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wastewater collection Flashcards

1
Q

3 basic defense mechanisms to combat wasterwater diseases

A

sanitation
innoculation
isolation

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2
Q

2 factors that influence design of collection system

A

topography

wastewater flow

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3
Q

effects of high velocity flow in pipes

A

odor and corrosion

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4
Q

effects of low velocity in pipe

A

settling of solids

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5
Q

factors for pipe sizing

A

volume of wastewater

relative peak flow

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6
Q

maximum daily flow

A

2x

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7
Q

maximum hourly flow

A

3 to 4x

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8
Q

minimum daily flow

A

2/3

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9
Q

minimum hourly flow

A

1/3

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10
Q

pipe slope for residential 4 inch

A

2%

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11
Q

pipe slope for residential 6 inch

A

1%

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12
Q

pipe sizing for low pressure collection systems using holding tanks

A

1 -1.5

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13
Q

wastewater in gravity collection systems is carried from the building through a small diameter gravity sewer pipe to the sewer main in the street

A

service connections

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14
Q

service connection discharge wastewater into gravity flow, pipes cannot be less than 8 inches

A

lateral and branch sewer mains

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15
Q

main sewer connect to larger mains 8-12 inches

A

trunk sewers

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16
Q

trunk sewer discharges into

A

wastewater treatment system

17
Q

3 main part of low pressure collection system

A

valve
cleanout
air release system

18
Q

flow lift station equipped to handle

A

maximum peak hour flow

19
Q

spacing for small manhole

A

120m or 400ft

20
Q

spacing for large manholes

A

150m or 500ft

21
Q

diameter for manhole barrell

A

42-48 inch

22
Q

frequency on manhole inspection

A

once annually

23
Q

prevents wastewater from dropping on worker

A

drop manhole

24
Q

inflow or surface water and groundwater infiltration can cause the system to be hydraulically overloaded resulting in

A

surcharging resulting in flooded basements

25
Q

methods to detect inflitration

A

visual
smoke
dye
cctv

26
Q

methods to detect exfiltration

A

cctv

smoke

27
Q

direction to pull cctv

A

direction of flow, downstream

28
Q

smoke test to determine

A 
illegal connection
lost manhole
broken sewer
connection to residents
source of surface flow
29
Q

dye test to determine

A

illegal connections

30
Q

water table for smoke test

A

low

31
Q

lamping determines

A

pipe grading

32
Q

pumping frequency at lift station

A

20 mins

33
Q

electric motors are limited to how many stars

A

6 to8

34
Q

shreds debris and organic matter as wastewater passes through the rotating cutting edges

A

communutors / barminutors

35
Q

wastewater velocity must be greater than .6m/sec aka

A

scouring velocity

36
Q

frequency of isolation valve inspection

A

annually

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