Abstract
Lignosulphonates are known as biologically-difficult-to-degrade, multi-purpose macromolecules that potentially may create toxicity problems in biological activated sludge treatment systems and/or in receiving water bodies. In the present experimental work a commercial lignosulfonate formulation (COD = 320 mg/g; BOD5 = 8 mg/g) frequently being used as an auxiliarly chemical in the cotton and polyester dyeing process was subjected to ozonation (≈ 3 g O3/CODo) at different pH (6 and 12) and ozone doses (1,400 and 5,300 mg/h) to improve its biodegradability and reduce its toxicity. Experimental findings have indicated that ozonation of lignosulphonates is a rather kinetically limited process. 20 min ozonation of lignosulfonate at a dose of 1,400 mg/h and an initial pH of 12 resulted in an 8-fold decrease in acute toxicity (EC50 = 3−4% v/v) towards the micralgae Phaedactylum tricornutum) and 50% reduction in its inert COD content (CODo = 600 mg/L). COD-based molecular size distribution indicated that the lignosulphonate formulation was cleaved to low-molecular-weight COD fractions after ozonation under the above mentioned conditions.
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Acknowledgments
This study was financially supported by TUBITAK (The Turkish Scientific and Technical Research Council) under project Nr. ICTAG−C−075 for our participation in EU COST Action 628 (Eco-efficiency and BAT for Textile Dyeing and Finishing Processes) and TUBA (Turkish Scientific Academy).
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Babuna, F.G., Oructut, N., Arslan-Alaton, I., Iskender, G., Okay, O. (2010). Reducing the Toxicity and Recalcitrance of a Textile Xenobiotic Through Ozonation. In: Gökçekus, H., Türker, U., LaMoreaux, J. (eds) Survival and Sustainability. Environmental Earth Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-95991-5_90
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