Treatment and reuse of printing and dyeing wastewater using BAF/DM technology

In the paper, the integrated wastewater reclamation system of the combined biological aerated filter (BAF) and dynamic membrane (DM) technology was feasible and effective for dyeing and printing wastewater treatment. The experiment was carried out continuously under of the optimal condition of hydraulic retention time (HRT) of 1.0 h, pH of 7.0-8.5, temperature of 25-30°C and an air/water volume flow ratio about 2:1 in the biological aerated filter reactor, and that dynamic membrane was run at an optimal of the operating pressure of 0.15MPa, and the cross-flow velocity of 1m/s. The results showed that the average concentration of COD, color and turbidity in the effluent were less than 50 mg/L, 15 times, 2NTU, respectively. The average COD, color, turbidity removal efficiencies were 90%, 91% and 90% respectively. The experimental results showed that showed that the integrated wastewater reclamation system is increasingly considered as a competitive method to printing and dyeing wastewater treatment.