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6.7 WASTEWATER QUANTITY Wastewater quantity varies hourly, daily and weekly.

6.7 WASTEWATER QUANTITY Wastewater quantity varies hourly, daily and weekly. Peak flow occurs at maximum flow for the day. Definitions: Sewage – any liquid discharge normally from domestic sources Sewer – any line of pipes or channels used to convey sewage and effluents

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6.7 WASTEWATER QUANTITY Wastewater quantity varies hourly, daily and weekly.

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  1. 6.7 WASTEWATER QUANTITY Wastewater quantity varies hourly, daily and weekly. Peak flow occurs at maximum flow for the day.

  2. Definitions: Sewage – any liquid discharge normally from domestic sources Sewer – any line of pipes or channels used to convey sewage and effluents Sewage Treatment Plant (STP) – a site designed to treat sewage.

  3. Population Equivalent (PE) : The equivalent, in terms of fixed population of a varying or transient population or other activity eg. industrial or commercial contributing flow to the sewerage system. PE depends on type of premise and activity For example,

  4. Average daily flow = 225 litres per capita per day (225 lpcd) Peak Flow Factor (PFF) = 4.7 p –0.11 where p is population equivalent (PE) in thousand Peak Flow = PFF x average daily flow

  5. Example A new residential area consists of the following premises: Calculate the average daily flow of sewage and the peak flow rate from the residential area

  6. Solution Determine the total PE

  7. Average daily flow = 16940 x 225 lpcd = 3811.5 m3/day Peak Flow Factor = 4.7 p –0.11 = 4.7 x 0.733 = 3.445 Peak flow rate = 3.445 x 3811.5 m3/day = 13131 m3/day

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