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Design a conventional activated sludge plant to treat domestic sewage, given the following data :

Population=40,000
Average sewage flow=180 lpcd
BOD of sewage = 240mg/lit
BOD removed in primary clarifier = 25%
Overall BOD reduction = 80%

Based on the information above, determine

  • a) Volume of acration tank.
  • b) Aeration period or H.R.T.
  • c) Sludge Retention Time
  • d) Tank dimensions
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