| Nitrophenol compounds are a group of important controlled pollutants. In the production of nitrophenol, nitrochlorobenzene, dyestuff and pesticide, nitrophenol-containing wastewater is discharged. The wastewater should be treated to meet the discharge standards set by the state or local government, then is allowed to discharge into environment. At present, the processes widely used for treatment of nitrophenol-containing wastewater include solvent extraction, adsorption with activated carbon or adsorption resin, chemical oxidation and biological oxidation, etc. But all these processes commonly cause high cost of treating wastewater and are hard to control. So firstly we conducted the study on the treatment of the formulated wastewater containing nitrophenol compounds by liquid membrane process. From the experiment results, we can see that the liquid membrane process was effective for removal of nitrophenols in wastewater under suitable conditions. It is also a special process which combines extraction and back extraction. The concentration of nitrophenols in wastewater could be reduced from l000mg/L to less than 1mg/L. But because the formulated wastewater only contains nitrophenols without any other interference compounds which exist in the real wastewater, so we continued the research on treatment of the real wastewater generated from the production site by liquid membrane process in order to verify the experiment results obtained with the formulated wastewater. In addition, the emulsion breaking process-a key element for liquid membrane process and the reuse of the oil phase recovered by emulsion breaking have been also explored in the present study. The experiment results show that Liquid membrane process used in the experiment is a new separation technology in chemical engineering with advantages of high rate, good efficiency and energy-saving. And after treating, the concentration of nitrophenols in wastewater could be reduced from l000mg/L to less than 1 mg/L.
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