Problem

Stabilization pond computations are required for the town of Nancy (Problem 12.31).(a) Cal...

Stabilization pond computations are required for the town of Nancy (Problem 12.31).

(a) Calculate the lagoon area required for a design loading of 40 lb of BOD/acre/day.


 (b) Determine the percentage of the average design flow that appears as effluent from the lagoons, assuming a water loss from the ponds of 60 in./yr (seepage plus evaporation minus precipitation),


(c) Using the water-balance data from part (b), calculate the BOD removal efficiency if the average BOD concentrations in the influent and effluent are 250 mg/l and 25 mg/l, respectively,


 (d) How many acres of cropland are needed to dispose of the effluent by spray irrigation if the application rate is 2.0 in/week year-round?

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