HEAVY-METAL REMOVAL METHOD AND HEAVY-METAL REMOVAL DEVICE

摘要

Provided are a heavy-metal removal method and a heavy-metal removal device,which are capable of reducing the amount of a neutralizing agent to be used.In aneutralization tank provided with a vertical-type cylindrical reaction vessel110, stirringblades 120 arranged in the reaction vessel 110, and an annular aeration tube130 havinga large number of air outlets 131 and being arranged to a bottom part of thereactionvessel 110, aeration is performed by introducing gas for oxidation from alarge numberof air outlets 131 of the aeration tube 130 while stirring an aqueous solutioncontainingat least one kind of ion of a divalent ferrous ion and a divalent manganeseion as aheavy metal element by rotation of the stirring blades 120, and the aqueoussolution issubjected to a neutralization treatment.