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 A plant treats 30,000 liters of water per second and, in the sedimentation phase with coagulation, aluminum sulfate is used, the maximum concentration of which must not exceed 15 milligrams per liter of water. The maximum amount of this coagulant that can be used in the volume of water treated in one hour is

A) 270 kg.

B) 810kg.

C) 1 240kg.

D) 1 450kg.

E) 1 620kg.

V for velocity v for volume, C for concentration

V = 30000l/s;

C = 15mg/l;

Formula: V = v/t;            conversion of measures: 1h=3600s;

v = V x t -> v = 30000 x 3600s -> 36x3x10^6;

C = 15mg/l is 15 mg if one l than 36x3x10^6 is 36x3x10x15gx10^(-3) -> 1620ooog ->1620kg.

Rute Bezerra de Menezes Gondim