Reducing Cr6+ in electroplating wastewater with Bacillus cereus strain B1
In this study Bacillus cereus was used to evaluate the Cr6+reducing capacity in electroplating effluents. The Cr6+bioreduction assays were carried out using real wastewater (RWW) from an electroplating plant and artificial wastewater (AWW), with and without added glucose. The AWW was prepared us...
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| Format: | article |
| Langue: | EN ES |
| Publié: |
Pontificia Universidad Javeriana
2019
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| Accès en ligne: | https://doaj.org/article/32bc7ade996f486693ad0b449ce90447 |
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| Résumé: | In this study Bacillus cereus was used to evaluate the Cr6+reducing capacity
in electroplating effluents. The Cr6+bioreduction assays were carried out
using real wastewater (RWW) from an electroplating plant and artificial
wastewater (AWW), with and without added glucose. The AWW was prepared
using Ni, Zn, Cu, Pb, and Cr salts, simulating RWW concentrations. The
Cr6+concentration and bacterial growth were monitored three times a day for
the duration of five days. Also, were evaluated the effects of wastewater on
B. cereus B1 morphology using scanning electron microscopy. Cr6+reduction
percentage of 100 % was reached for AWW containing glucose, of 71 % for
AWW without glucose, of 75.6 % for RWW with glucose, and of 31.7 % for
RWW without glucose. Despite the low reduction percentage obtained for
RWW without glucose, concentrations of ± 0.14 mg/L of Cr6+were reached,
which were within allowed limits (0.5 mg/L of Cr6+). Electron Microscopy
showed alterations in the bacterial cell wall and a decrease in size, mainly in
the bacteria exposed to RWW. The results allow us to propose B. cereus B1
as a
promising microorganism for use in the bioremediation of effluents containing
Cr6+. |
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