wastewater management l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Wastewater Management PowerPoint Presentation
Download Presentation
Wastewater Management

Loading in 2 Seconds...

play fullscreen
1 / 12

Wastewater Management - PowerPoint PPT Presentation


  • 149 Views
  • Uploaded on

Wastewater Management. Obj 6.3: Sewage Generation. Water Supply Usage. for most municipalities the amount of sewage will be about 60-75% of the water supply used. demand for fresh water peaks around 6:00 pm this is typically when PEAK SEWAGE FLOW RATE occurs. Peak Sewage Flow Rate.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Wastewater Management' - sanura


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
wastewater management

Wastewater Management

Obj 6.3:

Sewage Generation

water supply usage
Water Supply Usage
  • for most municipalities the amount of sewage will be about 60-75% of the water supply used.
  • demand for fresh water peaks around 6:00 pm
  • this is typically when PEAK SEWAGE FLOW RATEoccurs.
peak sewage flow rate
Peak Sewage Flow Rate

Is the total flow from all generators of sewage and includes:

domestic

commercial

institutional

infiltration

domestic sewage
Domestic Sewage

Qdomestic = A x PD x SGR x PF

A = residential area (ha)

PD = population density (persons/ha)

SGR = sewage generation rate (m3/person/day)

PF = peaking factor

peaking factor6
Peaking Factor

If sewage flow monitored from a subdivision was measured at 8,640,000 L for a 24 hour period and the measured flow rate at the time of peak usage was 0.22 m3/s:

Average flow rate =

Peaking Factor =

peaking factors pf
Peaking Factors (PF)
  • small towns have higher peaking of water use (high peaking factor)

200% to 500% of average flow rate

  • large towns have lower peaking of water use (low peaking factor)

150% to 250% of average flow rate

commercial and institutional sewage
Commercial and Institutional Sewage
  • wide variety of land use types and densities
  • great variation in sewage generation
  • Domestic Equivalent Estimation Method
  • Sewage Generation Rate Method
commercial institutional sewage
Commercial & Institutional Sewage

Qcom/inst= AC x SGR x PF

AC = area characteristic

SGR = sewage generation rate (m3/characteristic/day)

PF = peaking factor

infiltration
Infiltration
  • groundwater seeps into sanitary sewers through cracks and joints
  • surface runoff finds its way into manholes
  • infiltration amounts depend on quality of construction and age of system
infiltration11
defective joints

cracked pipes

water table level

manhole integrity

construction and inspection

maintenance and repair

Factors that affect infiltration rates

Infiltration
infiltration flow rates
Infiltration Flow Rates

Qinfiltration = A x IF

A = surface area (ha)

IF = infiltration rate (m3/ha/day)