Bioreduction of ionic mercury from wastewater in a fixed-bed bioreactor with activated carbon |
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Authors: | Paweł Głuszcz Katarzyna Zakrzewska Irene Wagner-Doebler Stanisław Ledakowicz |
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Institution: | (1) Bioprocess Engineering Department, Technical University of Lodz, 90-924 Lodz, Poland;(2) Helmholtz Zentrum fuer Infektionsforschung, HZI, 38124 Braunschweig, Germany |
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Abstract: | Wide industrial use of mercury led to significant mercury pollution of the environment. It requires development of cleanup
technologies which would allow treating large volumes of mercury contaminated water in a cost effective and environmentally
friendly way. A novel bio-technology, developed from laboratory to industrial scale in Germany at HZI (former GBF), is based
on enzymatic reduction of highly toxic Hg(II) to water-insoluble and relatively non-toxic Hg(0) using live mercury resistant
bacteria immobilized on a porous carrier material in a fixed-bed bioreactor. Improvement of the original method was based
on the use of activated carbon as a carrier for microorganisms and an adsorbent for mercury. Such integration of the process
should increase the technology efficiency. In order to compare different carrier materials, activated carbon and pumice stones
were used. The strain Pseudomonas putida was immobilized in bioreactors continuously fed with solutions of HgCl2 enriched with nutrients. Simultaneously, experiments in two more reactors were run in the absence of microorganisms to investigate
the influence of nutrients on the adsorption process. In the bioreactor with activated carbon, the outlet mercury concentration
was approximately 50 % of that supplied with pumice. It may be concluded that the use of activated carbon in a fixed-bed bioreactor
enables improvement of the technology by process integration.
Presented at the 34th International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 21–25 May
2007. |
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Keywords: | wastewater treatment mercury bioreduction bioremediation activated carbon process integration |
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