Journal article
Dynamics of lead immobilization in sulfate reducing biofilms
Water research (Oxford), Vol.38(11), pp.2726-2736
2004
Handle:
https://hdl.handle.net/2376/110345
PMID: 15207603
Abstract
We have evaluated the effects of selected minerals present in subsoil environment on the efficiency of lead removal from contaminated groundwaters using biofilms composed of sulfate-reducing microorganisms, and examined the stability of metal deposits after the biofilms had been temporarily exposed to the air. To quantify the studied effects, lead was immobilized in biofilms of
Desulfovibrio desulfuricans grown anaerobically in two flat-plate flow reactors, one filled with hematite and the other with quartz. While the biofilms in both reactors were heterogeneous and consisted of voids and channels, the biofilms grown on hematite were denser, thicker, and more porous than those grown on quartz. The average H
2S concentrations, measured using microelectrodes, were higher in the biofilms grown on quartz than those measured in the biofilms grown on hematite. During 18 weeks of operation, iron was continuously released from the hematite. Lead was immobilized more efficiently in the biofilms grown on quartz than it was in the biofilms grown on hematite. Lead deposits were partially reoxidized, especially in biofilms grown on hematite, and the biofilms in both reactors responded to the presence of oxygen by lowering their density and increasing the H
2S production rate.
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Details
- Title
- Dynamics of lead immobilization in sulfate reducing biofilms
- Creators
- Haluk Beyenal - Center for Biofilm Engineering, Montana State University, P. O. 173980, Bozeman, MT 59717, USAZbigniew Lewandowski - Center for Biofilm Engineering, Montana State University, P. O. 173980, Bozeman, MT 59717, USA
- Publication Details
- Water research (Oxford), Vol.38(11), pp.2726-2736
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900547360301842
- Language
- English
- Resource Type
- Journal article