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NEHA RS Test > Wastewater > Flashcards

Wastewater Flashcards

(91 cards)

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1
Q

some pathogenetic organisms will survive from less in heat to more than in freezing

A

1-2 years

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2
Q

trickling filters can remove up to 90/95 % found in soil, water, and wastewater

A

bacteria, viruses and cholera

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3
Q

waste water used in home or community is expressed in

A

BOD, COD, suspended solids

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4
Q

Storm sewer used to

A

remove rain and other standing water

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5
Q

Stream pollution is apparent by

A

a zone of degradation

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6
Q

young lake is

A

oligotrophic

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7
Q

nutrients associated with eutrophication

A

phosphates, nitrogen, organic carbon

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8
Q

most fovorable method of domestic wastewater

A

connection to public sewer

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9
Q

wastewater from water closet and latrine is

A

black water

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10
Q

permeability of soil related to

A

chem composition, color, granular structure,

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11
Q

most accurate estimates if sewage flow is

A

annual water meter readings

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12
Q

grease traps installed for minimizing grease

A

not proven in commercial applications

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13
Q

septic tank primary functions

A

bio treatment, sedimentation tank, conditioning tank

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14
Q

detention time for septic tanks is

A

24-72 hours

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15
Q

septic tank garbage disposal

A

50% increase in size

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16
Q

septic tanks serving commercial operation inspected for cleaning

A

twice per year

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17
Q

Septage

A

mixture of gray water, sludge, scum

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18
Q

septic tank pumped inwater period

A

could float

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19
Q

how often private home septic tank be serviced

A

every 3-5 years

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20
Q

Human disease from aerosols

A

related to activated sludge, trickling, and spray irrigation

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21
Q

plans for area to be sewered

A

prepared by licensed engineer, include engineer report, include problems, design detail,

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22
Q

final disposal of sewage may not include

A

vegetable dumping

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23
Q

chem coagulation, flocculation, sediminations will remove all bacteria, virus, helminths if supplemented by

A

chlorination

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24
Q

sewage sludge should not be used as soil builder or fertilizer cause

A

it may result in higher levels of toxic metals in vegetation and animals eating it

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25
Loam is mixture of gravel, sand, silt, and clay containing
decayed plant and animal matter
26
degree of eutrophication of a lake indicated by
quantity of plankton algae, reduced water transparency, Do in water near surface
27
best assurance for septic tank design and constructed
proper maintenance
28
after septic tank cleaned it should not be scrubbed because
sludge stickpin to sides act as seeding effect in renewing bacteria, it would be considered a safety hazard
29
one of the most important factors contributing to transmission of microbiological agents is
concentration of dose microorganisms
30
when stomp's water and domestic enter same sewer its known as
combined sewer
31
loam is composed of
sand, gravel, silt
32
most common method of applying wastewater
spray irrigation
33
plants employing trickling filter, sludge, spray irrigation present possible health hazard by
inhalation
34
not explosive component of sewer gas
carbon dioxide
35
soils most suitable for subsurface absorption
yellow, brown, red
36
least important to reducing sewage to soil and liquids and gases
anaerobic
37
Amount of Do required in aerobic decomposition is messed in ppm and is used to determine strength of wastewater is
BOD
38
Disinfection or chlorination of sewage effluent is
an added safeguard risk reduce risk of transmission.
39
Consumable plant products may present a health hazard if the water contains
cadmium
40
measure of relativity constant rate at which clear water will seep out of a test hole that was previously saturated is
Perc test
41
the ability of soil to absorb and allow water and air to pass through is related to
chem composition, texture, granular structure.
42
the ability of soil to absorb water and air to pass thru is
permeability
43
most effective method of running a perf test is
make test holes that have been filled with water overnight
44
deep sludge depth and this fog layer, appearance of particle in the effluent is indication of
septic needs cleaning
45
non toxic to aquatic organisms, good viricude, add oxygen
ozone
46
suitability of soil test
perc test
47
soil that is brown and red indicated
soil packed tight and lack of aeration
48
sand filters, elevated systems, aeration systems, ands, lagoons are
sometimes used where soil is unsuitable
49
in order to obtain reproducible results
soak gravel with water before test is made
50
Ph of Secondary treatment effluent should be
6-9
51
Facultative bacteria can live
in both aerobic and anaerobic
52
man made organic compounds that degrade very slowly are referred to as
refractory compounds
53
Sand filter is sued to
remove suspended solids and remove bacteria
54
sewer gas may contain
H2S methane chlorine
55
brine from water softening units as low as _ may inhibit bacteria in septic tanks
1.2 percent
56
Septic tank cleaners
their use is not advised
57
cesspool is prohibited by
greatest potential for groundwater contamination
58
typical limited use for groundwater absorption field is due to
soil type and size
59
the NODAK system is
designed to protect ground water
60
traditional absorption field should be laid in trenches not more than _ below ground surface
24 in
61
top of absorption field should be covered with
permeable material
62
the field distrubution piping should be surrounded with __ and at lest 2 in deep under pipe
washed gravel 3/4 in to 2 1/4 in
63
Distance between field lines in absorption field is a min of
6 ft
64
2 factors that are commonly used to consider soil permeability or ability to absorb water
Perc test and soil characterisitics
65
what is not considered suitable for a subsurface
clay
66
2 factors that determine ground water contamination from septic tanks
soil characteristics and depth to ground water
67
step that must be done to receive reproducible results
saturate soil before beginning the test
68
septic tanks will
slow down the flow rate so solids can be settled
69
duration for septic tanks should not be less than
24 hours
70
residential septic tanks should be inspected
annually
71
outlets and inlets in distribution boxes should
inlet should be 6 in higher than outlet
72
gas that is found in sewers that is not explosive
CO2
73
best single strength of measurement of polluted wastewater
5 day BOD
74
Mature lake
mesotrophic
75
Permissible 8 hour threshold for H2S
20 PPM
76
most important step n wastewater
good housekeeping
77
what is not considered domestic sewage
dairy cattle waste
78
classified as a compound
ammonia
79
Close perf second word is this name indicated its
class
80
imhoff tanks are dependent on
bacteria decomposition
81
rural subdivision what info would be utilized in determining which type of system
size of lot
82
untreated surface disposal of residential is most likely to be cause of
Hepatitis
83
5 day BOD test is performed when
conducting a series of tests to determine water pollution
84
Soil profile of a site refers to
side view of soil horizon
85
BOD ia a measure of biodegradable organic content of a water sample. its necessary to fill the bottle full
to precent addition oxygen from diffusing into the sample
86
samples of BOD should be
refrigerated and tested in hours
87
to prive in court pollution best would be
to show die placed in septic tank in the steam
88
when sewage treat of lagoons are excafacted from fractured rock such as slate there is a dinger that
flow untreated through the rock fractures and contaminate aquafers
89
Septic tank is sued to
slow down the movement of raw sewage
90
principal purpose of a trap used in connection os a plumbing fixture is
prevent the entrance of sewer air and gases into house
91
Hydrogen sulfide is fatal at
300 ppm

NEHA RS Test (8 decks)

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