Tratamiento fotocatalítico de aguas residuales generadas en laboratorios con presencia del indicador verde de bromocresol
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Date
2011
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. The advance of heterogeneous photocatalysis as an advanced oxidation process has
been used in the treatment of water contaminated
with recalcitrant substances, which bring negative
impacts to the environment and, in consequence,
to human health.Given the urgent necessity of preserving water as a natural resource, heterogeneous
photocatalysis was used in this research work to
treat effluents generated in chemical and environmental research laboratories. Objetive. To apply
heterogeneous photocatalysis by the use of TiO2
to
treat waste water with bromocresol green. Materials
and methods. Batch type reactors were used in
this process. Titanium dioxide (TiO2
) Degussa P-25
was used as a catalyst and natural UV radiation was
taken as the source to activate the photocatalytic
method to generate the discoloration and mineralization of the bromocresol green indicator in the liquid effluents.The process was followed up by pH
tests;Absorbance by the use of a spectrophotometer
(418 nm wave length) and COD by the technique
suggested by Standard Methods, every day during
a five days period. Results. The comparison of the
data obtained shows the feasibility of the technique,
especially by the use of a 300 ppm concentration
of catalyst, obtaining a 93,94% of degradation and
a 72.22% of mineralization. Conclusion. With the results of degradationand mineralization percentages obtained, it is evident that heterogeneous photocatalysis, using sunlight, is an advanced oxidation
process useful to treat waste water with bromocresol
green indicator.
Description
Keywords
Fotocatálisis, Corporación Universitaria Lasallista, Fotocatálisis heterogénea, Tratamiento de aguas residuales, Aguas residuales, Dióxido de titanio (TIO2), Radiación UV natural, Verde de bromocresol