ENVE 4005 Midterm: Exam-ENVE4005-2003December
31 Jan 2019
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U n i v e r s i,t y v~ Department name & course number: civil and environmeljltal. Students must count the number of pages in this examination question paper before beginning write, and report any discrepancy to a proctor. In addition to this question paper, students require: an examination booklet a scantron sheet yes~ yeso nod no~ 1- design an aerated lagoon to treat 10,000 m3 of wastewater under the following conditions: ~) oxygen concentration to be maintained = 2. 0 n\g/l: lagoon depth = 2m, hydraulic residence time = 10 d, temperature proportionality constant f= 0. 5. Determine the surface area, summer and winter temperatures in the lagoon, and the effluent bod5 in summer and winter. If the growth yield is approximately 0. 5 (bod5 basis), determine the biological solids concentration in the lagoon, the oxygen requirements and the power requirements for summer and winter conditions. Use surface aerators rated at 1. 5 kg 02/kw. h.
