Unformatted text preview: TSS =397.3kg/d / 0.85 = 467.4 kg/d (marks not taken off for leaving as VSS)
O2r = Q(So-S)- 1.42Px = 3800 m3/d (200- 11.3mg/l)/1000 - 1.42(397.3kg/d) = 152.9 mg/L 5.) Design an aerated lagoon that would treat the Galt wastewater to achieve typical final
effluent BOD5 concentrations. Clearly identify all assumptions and sources of information.
In the design you should estimate TSS production. Assuming that the solids are settled in a
downstream settling pond to a solids concentration of 30% solids (300 g/L), how much
lagoon volume would be filled annually.
Answers vary- see tutorial 5 for general feedback
6.) An activated sludge process is operated for bCOD removal only. Given the following information on
the wastewater properties and the operating conditions, estimate the following:
Wastewater Flow = 65000 m3/day
Aeration basin volume = 30,000 m3
Solids residence time = 5 days BOD5
400 Wastewater properties (mg/L)
325 Assume b...
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- Fall '14
- Environmental Engineering, Sewage treatment, mg/L, xm, Activated sludge