Inderscience Publishers

Treatment of metal ions and metalchelate complexes in water with biologically produced H2S

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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 Pb
2+
and Cu
2+
. The results clearly indicate that chelate washing and the subsequent precipitation is a viable technology.

Keywords: metal ions, metal chelates, SRB, sulphate–reducing bacteria, precipitation, remediation, CDTA, DTPA, EDTA, NTA, metal sulphides, lead, copper, heavy metals, soil pollution, environmental pollution, chelate washing, hydrogen sulphide

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