Study on treatment of wastewater containing nitrophenol compounds by liquid membrane process

The research on treatment of wastewater containing nitrophenols was carried out by liquid membrane process. The various parameters were selected for nitrophenols concentration 1050 mg/l in wastewater, such as the surfactant concentration in oil phase 2%, the NaOH concentration in the internal water phase 2%. the ratio of oil phase to internal water phase 2, the pH of external water phase 2 and the ratio of external water phase to emulsion phase 3. The results indicate that the total nitrophenols in influent can be reduced from 1050 to <1 mg/l and from 6700 to <2.2 mg/l via one-stage liquid membrane process. The removal rate of total nitrophenols in wastewater was >99.9%, and the nitrobenzene and COD, in wastewater were treated at same time also. (C) 2003 Published by Elsevier B.V.