Question

1. A lagoon is to be designed to remove a nonconservative pollutant with an input flow of 150 m3/d, and the concentration is 20 mg/L. The volume of this lagoon is 3000 m², and the first order reaction rate of the pollutant is 0.20/day. Assuming it is a complete mixing, please calculate the pollutant concentration in the effluent. - (4 Marks). tt Assume that the gas above the soda in a bottle of soft drink is pure CO2 with a pressure of 2 atm. [Henry's Law] (a) Calculate [H2CO3] at 25 °C. ~ (2 Marks) (b) Calculate the pH of the soft drink. Start with the following chemical reaction and realize the solution will be somewhat acidic (negligible amount of carbonate). - H2CO3 + H+ + HCO3+ (4 Marks)

Answer 1

day ci=cong/L V = 3000 m2 K=0.2/day pollubent concentration in effluent be ca 9,9 = 0, C2+K.C.V 150x20=15ox Cto. 2X (2 x 3000 3000 = c2 (150+600) TC2=4mg/] -Please Give Rating -