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NEHA RS Test > Wastewater > Flashcards

Wastewater Flashcards

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
Q

Loam is mixture of gravel, sand, silt, and clay containing

A

decayed plant and animal matter

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26
Q

degree of eutrophication of a lake indicated by

A

quantity of plankton algae, reduced water transparency, Do in water near surface

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27
Q

best assurance for septic tank design and constructed

A

proper maintenance

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28
Q

after septic tank cleaned it should not be scrubbed because

A

sludge stickpin to sides act as seeding effect in renewing bacteria, it would be considered a safety hazard

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29
Q

one of the most important factors contributing to transmission of microbiological agents is

A

concentration of dose microorganisms

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30
Q

when stomp’s water and domestic enter same sewer its known as

A

combined sewer

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31
Q

loam is composed of

A

sand, gravel, silt

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32
Q

most common method of applying wastewater

A

spray irrigation

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33
Q

plants employing trickling filter, sludge, spray irrigation present possible health hazard by

A

inhalation

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34
Q

not explosive component of sewer gas

A

carbon dioxide

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35
Q

soils most suitable for subsurface absorption

A

yellow, brown, red

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36
Q

least important to reducing sewage to soil and liquids and gases

A

anaerobic

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37
Q

Amount of Do required in aerobic decomposition is messed in ppm and is used to determine strength of wastewater is

A

BOD

38
Q

Disinfection or chlorination of sewage effluent is

A

an added safeguard risk reduce risk of transmission.

39
Q

Consumable plant products may present a health hazard if the water contains

A

cadmium

40
Q

measure of relativity constant rate at which clear water will seep out of a test hole that was previously saturated is

A

Perc test

41
Q

the ability of soil to absorb and allow water and air to pass through is related to

A

chem composition, texture, granular structure.

42
Q

the ability of soil to absorb water and air to pass thru is

A

permeability

43
Q

most effective method of running a perf test is

A

make test holes that have been filled with water overnight

44
Q

deep sludge depth and this fog layer, appearance of particle in the effluent is indication of

A

septic needs cleaning

45
Q

non toxic to aquatic organisms, good viricude, add oxygen

A

ozone

46
Q

suitability of soil test

A

perc test

47
Q

soil that is brown and red indicated

A

soil packed tight and lack of aeration

48
Q

sand filters, elevated systems, aeration systems, ands, lagoons are

A

sometimes used where soil is unsuitable

49
Q

in order to obtain reproducible results

A

soak gravel with water before test is made

50
Q

Ph of Secondary treatment effluent should be

A

6-9

51
Q

Facultative bacteria can live

A

in both aerobic and anaerobic

52
Q

man made organic compounds that degrade very slowly are referred to as

A

refractory compounds

53
Q

Sand filter is sued to

A

remove suspended solids and remove bacteria

54
Q

sewer gas may contain

A

H2S methane chlorine

55
Q

brine from water softening units as low as _ may inhibit bacteria in septic tanks

A

1.2 percent

56
Q

Septic tank cleaners

A

their use is not advised

57
Q

cesspool is prohibited by

A

greatest potential for groundwater contamination

58
Q

typical limited use for groundwater absorption field is due to

A

soil type and size

59
Q

the NODAK system is

A

designed to protect ground water

60
Q

traditional absorption field should be laid in trenches not more than _ below ground surface

A

24 in

61
Q

top of absorption field should be covered with

A

permeable material

62
Q

the field distrubution piping should be surrounded with __ and at lest 2 in deep under pipe

A

washed gravel 3/4 in to 2 1/4 in

63
Q

Distance between field lines in absorption field is a min of

A

6 ft

64
Q

2 factors that are commonly used to consider soil permeability or ability to absorb water

A

Perc test and soil characterisitics

65
Q

what is not considered suitable for a subsurface

A

clay

66
Q

2 factors that determine ground water contamination from septic tanks

A

soil characteristics and depth to ground water

67
Q

step that must be done to receive reproducible results

A

saturate soil before beginning the test

68
Q

septic tanks will

A

slow down the flow rate so solids can be settled

69
Q

duration for septic tanks should not be less than

A

24 hours

70
Q

residential septic tanks should be inspected

A

annually

71
Q

outlets and inlets in distribution boxes should

A

inlet should be 6 in higher than outlet

72
Q

gas that is found in sewers that is not explosive

A

CO2

73
Q

best single strength of measurement of polluted wastewater

A

5 day BOD

74
Q

Mature lake

A

mesotrophic

75
Q

Permissible 8 hour threshold for H2S

A

20 PPM

76
Q

most important step n wastewater

A

good housekeeping

77
Q

what is not considered domestic sewage

A

dairy cattle waste

78
Q

classified as a compound

A

ammonia

79
Q

Close perf second word is this name indicated its

A

class

80
Q

imhoff tanks are dependent on

A

bacteria decomposition

81
Q

rural subdivision what info would be utilized in determining which type of system

A

size of lot

82
Q

untreated surface disposal of residential is most likely to be cause of

A

Hepatitis

83
Q

5 day BOD test is performed when

A

conducting a series of tests to determine water pollution

84
Q

Soil profile of a site refers to

A

side view of soil horizon

85
Q

BOD ia a measure of biodegradable organic content of a water sample. its necessary to fill the bottle full

A

to precent addition oxygen from diffusing into the sample

86
Q

samples of BOD should be

A

refrigerated and tested in hours

87
Q

to prive in court pollution best would be

A

to show die placed in septic tank in the steam

88
Q

when sewage treat of lagoons are excafacted from fractured rock such as slate there is a dinger that

A

flow untreated through the rock fractures and contaminate aquafers

89
Q

Septic tank is sued to

A

slow down the movement of raw sewage

90
Q

principal purpose of a trap used in connection os a plumbing fixture is

A

prevent the entrance of sewer air and gases into house

91
Q

Hydrogen sulfide is fatal at

A

300 ppm

NEHA RS Test (8 decks)

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