title: Combined anaerobic-ozonation process for treatment of textile wastewater: removal of acute toxicity and mutagenicity.
abstract: A novel set up composed of an anaerobic biofilm reactor followed by ozonation was used for treatment of artificial and real textile effluents containing azo dyes. The biological treatment efficiently removed chemical oxygen demand and color. Ozonation further reduced the organic content of the effluents and was very important for the degradation of aromatic compounds, as shown by the reduction of UV absorbance. The acute toxicity toward Vibrio fischeri and the shrimp Artemia salina increased after the biological treatment. No toxicity was detected after ozonation with the exception of the synthetic effluent containing the highest concentration, 1 g/l, of the azo dye Remazol Red. Both untreated and biologically treated textile effluents were found to have mutagenic effects. The mutagenicity increased even further after 1 min of ozonation. No mutagenicity was however detected in the effluents subjected to longer exposure to ozone. The results of this study suggest that the use of ozonation as short post-treatment after a biological process can be beneficial for the degradation of recalcitrant compounds and the removal of toxicity of textile wastewater. However, monitoring of toxicity and especially mutagenicity is crucial and should always be used to assess the success of a treatment strategy.
authors.affiliation: Department of Biotechnology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden. Electronic address: marisa.punzi@biotek.lu.se.
authors.forename: Marisa
authors.initials: M
authors.lastname: Punzi
authors.affiliation: Water and Environmental Engineering at the Department of Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Filip
authors.initials: F
authors.lastname: Nilsson
authors.affiliation: Department of Biotechnology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Anbarasan
authors.initials: A
authors.lastname: Anbalagan
authors.affiliation: School of Education and Environment, Kristianstad University, SE-291 88 Kristianstad, Sweden.
authors.forename: Britt-Marie
authors.initials: BM
authors.lastname: Svensson
authors.affiliation: Water and Environmental Engineering at the Department of Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Karin
authors.initials: K
authors.lastname: Jönsson
authors.affiliation: Department of Biotechnology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Bo
authors.initials: B
authors.lastname: Mattiasson
authors.affiliation: Department of Biotechnology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Jonstrup
mesh_terms: D000693:Anaerobiosis; D018441:Biofilms; D010126:Ozone / Q000737:chemistry*; D013783:Textile Industry; D062065:Wastewater; D014873:Water Pollutants / Q000633:toxicity*
chemical_list: D010126:Ozone; D062065:Wastewater; D014873:Water Pollutants
keywords: Azo dye; Biological treatment; Mutagenicity; Ozone; Textile wastewater