Exploring bioaugmentation strategies for the decolourization of textile wastewater using a two species consortium (Bacillus cereus and Bacillus pumilus) and characterization of produced metabolites

Two bacterial strains, Bacillus cereus Bacillus pumilus, were isolated from the sludge of an aerobic reactor treating textile wastewater containing indigo dye. These strains were chosen as augmented decolourizers which were mixed in various ratios with the activated sludge and the effect of their co...

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Bibliographic Details
Published in:Desalination and water treatment 2012-07, Vol.45 (1-3), p.48-54
Main Authors: Khelifi, Eltaief, Touhami, Youssef, Thabet, Olfa Ben Dhia, Ayed, Lamia, Bouallagui, Hassib, Fardeau, Marie Laure, Hamdi, Moktar
Format: Article
Language:English
Subjects:
1H NMR analysis
Activated sludge
Applied sciences
Aromatic compounds
Bacillus
Bacillus cereus
Bacillus pumilus
Bacteria
Balancing
Bioaugmentation
Biodegradation
Color removal
Colour
Consortia
Decoloring
Decolorization
Decolourization
Dyes
Exact sciences and technology
High performance liquid chromatography
HPLC
Incubation period
Indigo
Liquid chromatography
Metabolism
Metabolites
Microbiological strains
Microorganisms
NMR
Nuclear magnetic resonance
Oxygen demand
Oxygen requirement
Pollution
Protons
Ratios
Removal
Response surface methodology
Sludge
Strains (organisms)
Textile industry wastewaters
Textiles
Waste water
Wastewater
Wastewater treatment
Water treatment and pollution
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Summary:Two bacterial strains, Bacillus cereus Bacillus pumilus, were isolated from the sludge of an aerobic reactor treating textile wastewater containing indigo dye. These strains were chosen as augmented decolourizers which were mixed in various ratios with the activated sludge and the effect of their concerted metabolism on the decolourization and the biodegradation efficiencies were studied. Results showed that there was an equilibrated ratio between the bioaugmented bacteria and the other microorganisms of the activated sludge. However, the best yields were observed for the combination 33% activated sludge, 33% Bacillus cereus and 33% Bacillus pumilus, with a colour and carbon oxygen demand (COD) removal of 98% and 99% respectively, obtained after 48 h of incubation. The high performance liquid chromatography (HPLC), Proton Nuclear Magnetic Resonance (1H NMR) analysis of the produced metabolites after the biodegradation of the dye by the bioaugmented consortium showed the presence of protons on an aromatic cycle 1,2-disubstituted and possessing an axial symmetry similar to the phthalate groups.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2012.692008