2 A Municipal Wastewater Treatment Plant Processes An Average Flow Of 12 000 M D The Wastewater Contains 215 Mg L Bods 1 (38 KiB) Viewed 35 times
2. A municipal wastewater treatment plant processes an average flow of 12,000 m/d. The wastewater contains 215 mg/L BODs and 230 mg/L Suspended Solid. Determine the following for a circular primary sedimentation tank with a 16-m diameter. Determine (a) Surface overflow rate and the approximate removal efficiency for BODs and Suspended Solids at average flow, and (10 marks) (b) Mass of solids (kilograms per day) that is removed as sludge for average flow conditions. (5 marks)
(c) A water filtration unit is designed to use Anthracite, Silica Sand, and Garnet as the filter media. Draw a diagram to clearly show the distribution of the above three media (from 0 to 100% as x-axis) versus the bed depth (from tank top to bottom as Y-axis) after backwash. (5 marks) 80 70 Suspended solids 60 50 Percent removal 40 BOD 30 20 10 20 80 100 40 60 Overflow rate, m/d
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