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Unformatted text preview: The bioreactor effluent is characterized and found to have the following properties:
- Volatile Suspended Solids (Biomass) Concentration = 300 mg VSS/L
Soluble BOD5 Concentration = 25 mg BOD5/L
Assume COD/VSS ratio for grown biomass is 1.42 mg COD/mg VSS Estimate the mass flow of oxygen that was consumed by the biomass in the bioreactor.
O2 Required = bCODremoved - bCODbiomass
= Q (So - S) - 1.42mgCOD/mgVSS * Px
Note: Please try out the above form (the method from previous will work, but try and be
comfortable with both)
Where Px = QXvss
O2 Required = Q (So - S - 1.42VSS)
= 1000 m3/d [ 800mg/l - 40mg/l - 1.42(300 mg/l)] (1000l/m3)(1 kg/10^6 mg)
= 334 kg/d
2.) An aerated lagoon is currently treating a wastewater at a temperature of 17oC. A...
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This document was uploaded on 02/10/2014.
- Fall '14
- Environmental Engineering