Removal Of Phenol From Synthetic Waste Water Using Micellar-Enhanced Ultrafiltration With Quaternary Ammonium Salt Cationic Gemini Surfactants

Micellar-enhanced ultrafiltration, a surfactant-based separation process, is promising for the treatment of low concentration organic wastewater.Gemini surfactant becomes the focus of the field of MEUF increasingly due to its excellent performance in MEUF. In order to investigate factors such as material ratio, water environment and operating pressure for the effect of MEUF process and the performance of different hydrophobic chain length of CG.We select new type quaternary ammonium salt Gemini surfactants of CG12,CG14 and CG16,and conduct flat ultrafiltration experiments, and studied the influence of various experimental factors on ultrafiltration process systematicly considered phenol rejection, CG rejection,and permeate flux as investigation targets. We also builded the mathematical models through the BBD response surface experiment design to delves into the collaborative interaction between key factors on the response values,which is phenol rejection and permeate flux.First of all, we drew the conductivity-CG concentration curves, to make sure the CMC values of CG12,CG14 and CG16. And then,this study analyzed the influence of factors,include CG concentration,phenol concentration,electrolyte concentration and operating pressure,on the investigation targets which include phenol and CG rejection,and permeation flux.Finally, conducted the experimental scheme designed by Box - Behnken Design, and built the quadratic regression model according to the experimental data, and verify the rationality of the model.Results of optimal condition of experiment obtained by the model are close to that of actual verification tests.The results of this study show that hydrophobic chain length of Gemini surfactants have significant effect on its CMC value and the MEUF process. The longer the hydrophobic chain length, the higher phenol rejection, but the lower permeation flux. The reciprocal actions between the experimental factors have a significant influence on the experimental result indirectly. In addition, according to the model obtained,we get the optimal experimental conditions,which is that CG12 concentration is 10CMC,phenol concentration is 1mM, NaCl concentration is 25mM,and the corresponding optimal phenol rejection is 91.16%,the optimal permeate flux is 29.33 L/m2.h.