Mass Transport And Stability Of Supported Liquid Membrane

As a separation technology, supported liquid membranes offer many advantages. There are few studies on mass transfer mechanism. And although there are many reports on the stability of supported liquid membrane and the loss of membrane liquid, the key factors that affect the lifetime of the membranes are not quite clear just because of the limited research methods.In the present dissertation, the system of ammonia-nitrogen wastewater has been researched. The mechanism of ammonium (ammonia) transporting through the supported liquid membrane, which the membrane phase whether contains carrier or not, has been discussed. The factors affecting the permeability coefficient are investigated, and the mass transfer model across the supported liquid membrane is established, by which the mass transfer is simulated.(1)Partition coefficient, membrane phase conductance, and reversible reaction equilibrium constant when the membrane phase contains carrier are determined. Furthermore, the operation factors affecting these parameters are also investigated. (2)The permeation process in the flat-sheet supported liquid membrane under intermittent operation is investigated. The factors affecting the permeation coefficient which contain original feed solution concentration, stirring speed, the original pH of strip solution and the original pH of feed solution have been discussed when the membrane phase only contains membrane solvent. And the factors affecting the permeation coefficient which include original carrier concentration, the original pH of feed solution and membrane types have also been discussed when the membrane phase contains membrane solvent and carrier. Base on the double membrane theory, the model of the transport of NH3-N in membrane is established, and the parameters of the model...