsenate can be removed by

A

coagulation

56
Q

reduction of fluorides in drinking water

A

coagulation, lime softening, ion exchange,

57
Q

trihalmoethanes created in

A

during pre chlorination process

58
Q

Langelier index used to determine

A

calcium carbonate

59
Q

Hydraulic rams are powered by

A

water

60
Q

well casing installed with

A

concrete as grout

61
Q

back flow of non potable water may occur by

A

backpressure, backsiphonage

62
Q

flushometer valve protected by

A

non pressure type vacuum breaker

63
Q

resettling reservoirs for turbidity or pollutions retention time

A

2-3 days

64
Q

activated carbon powdered form, tastes and odors are removed by

A

adsorption

65
Q

water borne diseases worldwide

A

excess of 250 million illnesses/yr

66
Q

residential cesspool and septic absorption system discharge

A

400 millions gallons into ground each year

67
Q

leaching from garbage dump found to pollute wells

A

2,000 ft away

68
Q

Drinking water hardness desirable at

A

50-80mg/1

69
Q

Alkalinity desirable at

A

0-5mg

70
Q

water system serving 1 apartment with 3 apartments total and sic residents

A

not a public water system

71
Q

major regulatory requirements for safe drinking water act

A

public info

72
Q

not included in nine containment groups

A

microorganisms

73
Q

not classified as a sedimentary formation

A

olivine

74
Q

serpentine, slate, soapstone, marble

A

metamorphic

75
Q

soil that has greater porosity

A

silt

76
Q

chem used to dechlorinate water

A

sodium thiosulfate

77
Q

fecal contamination

A

coliform

78
Q

soil that is most favorable for removal of viruses

A

fine loamy sand over course sand and gravel

79
Q

MBAS test for

A

detergents containing phosphates

80
Q

2 elements that cause most hardness

A

CA, MG

81
Q

least desirable test for chlorine

A

OTA

82
Q

not sued as a coagulant

A

sodium hydrochlorite

83
Q

not know as a iron bacteria

A

girardia lambia

84
Q

worst pipe damage from corrosion

A

soft water, low alkalinity, presence of oxygen

85
Q

facultative bacteria

A

live in both anaerobic and aerobic conditions

86
Q

primary organism in chloroform test

A

E coli

87
Q

not a measure of turbidity

A

siple tubidity unit

88
Q

another name for epsom salt

A

magnesium sulfate

89
Q

biochem oxidation of ammonia yields

A

nitrate

90
Q

associated with methemoglobinemia

A

nitrate

91
Q

drinking water additives is responsibility of

A

EPA

92
Q

lake characteristics being clean, high in DO, deep

A

oligotrophic

93
Q

organisms most resistant to unfavorable environments

A

clost Sporulates

94
Q

Algae will not cause

A

fall in PH

95
Q

presence of bacteria responsible for typhoid fever

A

fecal contamination

96
Q

tastes and odors due to presence of

A

algae, protozoa

97
Q

Hydrogen sulfide fatal at

A

300ppm

98
Q

microbial pollution only travel short distance through

A

sandy loam and clay

99
Q

Hep A caused by

A

Virus

100
Q

1 X 10-8 Moles liters

A

8

101
Q

Used as a coagulant in water treatment

A

aluminium sulfate

102
Q

disinfecting ability is most affected by

A

hydrogen ion concentration

103
Q

improperly located wells may lead to

A

salmonellosis, shigella, chlorea, hepatitis

104
Q

Hep B is associated with

A

blood particles

105
Q

water treatment came from need to control

A

typhoid

106
Q

typhoid, chlora, shigella, commonly transmitted by

A

fecal oral vehicle borne

107
Q

does not provide residual

A

ozone

108
Q

aeration is advantageous in treatment containing

A

dissolved iron, manganese

109
Q

masonry reservoirs and rural water supplies are called

A

cisterns

110
Q

liquid form of chlorine in emergency is called

A

sodium hydrochlorite

111
Q

ground water that is likely to travel the furthest is

A

limestone

112
Q

presence of coliform indicates

A

presence of pathogens

113
Q

evidence of colorifom in MPN test

A

presence of gas from fermentation

114
Q

presence of e coli

A

human fecal contamination

115
Q

activated carbon used for

A

control taste and odors

116
Q

physical cross connection

A

may prevent potable from an unportable source

117
Q

backsiphonage is likely result of

A

potable with non potable used for fire fighting

118
Q

positive water test is proof that the water contains

A

coliform and unsafe to drink

119
Q

DPD test

A

Chlorine and bromine

120
Q

if hardwater is softened with ion exchange what will increase

A

sodium

121
Q

obtaining water sample

A

open for 2-3 minutes, hold bottle near base, fill to within 1 inch of top

122
Q

number of sample submitted is determined by

A

population size

123
Q

type of filter recommended for small communities

A

slow sand filter

124
Q

aeration is a natural process which

A

increases contact with air and water, improves physical and chem characteristics of water

125
Q

main function of sand filter

A

remove suspended solids

126
Q

chlorine contact of 30ppm is

A

excessive

127
Q

gases that encourage corrosion are

A

oxygen and carbon dioxide

128
Q

ozone is effective against

A

cysts, bacterial phenols and viruses

NEHA RS Test (8 decks)

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