Oxidative treatment characteristics of refractory organic pollutants in textile-dyeing wastewater by ozonation with and without hydrogen peroxide

摘要

The textile-dyeing wastewater investigated in this study was taken from the effluent of a full-scale activated sludge process treating textile-dyeing wastewater from a textile company located in Gamagori City, Aichi, Japan. The wastewater plant consists of a preliminary treatment (screening, equalization and cooling) and activated sludge system followed by flocculation. The activated sludge process has two aeration reactors, aeration tanks A and B. The volumes of the aeration tanks (A and B) of this treatment process were 402 and 730 m~3, respectively. The average flow rate of the wastewater was 2000 m~3/d, with hydraulic retention time (HRT) of 48 hour.