Method of treating waste liquor.

摘要

A method of treating a waste liquor comprises three stages. In the first stage, an acidic (or alkaline) waste liquor is treated in a first separating-by-evaporation process which comprises the steps of evaporating the acidic (or alkaline) waste liquor, and condensing the resulting vapor into an acidic (or alkaline) distillate, to thereby separate the acidic (or alkaline) waste liquor into solids and the acidic (or alkaline) distillate. In the second stage, the pH of the acidic (or alkaline) distillate is adjusted to an alkaline (or acidic) value. In the third stage, the resulting pH-adjusted distillate is treated in a second separating-by-evaporation process which comprises the steps of evaporating the pH-adjusted distillate, and condensing the resulting vapor into a distillate, to thereby separate the pH-adjusted distillate into solids and the distillate.