Evaluation on ecological stability and biodegradation of dyeing wastewater pre-treated by electron beam

Biological treatment of dyeing wastewater irradiated by electron beam has been performed in order to evaluate the biodegradation and the toxicity of effluent on ecological stability. Two samples, which one is irradiated dyeing wastewater and other is unirradiated dyeing wastewater were compared, respectively. Electron accelerator of 1 MeV, 40kW with the dose of 1.0 kGy was applied. Daphnia magna was cultivated to determine the toxicity. The biodegradability by irradiation was increased. The effectiveness of irradiation was remarkable when shorter HRT was applied to biological treatment process. The activity of microorganisms by irradiation was more active comparing with the biological treatment process without irradiation. The toxicity on the Daphnia magna of effluent was decreased from 2.49 to 2.16 when dyeing wastewater was pre-treated by electron beam irradiation. (author)