Potable Water Flashcards
1
Q
Soil Conditions most favorable for removal of viruses
A
Fine loamy sand over course sand and gravel
2
Q
Most resistant to unfavorable environmental conditions indicating past pollution
A
Close Sporulates
3
Q
Most dependable Well
A
Drilled well
4
Q
Not considered satisfactory to solution of chem contamination of well
A
boiling water
5
Q
Most widely used to destroy microorganisms
A
chlorine
6
Q
Backflow
A
air gap
7
Q
micro photosynthesis, roots stems, leaves-taste odor
A
algae
8
Q
Drinking water standards specify water is safe if
A
1 test positive out of 40 samples
9
Q
High JTU
A
High Turbidity
10
Q
Water contaminated by feces
A
Coliform
11
Q
NTU
A
Turbidity
12
Q
Safety of a water system
A
Sanitary survey
13
Q
Ground water systems
A
dug, bored, driven, drilled, rock/sand/earth spring, infiltration galleries
14
Q
Water hardness
A
Dissolved calcium, mg bicarb, sulfates, chlorides,
15
Q
desalination
A
seawater/brackish to fresh water
16
Q
Quality of surface water depends on
A
elimination of coliform organisms
17
Q
not used for disinfection of water
A
silver nitrate
18
Q
hydro pneumatic or pressure tank water systems are suitable for
A
small communities, housing developments, homes, estates, camps, food service, hotels
19
Q
Hydro pneumatic contains
A
80% of its column of water
20
Q
Water containing nitrates
A
evidence of previous pollution
21
Q
Diatomaceous earth filters
A
should be augmented by chlorination
22
Q
Hydrogen sulfide fatal at
A
300 PPM
23
Q
Removing nitrates from water
A
ion exchange
24
Q
Not practical for removing cadmium
A
reverse osmosis
25
Backsiphonage not prevented by
baramateric loop
26
Microbial pollution travels short distance through
sandy loam or clay
27
abundant supply of groundwater can be yielded from
sedimentary rocks
28
surface water supply example
reservoir
29
properly seal a well
grouting
30
not contribute to water hardness
sodium chloride
31
settling of water would occur in reservoir lake or basin with out chemicals
plain sedimentation
32
not common device for backsiphoniage
cross connections
33
Can be used full strength for disinfection
sodium hypochlorite
34
recommended filter for small communities/rural places
slow sand filter
35
will vary with the water quantity used for domestic purposes except
amount of mineral
36
groundwater through plants root system
transpiration
37
sanitary survey is for
safety of water supply
38
sources of water supply
ground water/ surface water
39
rotten egg smell
hydrogen sulfide
40
high concentration of nitrates
possible cause of methemoglobinemia
41
Turbidity of water will
interfere with disinfection, harbor viruses, cause tase and odor
42
Its presence will indicate fresh pollution
ammonia
43
plant effluent is used as a measure of filtration efficiency
aluminium
44
most common reason of contaminations of well drilled
failure of seal of well casings
45
Proper water disinfection chlorine includes
temp, ph, contact period
46
Used to control growth of algae and protozoa
filtration
47
gases commonly found in water encourage corrosion
oxygen and carbon dioxide
48
in emergencies small quantities of water can be disinfected by boiling or
iodine
49
not sued to disinfect water
florine
50
presence would indicate past or intermittent pollution
Clost perf
51
measure of scattered light particles
NTU
52
determines free available chlorine
DPD-Color
53
GAC filters used to
treat bottles water, remove taste, remove organic chems
54
Ozone is effective against
amoebic cysts, bacteria phenols, virusis
55
90% of sodium arsenate can be removed by
coagulation
56
reduction of fluorides in drinking water
coagulation, lime softening, ion exchange,
57
trihalmoethanes created in
during pre chlorination process
58
Langelier index used to determine
calcium carbonate
59
Hydraulic rams are powered by
water
60
well casing installed with
concrete as grout
61
back flow of non potable water may occur by
backpressure, backsiphonage
62
flushometer valve protected by
non pressure type vacuum breaker
63
resettling reservoirs for turbidity or pollutions retention time
2-3 days
64
activated carbon powdered form, tastes and odors are removed by
adsorption
65
water borne diseases worldwide
excess of 250 million illnesses/yr
66
residential cesspool and septic absorption system discharge
400 millions gallons into ground each year
67
leaching from garbage dump found to pollute wells
2,000 ft away
68
Drinking water hardness desirable at
50-80mg/1
69
Alkalinity desirable at
0-5mg
70
water system serving 1 apartment with 3 apartments total and sic residents
not a public water system
71
major regulatory requirements for safe drinking water act
public info
72
not included in nine containment groups
microorganisms
73
not classified as a sedimentary formation
olivine
74
serpentine, slate, soapstone, marble
metamorphic
75
soil that has greater porosity
silt
76
chem used to dechlorinate water
sodium thiosulfate
77
fecal contamination
coliform
78
soil that is most favorable for removal of viruses
fine loamy sand over course sand and gravel
79
MBAS test for
detergents containing phosphates
80
2 elements that cause most hardness
CA, MG
81
least desirable test for chlorine
OTA
82
not sued as a coagulant
sodium hydrochlorite
83
not know as a iron bacteria
girardia lambia
84
worst pipe damage from corrosion
soft water, low alkalinity, presence of oxygen
85
facultative bacteria
live in both anaerobic and aerobic conditions
86
primary organism in chloroform test
E coli
87
not a measure of turbidity
siple tubidity unit
88
another name for epsom salt
magnesium sulfate
89
biochem oxidation of ammonia yields
nitrate
90
associated with methemoglobinemia
nitrate
91
drinking water additives is responsibility of
EPA
92
lake characteristics being clean, high in DO, deep
oligotrophic
93
organisms most resistant to unfavorable environments
clost Sporulates
94
Algae will not cause
fall in PH
95
presence of bacteria responsible for typhoid fever
fecal contamination
96
tastes and odors due to presence of
algae, protozoa
97
Hydrogen sulfide fatal at
300ppm
98
microbial pollution only travel short distance through
sandy loam and clay
99
Hep A caused by
Virus
100
1 X 10-8 Moles liters
8
101
Used as a coagulant in water treatment
aluminium sulfate
102
disinfecting ability is most affected by
hydrogen ion concentration
103
improperly located wells may lead to
salmonellosis, shigella, chlorea, hepatitis
104
Hep B is associated with
blood particles
105
water treatment came from need to control
typhoid
106
typhoid, chlora, shigella, commonly transmitted by
fecal oral vehicle borne
107
does not provide residual
ozone
108
aeration is advantageous in treatment containing
dissolved iron, manganese
109
masonry reservoirs and rural water supplies are called
cisterns
110
liquid form of chlorine in emergency is called
sodium hydrochlorite
111
ground water that is likely to travel the furthest is
limestone
112
presence of coliform indicates
presence of pathogens
113
evidence of colorifom in MPN test
presence of gas from fermentation
114
presence of e coli
human fecal contamination
115
activated carbon used for
control taste and odors
116
physical cross connection
may prevent potable from an unportable source
117
backsiphonage is likely result of
potable with non potable used for fire fighting
118
positive water test is proof that the water contains
coliform and unsafe to drink
119
DPD test
Chlorine and bromine
120
if hardwater is softened with ion exchange what will increase
sodium
121
obtaining water sample
open for 2-3 minutes, hold bottle near base, fill to within 1 inch of top
122
number of sample submitted is determined by
population size
123
type of filter recommended for small communities
slow sand filter
124
aeration is a natural process which
increases contact with air and water, improves physical and chem characteristics of water
125
main function of sand filter
remove suspended solids
126
chlorine contact of 30ppm is
excessive
127
gases that encourage corrosion are
oxygen and carbon dioxide
128
ozone is effective against
cysts, bacterial phenols and viruses
