Journal of Jishou University(Natural Sciences Edition) ›› 2011, Vol. 32 ›› Issue (2): 83-88.

• Chemistry and chemical engineering • Previous Articles     Next Articles

Potential Toxicity of the Residues from Indigenous Microorganisms Leaching of Heavy Metal Sediment


  1. (Hunan Research Academy of Environment Science,Changsha 410004,China)
  • Online:2011-03-25 Published:2012-04-09


Shaking flask experiments were used to study the indigenous microorganisms leaching of heavy metals from sediment in the optimum conditions,which were determined to be pH =3.0,65℃ and 7% pulp density.Residues from the bioleaching were analyzed through XRD and three-stage BCR sequential extraction procedure.Results show that heavy metal(Cd,Mn,Cu,Pb,Zn) contents sharply decrease over 7 days leaching,from 4 530 mg/kg,7 650 mg/kg,830 mg/kg,29 530 mg/kg,62350 mg/kg to 730 mg/kg,1280 mg/kg,390 mg/kg,13 810 mg/kg,15650 mg/kg respectively.Acid extractable percent content decreases remarkably during the bioleaching process;meanwhile,residual form percent content rises obviously.The environmental availability and potential risk of heavy metals are less than the standards listed in Hazardous Waste Distinguishable Standard (GB 5085.3-2007).Indigenous microorganisms can efficiently implement the resources and harmlessness of heavy metals in sediment.

Key words: heavy metal sediment, indigenous microorganisms, leaching, residues, environmental availability bility

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