Design of Oxidation Pond
1 MLD of wastewater with influent soluble BOD5 (So) = 75 mg/L, TKN = 13 mg/L (as N) and 2 mg/L phosphorus (as P) is to be treated in an oxidation pond such that effluent soluble BOD5 (S) is 5 mg/L. Calculate the oxidation pond surface area, assuming the depth of the pond to be 0.5 m. Calculate oxygen requirement for microbial respiration and oxygen supplied by algal growth, and check adequacy of the design by assuming that 50 percent of the oxygen produced by algal growth is available for microbial respiration. Neglect oxygen input into the pond by mass transfer from atmosphere. Calculate the effluent algal, effluent nitrogen and phosphorus concentration from the pond, and also calculate the total effluent BODU from the pond.
