Investigation On The Reaction Of Phenolic Pollutions To Mono-rhamnolipid Micelles Using MEUF

Micellar-enhanced ultrafiltration is a technique combining surfactant with ultrafiltration, which ultilizes the micellization and the solubilization of surfactant to remove pollutions. MEUF has been developed for over thirty years, the technology is of high removal rate of pollutants, low energy consumption of equipment, easily operation and low cost, while traditional chemical surfactants can cause secondary pollution. In this work, hollow fiber polysulfone membrane is used to treat relatively lower concentration of phenolic pillutions in waste water. According to the hydrophobic, three different phenolic compounds have been selected as target pollutions in this study. Bio-surfactant rhamnolipid, such an environmental-friendly surfactant, is choosen as the frist time to remove phenolic pollutions by MEUF. It includes two aspects, first, ultrafiltration membrane adsorption and desorption of phenol;second, MEUF of three phenolic pollutions with rhamnolipid.Results showed that: 1, Membrane adsorption of phenol was increased with the volume of phenol feed solution rising from 1 L to 5 L, when the phenol concentration was fixed at 1m M. It was indicated the polysulfone ultrafiltration membrane was very easy to adsorp phenolic pollutions. When the feed volume was 5 L, adsorption capacity of membrane was exceeded 200 mg, which accounted for nearly 50% to 60% of the total amount phenol in feed solution. As desorption time increases, the curve of ultrafiltration membrane desorption concentration was fitting power function(Y=a Xb). Conrast to control sample, the membrane adsorption of phenol was reduced about 0.4 mol with the addition of rhamnolipid at 10 CMC(0.75 m M). 2, Three phenolic compounds in the retentate concentration ranked in order: resorcinol> phenol> 1-Naphthol with p H increase, while the permeate concentration increased slowly and ranked in a completely opposite order. Similar situation occurred in the study of phenolic pollution and rhamnolipid concentrations. Compared to the control adsorption, the desorption of 1-naphthol increased to 0.5 mol, that of resorcinol also reached the 0.34 mol in the study of MEUF with rhamnolipid. 3, The magnitude of zeta potential with the feed stream was lower than that of retentate stream. The gap of zeta potential was very small among three phenolic compounds. It is indicated that phenolic compounds had no effect on characteristics of rhamnolipid micelles in the feed solution and retentate solution. However, the micelles could be overshaped with each other at the operating pressure of 0.1 MPa.