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首页> 美国政府科技报告 >Novel Membrane and Device for Direct Contact Membrane Distillation-Based Desalination Process: Phase III. Desalination and Water Purification Research and Development Program Report No. 99
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Novel Membrane and Device for Direct Contact Membrane Distillation-Based Desalination Process: Phase III. Desalination and Water Purification Research and Development Program Report No. 99

机译：用于直接接触膜蒸馏的脱盐工艺的新型膜和装置：第三阶段。海水淡化和净水研究与开发计划第99号报告

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摘要

Phase III project on novel membrane and device for direct membrane distillation (DCMD) based desalination scaled up the hollow-fiber membrane surface area in the module successfully studied in Phase II by more than an order of magnitude to 0.29 m2 using 1088 hollow fibers having a plasma-polymerized coating recipe somewhat similar to that in Phase II module MXFR No. 3. The packing fraction of 25.4-cm long fibers was 0.22. Brine feed temperature ranged between 40 and 94 degrees C; a high water vapor flux of 60 kg/m2.h was achieved at 90 degrees C in module S/N 1004 at reasonable brine cross flow velocities (Reynolds number, Re, 78). Since Re values were similar to those in much smaller Phase II modules, module/process scale-up was successful. An extended-term 128 hour-long DCMD test using 87-90 degree C brine prefiltrated with 1 micron microfiltration unit yielded a steady flux of 54 kg/m2.h; the flux decayed only 6% from the initial value. Modules S/N 1004 and S/N 1005 were stacked back-to-back to demonstrate further scale-up. Studies using 3%, 6%, and 10% brines indicated limited flux drop suggesting DCMD for brine concentrate volume reduction. Estimated cost of water by DCMD was much less than that by reverse osmosis.

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