| abstract |
(57) [Summary] [Problem] To collect environmentally friendly, inexpensive, stable, and efficient heavy and valuable metals from wastewater, waste or sediment containing heavy metals or valuable metals, and produce wastewater. To provide a treatment method for removing heavy metals or valuable metals from wastewater. SOLUTION: An aqueous solution or aqueous suspension is prepared by adding an organic aminocarboxylic acid in an equimolar amount or more to the amount of the heavy metal element to industrial wastewater, sludge or residual soil containing the heavy metal element, and further adding water as necessary. And then reacting the aqueous solution or aqueous suspension with an organic aminocarboxylic acid-decomposing bacterium, and collecting a heavy metal-containing precipitate or suspended matter generated by the action of the decomposing bacterium. . Further, the presence of an iron salt promotes biodegradation and promotes heavy metal removal. |