Abstract

MIRANDA-RIOS, M; LUNA-PABELLO, VM; ORTA DE VELASQUEZ, MT  and  BARRERA-GODINEZ, JA. Removal of Escherichia coli from biological effluents using natural and artificial mineral aggregates. Water SA [online]. 2011, vol.37, n.2, pp.213-220. ISSN 1816-7950.

Ability for disinfecting sterile biological effluents inoculated with Escherichia coli ATCC 25922 at concentrations of 10⁵ CFU/mℓ, using a natural mineral aggregate (NMA) and artificial mineral aggregates (AMA's) consisting of individual oxides as FeO, CuO y Ag₂O and combined oxides as Fe₂O₃-Cu₂O, Fe₂O₃-Ag₂O, Cu₂O-Ag₂O, Fe₂O₃-Cu₂O-Ag₂O, contained alginate beads, was compared. The results indicate that Ag₂O and Fe₂O₃-Ag₂O, Cu₂O-Ag₂O combinations, as well as NMA, inactivated 100% of E. coli in 30 min, whereas the oxides mixture, Fe₂O₃-Cu₂O-Ag₂O, took 13 min. It was observed that redox potential values were closely related to the disinfection level achieved. The advantage resulting from using alginate beads was that these allow the formation of AMA, which has higher disinfectant ability relative to NMA.

Keywords : disinfection; biological effluent; Fe₂O₃; Cu₂O and Ag₂O; alginate beads; Escherichia coli; natural mineral aggregate; artificial mineral aggregate.

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