TY - JOUR
T1 - Stability investigations of zinc and cobalt precipitates immobilized by in situ bioprecipitation (ISBP) process
AU - Satyawali, Yamini
AU - Schols, Edo
AU - Van Roy, Sandra
AU - Dejonghe, Winnie
AU - Diels, Ludo
AU - Vanbroekhoven, Karolien
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUK-C1-017-12
Acknowledgements: This work was funded by the LIFE financial instrument of the European Community (LIFE05 ENV/B/000517) coordinated by Umicore (http://www.vito.be/insimep). Moreover, this publication is also based on work supported by Award No. KUK-C1-017-12, made by King Abdullah University of Science and Technology (KAUST) (http://www.sowacor.nl/). The authors thank Raymond Kemps (Materials department, VITO) for the SEM-EDX analysis.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2010/9
Y1 - 2010/9
N2 - In situ bioprecipitation (ISBP), which involves immobilizing the metals as precipitates (mainly sulphides) in the solid phase, is an effective method of metal removal from contaminated groundwater. This study investigated the stability of metal precipitates formed after ISBP in two different solid-liquid matrices (artificial and natural). The artificial matrix consisted of sand, Zn (200mgL-1), artificial groundwater and a carbon source (electron donor). Here the stability of the Zn precipitates was evaluated by manipulation of redox and pH. The natural system matrices included aquifer material and groundwater samples collected from three different metal (Zn and Co) contaminated sites and different carbon sources were provided as electron donors. In the natural matrices, metal precipitates stability was assessed by changing aquifer redox conditions, sequential extraction, and BIOMET® assay. The results indicated that, in the artificial matrix, redox manipulation did not impact the Zn precipitates. However the sequential pH change proved detrimental, releasing 58% of the precipitated Zn back into liquid phase. In natural matrices, the applied carbon source largely affected the stability of metal precipitates. Elemental analysis performed on the precipitates formed in natural matrix showed that the main elements of the precipitates were sulphur with Zn and Co. © 2010 Elsevier B.V.
AB - In situ bioprecipitation (ISBP), which involves immobilizing the metals as precipitates (mainly sulphides) in the solid phase, is an effective method of metal removal from contaminated groundwater. This study investigated the stability of metal precipitates formed after ISBP in two different solid-liquid matrices (artificial and natural). The artificial matrix consisted of sand, Zn (200mgL-1), artificial groundwater and a carbon source (electron donor). Here the stability of the Zn precipitates was evaluated by manipulation of redox and pH. The natural system matrices included aquifer material and groundwater samples collected from three different metal (Zn and Co) contaminated sites and different carbon sources were provided as electron donors. In the natural matrices, metal precipitates stability was assessed by changing aquifer redox conditions, sequential extraction, and BIOMET® assay. The results indicated that, in the artificial matrix, redox manipulation did not impact the Zn precipitates. However the sequential pH change proved detrimental, releasing 58% of the precipitated Zn back into liquid phase. In natural matrices, the applied carbon source largely affected the stability of metal precipitates. Elemental analysis performed on the precipitates formed in natural matrix showed that the main elements of the precipitates were sulphur with Zn and Co. © 2010 Elsevier B.V.
UR - http://hdl.handle.net/10754/599709
UR - https://linkinghub.elsevier.com/retrieve/pii/S0304389410005789
UR - http://www.scopus.com/inward/record.url?scp=77954542204&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2010.04.119
DO - 10.1016/j.jhazmat.2010.04.119
M3 - Article
C2 - 20537795
SN - 0304-3894
VL - 181
SP - 217
EP - 225
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -