By immobilizing the aqueous-organic interfaces in the pore-mouths of microporous hydrophobic hollow fiber membranes, solvent extraction can be carried out nondispersively with great efficiency. The performance of a compact hollow fiber module for extraction of a toxic heavy metal, Cu++, by a chelating extractant LIX84® in n-heptane is illustrated. Equally efficient extraction of multiple priority organic pollutants from a high strength waste stream is demonstrated. Employing this nondispersive extraction concept along with nondispersive gas absorption/stripping via microporous membranes, a novel membrane reactor for oxidative degradation of pollutants has been developed. Pollutants in an aqueous stream flowing through one set of hollow fibers are extracted into the shell-side of the reactor containing an inert fluorocarbon (FC) phase simultaneously saturated with O3 from a gas phase following through another set of hollow fibers. Ozonation of pollutants in the FC phase is highly efficient due to high O3 concentration and extraction of pollutants into the FC phase. Batch kinetic data for such two-phase ozonation are provided; continuous degradation of phenol in the novel reactor is demonstrated.
All Science Journal Classification (ASJC) codes
- Waste Management and Disposal