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Applied and Environmental Microbiology, December 1999, p. 5279-5284, Vol. 65, No. 12
Division of Microbiology, National Research
Center for Biotechnology (GBF), D-38124 Braunschweig, Germany
Received 13 July 1999/Accepted 15 September 1999
A mercury-resistant bacterial strain which is able to reduce ionic
mercury to metallic mercury was used to remediate in laboratory columns
mercury-containing wastewater produced during electrolytic production
of chlorine. Factory effluents from several chloralkali plants in
Europe were analyzed, and these effluents contained total mercury
concentrations between 1.6 and 7.6 mg/liter and high chloride
concentrations (up to 25 g/liter) and had pH values which were either
acidic (pH 2.4) or alkaline (pH 13.0). A mercury-resistant bacterial
strain, Pseudomonas putida Spi3, was isolated from polluted river sediments. Biofilms of P. putida Spi3 were grown on
porous carrier material in laboratory column bioreactors. The
bioreactors were continuously fed with sterile synthetic model
wastewater or nonsterile, neutralized, aerated chloralkali wastewater.
We found that sodium chloride concentrations up to 24 g/liter did not
inhibit microbial mercury retention and that mercury concentrations up
to 7 mg/liter could be treated with the bacterial biofilm with no loss
of activity. When wastewater samples from three different chloralkali
plants in Europe were used, levels of mercury retention efficiency
between 90 and 98% were obtained. Thus, microbial mercury removal is a
potential biological treatment for chloralkali electrolysis wastewater.
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Removal of Mercury from Chloralkali Electrolysis
Wastewater by a Mercury-Resistant Pseudomonas putida
Strain
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Corresponding author. Mailing address: GBF, Mascheroder
Weg 1, D-38124 Braunschweig, Germany. Phone: 49-531-6181 408. Fax: 49-531-6181 411. E-mail: iwd{at}gbf.de.
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