A two-stage stone-media trickling-filter plant was evaluated for the town of Nancy in Problem Determine the anaerobic digester capacity for stabilizing the sludge from this plant in two identical single-stage floating-cover tanks, and the required area for open-air drying beds for a northern state in the Great Lakes region. Using Eq. (13.11), calculate the volume required based on the following:
(a) The design quantity of raw sludge solids during the maximum month is the amount calculated by Eq. (13.4) using Eq. (12.37) and Eq. (12.38).
(b) A raw-sludge solids content of 4.0%, digested-sludge solids content of 6.0%, total solids reduction of 35%, and required storage period of 120 days. How does the calculated volume compare with the suggested capacity of 5 ft3/PE?
(c) Calculate the required area of open-air drying beds.
Problem:
Consider the feasibility of treating the wastewater from the town of Nancy (Problem in a single-stage stone-media trickling-filter plant as diagrammed in Figure 12.21. The treated wastewater is required to meet the effluent standards of 30 mg/l of BOD and 30 mg/l of suspended solids at a wastewater temperature of 15°C. Assume a primary BOD removal efficiency of 35%. Size the trickling filters based on a BOD loading of 35 lb/1000 ft3/day, recirculation ratio of 0.5, and a stone-media depth of 7.0 ft. Calculate the volume of filter media required, filter surface area, hydraulic loading with recirculation in gallons per minute per square foot, and effluent BOD concentration using the NRC formula.
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