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Kinetic studies of decolonisation of concentrates from nanofiltration treatment of real textile effluents in anaerobic/aerobic sequencing batch reactors

Klepacz-Smółka A., Paździor K., Ledakowicz S., Sójka-Ledakowicz J., Mrozińska Z., Żyłła R.

Environment Protection Engineering

2009

Vol. 35, nr 3

145-155

The aim of the research was to investigate the degradation of real textile wastewater concentrate obtained in the nanofiltration processes. An anaerobic/aerobic sequencing batch reactor system working in a 24-h cycle was applied. The anaerobic phase aimed at the reduction of Reactive Red 120 molecules was followed by the aerobic oxidation of aromatic amine (orthanilic acid) released from azo dye. Two different successive decolourisation periods were observed in the anaerobic bioreactor for two tested concentrates of textile wastewater. A first-order reaction model was used to describe the decolourisation process. Furthermore, the relation between COD reduction and the concentrate decolourisation was observed. The aromatic amine was completely degraded in the aerobic stage only in the case of two-fold-concentrated textile wastewater.