Abstract
In this paper, an efficient method for phenol removal from wastewaters by a combination of UV degradation and rejection by a low-pressure reverse osmosis membrane system has been presented. The results showed that phenol removal by the UV/RO hybrid system is more efficient than by individual UV degradation or rejection by RO system. In order to compare the efficiencies of the individual and hybrid systems, a multipurpose experimental setup was assembled, and phenol removal by UV degradation and rejection by RO and UV/RO hybrid systems was examined. In degradation of phenol by UV system, phenol solutions with constant concentration and various pH values (3, 5, 7, and 9) were examined. The results showed that the highest degradation efficiency was obtained at pH = 5 using a single 6W UV system. The removal of phenol by the RO membrane at various pH (3, 5, and 7) at two different feed pressures (50, and 70 psi) and at different feed concentrations (35, 50, and 100 ppm) was examined. The removal efficiencies after 60 min for UV, RO, and UV/RO hybrid systems were obtained as 17, 20, and 58%, respectively. In addition, the results showed that an increase in feed concentration increases the removal efficiency of phenol in the UV/RO hybrid system, while the effect of pressure showed the presence of a critical pressure after which the removal is efficient. The critical pressure in the present study was obtained as 50 psi.
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