To improve the performance of the digester in Problem 20-13, it has been proposed that a more uniform feed be employed by using a clock control to operate a pump for 5 minutes at an interval of 96 minutes. Determine the pumping flow rate and the approximate number of cycles per day. (The spreadsheet solver tool may be useful for this solution.) Use this flow rate to select a pipe diameter and estimate the friction headloss.
Problem 20-13
Select a pipe diameter and estimate the friction headloss for pumping 38,500 kg/d of a thickened mixture of primary and activated sludge that has a solids concentration of 6% and a specific gravity of 1.03. The sludge is to be pumped 112 m to an anaerobic digester. Assume a Hazen-Williams C = 100 and a pumping time of 1/2 hour once per day.
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