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Dynamic simulation and experimental
validation of single and multi-metallic solutions in the biosorption of heavy metals in
membrane reactors: an overview In
this paper an overview on the use of membrane reactors to immobilise micro-organisms in a
stirred tank reactor during continuous heavy metal biosorption tests is presented.
Experimental data were collected in different operation conditions of pH and biomass
concentration both with single and binary metal solutions in membrane reactor apparatus
using Sphaerotilus natans as biosorbent. A dynamic model is developed on the base of
equilibrium adsorption data obtained by batch biosorption tests carried out in different
operation conditions. Comparison among experimental data and simulated profiles provides
the base for implementation of dynamic model as a fundamental mathematical tool in process
design of continuous biosorption systems. Multi-metallic biosorption experimental data and
simulations evidenced the adsorbent selectivity following the general order
Pb>Cu>Cd. Multi-stage configuration allows metal removal to be increased and it is a
possible alternative to separate the different metals contained in real polluted waste
streams in the different stages according to their affinity for the adsorbent active
sites.
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