Abstract
This study aims to evaluate the performance of membrane bioreactor (MBR) followed by the membrane of reverse osmosis (RO) for textile wastewater treatment and reuse. Firstly, study of the effect of hydraulic retention time (HRT) and the concentration of mixed liquid suspended solids (MLSS) on the removal efficiency of chemical oxygen demand, colour and turbidity were achieved by MBR system. The results showed that the MBR technology became increasingly effective in the treatment of textile wastewater with increasing HRT and MLSS concentrations The highest removal efficiencies were 86.7%, 77.67% and 96.74% for COD, colour and turbidity, respectively when HRT = 2days, while the highest removal efficiencies were 88.34%, 83.7% and 97.9% when HRT = 2.5days. The second step was studying the effect of operating pressure and RO feed temperature on the removal efficiency of COD and colour of the RO system. MBR effluent has been treated with RO membrane to remove the remaining pollutants. The results showed that, the increasing of the pressure and decreasing of the temperature have a positive effect on removal efficiency. The maximum removal efficiencies obtained for COD and colour were 99.3% and 99.8% respectively at a pressure of 10 bar and 25 °C RO feed temperature.
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