title: Improvement of activated sludge resistance to shock loading by fungal enzyme addition during textile wastewater treatment.
abstract: The effects of the additions of the fungal enzymatic extract were investigated in relation to the treatment of real textile wastewater (RTW) by the activated sludge process (ASP). The used enzyme cocktail was produced by a new isolated fungal Chaetomium globosum IMA1. The system that was operated with enzyme addition showed a better chemical oxygen demand (COD) removal efficiency (95%) compared to the control system (75%). In addition, the improvement of color removal (OD620) efficiencies was around 15%, when the newly consortium fungal enzymes was added. As the organic loading rate (OLR) increased from 0.33 g to 0.66 g COD L-1d-1, a decrease in the performance of the two reactors was observed by monitoring the quality of treated effluents. However, the ASP working with enzyme addition showed a strong resistance to shock loadings and restored after few days compared to the control system, which was strongly inhibited. In fact, the enzyme addition improved the sludge volume index (SVI) and the activity of microorganisms. A high activity of laccase (300 U.L-1) enzyme was observed throughout the decolorization process in the improved system.
authors.affiliation: a Lab Eco Tech Micro, INSAT , Université de Carthage , Tunis , Tunisia.
authors.forename: Imène
authors.initials: I
authors.lastname: Manai
authors.affiliation: a Lab Eco Tech Micro, INSAT , Université de Carthage , Tunis , Tunisia.|b Laboratoire de Biologie Moléculaire, Ecole de Biologie Industrielle , Cergy , France.
authors.forename: Baligh
authors.initials: B
authors.lastname: Miladi
authors.affiliation: b Laboratoire de Biologie Moléculaire, Ecole de Biologie Industrielle , Cergy , France.
authors.forename: Abdellatif
authors.initials: A
authors.lastname: El Mselmi
authors.affiliation: a Lab Eco Tech Micro, INSAT , Université de Carthage , Tunis , Tunisia.
authors.forename: Moktar
authors.initials: M
authors.lastname: Hamdi
authors.affiliation: a Lab Eco Tech Micro, INSAT , Université de Carthage , Tunis , Tunisia.
authors.forename: Hassib
authors.initials: H
authors.lastname: Bouallagui
mesh_terms: D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D012722:Sewage / Q000382:microbiology*; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage
keywords: Dyes; activated sludge system; biodegradation; fungal enzymatic additions; real textile effluent