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Unformatted text preview: COD/BOD5 = 1.6
Biokinetics (at operating temperature)
75 mg bCOD/L
0.45 mg VSS/mg COD
0.15 mg VSS/mg VSS
Assume VSS/TSS for grown biomass = 0.85 a. Total suspended solids concentration in the aeration basin
Xio = nbVSS = (1- bpCOD/pCOD)VSS
bCOD = 1.6BOD5 = 1.6 (300mg/l) = 480 mg/l =So
pCOD = COD- sCOD = 600mg/l - 315mg/l= 285mg/L
bsCOD= 1.6sBOD5 = 1.6 (150mg/l) = 240mg/l
bpCOD = bCOD- bsCOD = 480mg/l - 240mg/l = 240mg/l
Xio = nbVSS = (1- bpCOD/pCOD)VSS = (1 - (240mg/l / 285mg/l)) 325mg/l= 51.3 mg/l vss
FSS = TSS- VSS = 400 mg/l - 325mg/l = 75mg/l b. Mass flow of volatile suspended solids in the waste stream
Solution: c. Oxygen requirements
OUR = Q (So-S) - 1.42Pxvss growth
= 65000 m3/d(480mg/l - 13mg/l)(1000l/m3)(1kg/10^6mg) - 1.42(9789.5kgVSS/d)
= 16453.9 kg /d...
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This document was uploaded on 02/10/2014.
- Fall '14
- Environmental Engineering