TM 5-813-8
Figure 7-3. Reverse osmosis desalination system.
chemical stability, these membranes cannot tolerate any
Most cellulose acetate membranes can be used with
residual oxidant. If chlorination is required to reduce the
feed waters containing less than 1 milligram per liter of
amount of biological suspended solids, then
residual chlorine, which will protect the membranes from
dechlorination must be complete if polyaromatic amide
biological attack.
membranes are used.
(2) Polyaromatic amides. These membranes
are stable, biologically and chemically. Despite this
7-5
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