STUDY ON THE TREATMENT OF DIRECT BLUE 86 IN WATER BY MEMBRANE BIOREACTOR

Abstract

The membrane bioreactor (MBR) technology has been widely applied to treat various industrial wastewater and has significant advantages over conventional activated sludge biological processes. In this study, the membrane bioreactor (MBR) is applied to treat Direct Blue 86 (DB86) dye. The reaction tank is designed with a useful volume of 36 liters (L*W*H = 30*30*50 cm) and utilizes submerged membrane modules with pore sizes equivalent to 0.3 µm. The experimental model of the MBR process is designed to include the decomposition of organic matter and biomass separation processes using membranes. Under the conditions of a temperature of 25 ± 5 °C, pH conditions ranging from 6.5 ÷ 7.5, dissolved oxygen (DO) concentration ranging from 4.0 ÷ 5.0 mg/L, and influent COD concentration of 375 ± 8 mg/L, the evaluation conditions include a sludge retention time of approximately 30 days, aeration/non-aeration cycle of 60 minutes/60 minutes, MLSS concentration of 6,000 – 7,000 mg/L, the COD removal efficiency exceeding 95%. Therefore, the membrane bioreactor (MBR) biological process technology can be applied in the research about the treatment of textile dyeing wastewater.