Abstract
A continuous treatment process was developed to investigate the capability of genetically engineered E. coli to simultaneously accumulate mercuric ions and reproduce itself in a continuous stirred tank reactor (CSTR) system. The influence of dilution rate and initial Hg 2+ concentration on continuous process was evaluated. Results indicated that the recombinant E. coli could effectively accumulate Hg 2+ from aqueous solution with Hg 2+ removal ratio up to about 90%, and propagate its cells at the same time in the continuous treatment system under suitable operational conditions. A kinetic model based on mass balance of Hg 2+ was proposed to simulate the continuous process. The modeling results were in good agreement with the experimental data.
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