HEAVY-METAL REMOVAL METHOD AND HEAVY-METAL REMOVAL DEVICE
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United States of America Patent
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Nov 5, 2015
app pub date -
Nov 22, 2013
filing date -
Dec 11, 2012
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Abstract
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 a neutralization tank provided with a vertical-type cylindrical reaction vessel 110, stirring blades 120 arranged in the reaction vessel 110, and an annular aeration tube 130 having a large number of air outlets 131 and being arranged to a bottom part of the reaction vessel 110, aeration is performed by introducing gas for oxidation from a large number of air outlets 131 of the aeration tube 130 while stirring an aqueous solution containing at least one kind of ion of a divalent ferrous ion and a divalent manganese ion as a heavy metal element by rotation of the stirring blades 120, and the aqueous solution is subjected to a neutralization treatment.
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