For the sketch shown on page 20-67 in Figure P-20-24 , perform a heat balance on the digester designed in Problem 20-22. Is enough methane produced to heat the digester in January if the mean ambient temperature is –12oC? Assume conservative heat transfer coefficients for the building materials and a heat exchanger efficiency of 60%. The temperature of the sludge is 10C.
Problem 20-22
Determine the dimensions of Knight Falls’ anaerobic digester designed in Problem 20-20. Assume a depth of 10.0 m and a bottom slope of 1:3. Provide a floating cover. The floating cover diameters are sold in 1.5 m increments.
Problem 20-20
In the preliminary analysis of alternatives for stabilizing the mixture of primary and WAS sludge from Knight Falls’ activated sludge plant, your boss has asked you to design an anaerobic digester. Determine the volume of the digester, the flow rate of methane, and the volume of an external tank pressurized to 350 kPa. Use the data from Problem 20-18 and the following data for this design:
Problem 20-18
In the preliminary analysis of alternatives for stabilizing a mixture of primary and WAS sludge from Knight Falls’ activated sludge plant, your boss has asked you to design an aerobic digester. The sludge flow rate is 404 m3/d. The solids concentration 2.8% and the specific gravity of the sludge is 1.01. Use the following data for the design:
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