Pervaporation Process For Groundwater Decontamination

Section 20.12.6 discussed the application of a combined Sequencing Batch Reactor and Membrane Bioreactor (SBR-MBR) system to groundwater decontamination. Figure 14 shows the flow diagram of the pervaporation process (one of the membrane processes), which is a feasible process for removing VOCs from contaminated water. Permeable membranes that preferentially adsorb VOCs are used to partition VOCs from the contaminated water. The VOCs diffuse from the membrane-water interface through the membrane by vacuum. Upstream of the system's vacuum vent, a condenser traps and contains the permeating vapors, condensing the vapor to liquid while

Figure 14 Cross-flow pervaporation system for groundwater decontamination. (Courtesy of USEPA.)

alleviating fugitive emissions. The condensed organic materials represent only a fraction of the initial wastewater volume and may be subsequently disposed of at significant cost savings. The membrane modules consist of hollow fibers with well-defined alignment that results in high mass transfer efficiencies, minimal pressure drip, and low operating costs. The process is commercially available from Zenon Environmental Inc., Ontario, Canada.

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