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DESIGN OF WASTEWATER TREATMENT PLANT

DESIGN OF WASTEWATER TREATMENT PLANT . Activated Sludge Design. Aeration Tank Loading. Aeration period = Detention time = V/Q BOD loading per unit volume (g/m 3 .d) Interrelated with aeration period Dependent on the concentration of BOD in the wastewater and volume of aeration tank

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DESIGN OF WASTEWATER TREATMENT PLANT

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  1. DESIGN OF WASTEWATER TREATMENT PLANT Activated Sludge Design

  2. Aeration Tank Loading • Aeration period = Detention time = V/Q • BOD loading per unit volume (g/m3.d) • Interrelated with aeration period • Dependent on the concentration of BOD in the wastewater and volume of aeration tank • F/M ratio = Q x BOD (g/m3) V x MLSS (g/m3) Where: MLSS = Mixed Liquor Suspended Solid F/M ratio = Food to Microorganism Ratio = BOD Loading in proportion to Microbial Mass in the systems.

  3. Removal Efficiencies BOD removal = SS removal =

  4. Sludge Age Sludge age = MLSS (mg/L) x V (m3). SSe x Qe + SSw x Qw Where: Sludge age = Mean cell residence time. Also can expressed in terms of volatile suspended solids. SSe = Suspended Solids in Wastewater Effluent SSw = Suspended Solids in Waste Sludge

  5. Return sludge rate Expressed as percentage of raw wastewater effluent. Return sludge age = Recirculation flow Wastewater flow

  6. Example:

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