Effect Of Surfactants On The Retentiom Of Phenolic Compounds Durng Ultrafiltration

The phenolic compounds in the water body have posed great harm to the aquatic ecological environment and human health. As a surfactant based ultrafiltration technology, micellar-enhanced ultrafiltration(MEUF) has the ability on the treatment of phenolic wastewater effectively. Compared with the traditional water treatment technology, micellar-enhanced ultrafiltration has its own advantages such as high removal efficiency, low energy consumption, simple operation, high recovery efficiency and low cost.Micellar-enhanced ultrafiltration(MEUF) was applied to the separation of phenolic compounds, which included p-nitrophenol(PNP), p-chlorophenol(PCP), p-cresol(PC) and phenol(P) from the effluents. Cationic cetylpyridinium chloride(CPC), nonionic TX-100 and anionic sodium dodecyl benzene sulfonate(SDBS) were chosen as the surfactants. Several important parameters, including the separation efficiency, the distribution coefficient of phenolic compounds and the removal ratio of surfactants were investigated. It was shown that the separation efficiency, the distribution coefficient of phenolic compounds ascended with the increasing surfactant concentration and could be arranged as the following order: PNP > PCP > PC > P. Moreover, in the case of phenolic compound separation, CPC achieved the highest treatment efficiency, and the separation efficiency of SDBS is a little lower than that of TX-100. The removal ratios of the same surfactant when treating different phenolic effluents were nearly similar. However, when treating the same phenolic compound, the sequence of the surfactant rejection was in the following order: TX-100 > CPC > SDBS. This study has shown that it's feasible to introduce the MEUF technology for the treatment of phenolic wastewater, and the cationic surfactant achieves the best phenolic removal efficiency.The study compares the phenolic removal efficiency of three kinds of surfactants, and elucidate the governing mechanisms between surfactants and phenolic compounds when treating phenolic effluents and concentrating phenolic compounds via MEUF.