REMOVAL OF VOCs FROM WASTEWATER WITH MEMBRANE EXTRACTION

摘要

Removal of VOCs with membrane extraction from waste-water has attracted many researchers. In this paper, Kerosene-Chloroform-Water is used as experimental system. In hydrophobic polypropylene hollow fibre module the mass transfer characteristics of membrane extraction process have been studied. The overall mass transfer coefficient based on aqueous phase K_w is calculated and the reasons for deviation between the experimental value and the calculated one have been studied. The results indicate that the resistance of mass transfer is mainly from the diffusion in aqueous phase, but the non-ideality of the shell-side is the major factor causing the deviation. By the calculation of HTU, the high performance of MHF is proved. It is also shown that MHF is highly efficient for removal of the COD value of chloroform solution.