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Extracted text: Calculate the organic loading rate ( Ib volatile solids/day/ft3) for following given data: Digester volume 40,000 ft3, Raw sludge volume = 5,000 gpd, Sludge concentration = 5% %3D Volatile solids = 80%. Note: 1 ft = 7.5 gallons No matches found. Select one: a. 4.2 lb volatile solids/day/ft b. 2.42 lb volatile solids/day/ft3 C. 0.042 lb volatile solids/day/ft3 d. 0.42 lb volatile solids/day/ft3