Question

Problem 1. The alkalinity in raw water entering a drinking water plant can decrease during sig- nificant rainfall events. Jar tests showed an optimal alum (MW 594) dosage of 35 mg/1. If the raw water contains an alkalinity concentration of 25 mg/1 as CaCOs and a pH of 7.5, does sufficient alkalinity exist to buffer a decrease in pH?

Answer 1

Data -kom the GPven quedKơn H, alum muau) dwa ge of šs mgli al tonity concen ha kn of s mgl ca co,3 and pH,-7y" then we have / 36 6 saru -Hue pso du ce alka linity of (a coる: 366 ma/das caco3 "The x so 300 mg as Caco3

2 呂Do Sau then 2 we have 0 Aitaht pren o the wak 69 m Henre