A seeded BOD test is to be conducted on a poultry- processing waste with an estimated 5-day value of 600 mg/l. The seed taken from an existing preparation tank at the industrial site has an estimated BOD of 200 mg/l.
(a) What sample portions should be used for setting up the middle dilutions of the wastewater and seed tests?
(b) Compute the BOD value for the poultry waste if the initial DO in both the seed and sample bottles is 8.2 mg/l and the 5-day values are 3.5 mg/l and 4.0 mg/l for the seed test bottle and seeded wastewater sample, respectively. Use the volumetric additions from part (a) and assume that the volume of seed used in the waste BOD bottle is 10 percent of that used in the seed test.
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