Ma. Nanny et al., AQUATIC SOLUBLE UNREACTIVE PHOSPHORUS - CONCENTRATION BY ULTRAFILTRATION AND REVERSE-OSMOSIS MEMBRANES, Water research, 28(6), 1994, pp. 1355-1365
Ultrafiltration (UF) and reverse osmosis (RO) membranes were used to c
oncrete and molecular size fractionate soluble unreactive phosphorus (
SUP) present in lake water. Qualitative behavior of the UF and RO memb
ranes with SUP was examined using the model SUP compounds: highly poly
merized DNA, degraded DNA, inositol hexaphosphate and orthophosphate.
To concentrate and molecular size fractionate SUP in lake water, UF an
d RO membranes were placed in series and the larger pore sized membran
e preceding the smaller pore sized membrane. Six different membrane se
quence configurations were examined. The percent SUP recovery of twent
y lake water samples collected over a year ranged from 16 to 100%. The
present SUP recovery was examined as a function of the membrane seque
nce used, volume concentration factor, the initial SUP concentration w
as the only major factor for SUP recovery. Calculated permeation facto
rs for each sample illustrate that seasonal changes in the SUP composi
tion may be occurring.