. Design and activated sludge process to treat 10MGD of domestic sewage having a BODs of 210 mg/liter, produce an effluent containing less than 15 mg/liter BODs. Assume a complete mix reactor. Use the following data in design. X, 10,000mg/liter, MLVSS=3,000mg/liter, 0,= 8 days, Y=0.60, kg 0.05, Efflunet SS-10 mg/liter Determine: (a) Biological treatment efficiency, (b) Reactor volume, (c) sludge production rate, (d) Recirculation ratio, (e) Hydraulic retention time, (f) Food to microorganism ration. (30 points)

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.