Q1) A city discharge 629 ft³/sec of sewage into a river whose flow rate is 5040 m³/hr. Determine the deficit in oxygen for a distance 25km downstream , Critical DO , Minimum DO, Critical distance. River Waste BOD8 = 4 mg/l Temperature = 21 °C DO=7.5 mg/l K2,200 = 0.4 day¬1 BOD4 = 60 mg/l Temperature = 25 °C DO=1.5 mg/l K1,200 = 0.23 day-1 %3D Velocity of mixing = 0.20 m/sec %3D Temp. DO sat 18 20 22 23 24 25 26 9.54 9.17 8.99 8.83 8.53 8.38 8.22

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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.