| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of efficiently decoloring and purifying wastewater, which is a dark brown colored liquid containing organic components giving BOD and COD values, and lignin and/or tannin, without generating hazardous substances.SOLUTION: In the new decoloring and purifying method, iron chloride or iron sulfate and an alkali metal aluminate are added, and then, preferably, coagulation treatment using an organic polymer coagulant, an inorganic coagulant, or a composite coagulant comprising the organic polymer coagulant and the inorganic coagulant is carried out, and more preferably solid-liquid separation is additionally carried out. |
