Nanofiltration system for water softening with internally staged spiral wound modules
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United States of America Patent
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Issued Date -
Nov 11, 2004
app pub date -
Mar 12, 2004
filing date -
Mar 14, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A spiral wound membrane filtration module is operated with a single pass through the feed side and without cross-flow on the permeate side. Recovery is 70% or more and feed side velocities are between 0.05 and 0.4 feet per second. The module may have dams in the spacer material on the shell/feed side to provide a feed path with multiple passes across the membrane leaves. A small-scale system for using such a module, for example to soften and filter water with a nanofiltration membrane, is described. The system includes a chemical cleaning apparatus and process.
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