This study describes the successful recovery of 2,4-dichlorophenol (DCP) from wastewater using the Membrane Aromatic Recovery System (MARS). In the MARS process a non-porous membrane separates a wastewater stream and a stripping solution. DCP is extracted from the wastewater and concentrated in its ionic form in the stripping solution, with pH pK a DCP. The MARS extraction stage was operated in batch mode with the stripping solution placed inside, and the wastewater stream outside, the membrane tubes. Advantages of this configuration are avoidance of membrane blockage, reduction of stripping solution volume and operational flexibility. The stability and mass-transfer characteristics of two different membrane materials, poly(dimethylsiloxane) (PDMS) and ethylene-propylene diene terpolymer (EPDM), were tested in DCP solutions with different acidities in order to simulate real industrial waste streams. EPDM exhibits one order of magnitude lower mass-transfer rates than PDMS (1.4 × 10 −7 m s
This study reports the stabilization of supported liquid membranes, through cross-linking the liquid membrane phase by using γ-radiation, and the performance of the resulting membranes under Membrane Aromatic Recovery System (MARS) operating conditions. The membranes were prepared by impregnating polypropylene glycol (PPG) into the pores of microporous flat sheet membranes [polyvinylidene fluoride (PVDF) or polypropylene (PP)] and subsequently exposing them to γ-radiation. The membranes prepared exhibited operational stability when investigated under MARS operating conditions for more than 1 month. The PP (0.05 mm) membrane provided the best combination of high phenol mass transfer rates and low water flux for the MARS process among the membranes tested in this study. The phenol mass transfer rate through this membrane (27 × 10 -7 m s -1 ) was 18 times higher than that of silicone rubber tubing (1.5 × 10 -7 m s -1 ). This study also reports the effect of radiation dose on the mass transfer rates and on the membrane support itself.
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