1) jar tests were perfomed on untreated river water. an optimum dose of 12.5 mg/L of alum was determined. determine the amount of natural alkalinity(mg/L as CaCO3) consumed. if 50 x 10^6 gal./ day of raw water are to be treated, determine the amount of alum required(kg/yr)
2)a mechanical rapid-mix tank is to be designed to treat 50 m^3 / day of water at a temperature of 12C. using typical design values in the chapter, determine the tank volume and power requirement
3) calculat the settling velocity of a particle with 10 um diameter and a specific gravity of 1.05 in 15C water. assume stokes law behavior will apply for you calculationns, but verify that stokes law is valid for this problem. if not, indicate why stokes law is not valid for this problem.