Abstract
The extraction and recovery of phenol from high concentration coal gasification wastewater has been investigated using polypropylene (PP) hollow fiber membranes and polyvinylidene fluoride (PVDF) hollow fiber membranes as supported liquid membrane and the mixture of extraction agent and paraffin as liquid membrane phase, with sodium hydroxide as stripping agent. The effect of the composition of the liquid membrane phase made of N-503-kerosene, tributyl phosphate (TBP)-kerosene or trialkyl phosphine oxide (TRPO)-kerosene on extraction efficiency has been studied. The supported liquid membrane give novel extraction result for the extraction of phenol from high concentration coal gasification wastewater when proper liquid membrane phases and liquid membrane support body materials are used in supported liquid membrane system. Under the operating conditions of waste water temperature at 20 ˚C pH at 8.4, waste water and stripping phase flow rate at 5 L/h, the supported liquid membrane using PP as supported liquid membrane and the extraction agent of TBP with volume proportion of 20% could operate continuously and stablely more than 24 hours and the extraction efficiency be 4% higher than that of PVDF-TBP supported liquid membrane systems.
Highlights
Hollow fiber supported liquid membranes, with large mass transfer area per unit volume and good stability, is used to investigate the extraction and recovery of phenol from high concentration coal gasification wastewater, which mainly contains the membrane support body, membrane solvent and mobile carrier
Liquid drain is the main reason of unstable operation [4] of supported liquid membrane system, but suitable support material can reduce the drain of the membrane phase in the operation, so continuous experiments on polyvinylidene fluoride (PVDF) membrane module and membrane PP module examining were carried out to determine the nature of the two kind materials in the continuous operation
The support liquid membrane system with PP membrane modules and the kerosene-tributyl phosphate (TBP) liquid membrane phase can steadily run for 24 hours
Summary
Hollow fiber supported liquid membranes, with large mass transfer area per unit volume and good stability, is used to investigate the extraction and recovery of phenol from high concentration coal gasification wastewater, which mainly contains the membrane support body, membrane solvent and mobile carrier (extractant). The membrane support bodies as well as the composition of the liquid membrane phase have an important effect on the mass transfer efficiency and continuous and stable operation of the supported liquid membrane [1, 2]. The relationship between the membrane support body and the composition of liquid membrane phase with the extraction efficiency and stable operation of supported liquid membrane system is experimentally studied for wastewater containing phenols from one coal gasification plant
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