Importance

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Abstract

An objective of invention is conveniently concentrating a metal in a metal ion-containing solution with high efficiency and to recover the metal from the metal ion-containing solution with high recovery efficiency. A method for concentrating or recovering a metal in a metal ion-containing solution in the present invention is the method comprising the following steps, a reduction and accumulation step to reduce the metal ion into a metal fine particle and also to accumulate the metal fine particle in the microorganism by allowing the microorganism and an electron donor B to act on a metal ion-containing solution W₀ and thus to obtain a solution W₁ that contains a microorganism having a metal fine particle accumulated therein; a concentration step to concentrate the solution W₁ that contains the microorganism having a metal fine particle accumulated therein by a filtration membrane and thus to obtain a concentrated solution W₂; and a return step to return the concentrated solution W₂ to first step above and thus to circulate. Further, A device for metal concentration or recovering in the present invention comprises the following: a storage unit 2 to store the solution W₁, a concentration unit 3 to concentrate the solution W₁ that is transferred from the storage unit 2 by a filtration membrane, and a return unit 4 to return a concentrated solution W₂ that is concentrated in the concentration unit 3 to the storage unit 2.

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First Claim