Each week an industry produces 2.0 × 10^3 m3/d of a strong acid waste (pH = 1.5) during a 48 hour production cycle (total 4.0 × 10^3 m3/week). The plant engineer would like to discharge the waste into a river that passes near the plant. The river has a 7-day, 10-year flow of 25 × 10^3 m3/d, an alkalinity of 150 mg/L as CaCO3, and a pH of 7.7. If the temperature of the mixture is 25oC, will it be possible to discharge all the waste into the river within a 7-day period if the river pH must be maintained above 7.0?
I'm trying to solve as if its a titration/buffer problem with the concentration of the [acid] being 10^-1.5 M and the CaCO3 of the river being 1.5 M (alkalinity/molar mass of CaCO3 which is 100). Then using the 2 volumes as 2.0 x 10^6 L of acid added a day to 25 x 10^6 L of river water.
Not really getting and answer that makes much sense though. Would appreciate any clarity anyone could provide!