WASTE LIQUID TREATMENT METHOD, WASTE LIQUID TREATMENT APPARATUS AND WASTE LIQUID REUSE METHOD

摘要

PROBLEM TO BE SOLVED: To solve such a problem that as a method for treating waste liquid containing inorganic salt, a method for recovering an acid solution and an alkaline solution from the waste liquid using a bipolar electrodialyzer is known, however when the waste liquid contains noble metal such as silver, a noble metal colloid is formed in the waste liquid, resulting in significant reduction in efficiency for recovering the acid solution and alkaline solution even using the electrodialyzer.SOLUTION: A noble metal-containing alkaline waste liquid treatment method comprises: a filtration step of filtering noble metal-containing alkaline waste liquid, thereby removing and recovering the noble metal contained in the waste liquid; and a recovery step of electrodialyzing the waste liquid after being subjected to the filtration step, thereby recovering the acid solution and alkaline solution. The above problem is solved by the noble metal-containing alkaline waste liquid treatment.SELECTED DRAWING: Figure 1