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The study of effective parameters in the decolorization of a dyeing industry wastewater using the sequential anaerobic-aerobic biological process

In the present study, some effective parameters in the sequential anaerobic-aerobic decoulrisation of a dyeing industry wastewater by adapted activated sludge was studied. The adaptation of the activated sludge was carried out by initially exposing it to 90% diluted wastewater and then gradually decreasing the dilution factor during a period of 90 days. The results of the experiments showed that neutralisation of the wastewater and addition of 2 g L -1 glucose did not improve the anaerobic decolourisation efficiency whereas increase in MLSS and dilution of the wastewater enhanced it. The anaerobic-aerobic process employing 4 days anaerobic period yielded around 84% decolourisation efficiency for the treatment of a dyeing wastewater.