Immobilized Zoogloea and zooglan in calcium alginate-silica matrix was
shown to have a high adsorption capacity for Cu and Cd ions. Our resu
lts showed that Cu-ion uptake in the presence of Ca and Mg ions can be
enhanced using immobilized Zoogloea and zooglan. Heavy metal ion adso
rption efficiency decreased in the following order: Cu>Cd>Zn>Cr. The a
dsorbed metal ions were desorbed completely using sulfuric acid. Immob
ilized Zoogloea and zooglan which was repetitively regenerated adsorbe
d heavy metal ions without a loss of adsorption capacity.