In a large sulfide tailing pond, the average pH of overlying water is 2.0 due to…

In
a large sulfide tailing pond, the average pH of overlying water is
2.0 due to the oxidation process of sulfide minerals. According to
the environmental regulation, the pH of the mining waste water
needs to be neutralized before it can be discharged to the
environment. In a mining industrial process, the water is first
adjusted to basic solution with saturated lime solution (CaO), then
adjusted to a solution to around pH 7.0 with H2SO4. Assuming that
the water treatment plant needs to treat an average of 8600 cubic
meters of water per hour and the plant works 24 hours per day and 7
days per week, how many tones of CaO is needed per year (at a
minimum)? (Hint: in water, CaO +2H2O ó Ca(OH)2, and Ca(OH)2 ó Ca2+
+ 2OH-. Ksp of Ca(OH)2 is 5.5 x 10-6.) Atomic weight of Ca = 40.06,
of O = 15.9994, of H = 1.0079