Reaction Engineering Aspects of Microbial Mercury Removal

Autor:	J. Leonhäuser, Irene Wagner-Döbler, M. Röhricht, W.-D. Deckwer
Rok vydání:	2006
Předmět:	MERCURE Environmental Engineering Chemical reaction engineering Cost effectiveness Fixed bed Chemistry Analytical chemistry Environmental engineering chemistry.chemical_element Bioengineering Dilution Mercury (element) Adsorption medicine Biotechnology Activated carbon medicine.drug
Zdroj:	Engineering in Life Sciences. 6:139-148
ISSN:	1618-2863 1618-0240
DOI:	10.1002/elsc.200620904
Popis:	Mercury-resistant microorganisms are widespread in natural environments and can effectively be used to demercurize Hg(II)-contaminated wastewaters as was already demonstrated on an industrial scale. The aim of this paper is to find the performance limits with regard to Hg(II) loadings D c Hg,in (dilution rate x Hg(II) inlet concentration) and residual Hg(II) at the reactor outlet and to provide a reasonable basis for an optimal and safe process design. To this end, comprehensive studies were carried out with different single microbes (natural isolates and a genetically engineered strain) as well as microbial consortia in batch and continuous stirred reactors and fixed beds with microorganisms immobilized as films. The rate of the biotransformation (reduction of inorganically and organically bound Hg(II) to elemental Hg(0)) was found to follow a uniform mechanism with inhibition kinetics (Haldane type). Both reactor types are able to cope with high Hg(II) loadings and yield conversions up to 98 %. The stirred vessel is particularly suited for high c Hg,in but restricted to low D (D
Databáze:	OpenAIRE
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