Development of CTA High Flux Low Operating Pressure R.O. Modules.

摘要

High flux cellulose triacetate hollow fibers were developed for desalting brackish water at low operating pressure. Multi-filament yarns containing uniform hollow fibers in the size range 180microns to 250microns O.D. and 60microns to 90microns I.D. were produced at spinning speeds in the range 50to 100feet per minute. Fibers having a flux of 3.0 GFD and a sodium chloride rejection of 85% at 150psi on 2000ppm NaCl feed were also produced. The desirability of using standard PVC pipe for low pressure R.O. module cases was explored. A 30,000 GPD module design was made on the basis of test results. The module contains two cartridges within 14-1/2inch diameter,filament wound,fiber glass reinforced plastic case. The flow mode through the two cartridges is radial double pass,the saline water flowing transversely outwardly across the fibers of one cartridge and inwardly across the fibers of the other. Productivity was rated on the basis of one year's compaction. A rejection of 85% is guaranteed when the module is operated at 50% water recovery from feed containing 2000ppm NaCl.