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Flashcards in Wastewater Flows Deck (15)
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1
Q

What is the equation for Mass Loading?

A
  • Concentration * flowrate
  • ML (kg/day) =(concentration, g/m^3)(flowrate, m^3/d)/ (10^3g/kg)
  • ML, lbs/d = (Concentrationmg/L)(flowrate, Mgal/d)(8.34lbs/Mgal * (mg/L)
2
Q

What is infiltration?

A

-groundwater thats seeps into a collection system from different points

3
Q

What is inflow?

A

-Rain water that enters publicly owned sewers and manholes

4
Q

What is Flow Equalization?

A

-Allows for constant to prevent overflow or suspended particles from settling.

5
Q

When is flow equalization used in wastewater treatment facilities?

A

-During peak times of the day of water usage

6
Q

What is Hydraulic Retention Time?

A

Volume per Flow rate

7
Q

What is a gravity sewer slope?

A

-2ft/sec

8
Q

What is mass loading used for?

A
  • important is in the design/ sizing of the wastewater units
  • mass of BOD that must be processed
9
Q

How are wastewater flow rates obtained for newly sewered areas?

A
  • analysis of the population

- est. per capita

10
Q

What is the weight of 1 gallon of water?

A

-8.34 lb

11
Q

What is the effect of infiltration& inflow?

A
  • Causes:
  • -> dilution in sewage
  • -> sewage volumes to exceed design capacity
  • -> decreases efficiency of sewers
12
Q

What is Manning equation?

A

-gives the velocity if flow in feet per second

13
Q

What are the types of wastewater collection system?

A
  • Sanitary
  • Storm
  • Combined
14
Q

What are the sources of waste water flow?

A
  • Domestic
  • Industrial
  • Infiltration/Inflow
15
Q

Average, Maximum, and minimum daily flow all account for what type of weather conditions?

A

-Dry weather