Treatment of metal ions and metalchelate complexes in water with biologically produced H₂S
by Torbjörn Håkansson; Staffan Sjöberg; Bo Mattiasson
International Journal of Environment and Waste Management (IJEWM), Vol. 9, No. 3/4, 2012

Abstract: The possibility to precipitate Pb and Cu as metal sulphides has been investigated. The metals are present as metal chelates, a situation that will appear after soil washing for remediation of polluted soil. Sulphide for the precipitation step is obtained via a bioreactor containing Sulphate-Reducing Bacteria (SRB). The effects on the precipitation process for copper and lead were studied in the presence of four different chelating substances (EDTA, NTA, CDTA, DTPA), with a precipitation of more than 98% for both Pb²⁺ and Cu²⁺. The results clearly indicate that chelate washing and the subsequent precipitation is a viable technology.

Online publication date: Sat, 13-Dec-2014

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