Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1993-11-22
1996-07-23
Hruskoci, Peter A.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210674, 210679, 210684, 210688, 210912, 210913, 210914, C02F 128
Patent
active
055386458
ABSTRACT:
A process for the removal of species containing metallic ions from effluents by yeast cell walls. The yeasts used are selected from Saccharomyces cerevisae, Saccharomyces uvarum and Saccharomyces lipolytica. According to the process, the washed yeast cell walls are first treated by a water soluble aldehyde and after sorbing the metallic ions, the yeast cell walls may regenerated by a mineral acid or a chelate solution such as ethylene-diamine tetraacetic acid, releasing the sorbed metal ions. According to a preferred embodiment, water containing acetone or alcohol is used for washing the yeast cell walls. The sorption by the yeast cell walls is carried out at a pH in the range of 1 to 13 and preferably in the range of 4 to 7. The most preferred aldehyde is selected from formaldehyde and glutaraldehyde or any mixture thereof. The metal sorption process may be carried out batchwise or continuously. In the continuous process, the yeast cell walls are immobilized on porous glass, purified sand or polymers.
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Meshulam Galit
Yannai Shmuel
Green Theodore M.
Hruskoci Peter A.
Technion Research & Development Foundation Ltd.
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