Conentrating Of Phosphate With Simultaneous Removal Of Sodium Chloride Via Nanofiltration
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Date
2021-01-01
Authors
Vengedesweren, Durgashene
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Recovery of phosphorus has been gaining importance due to its natural scarcity and
high economical value. Aquaculture and poultry effluent with significant phosphate
content required further treatment before discharging to the environment. However,
its trace quantity makes the whole process not feasible. Moreover, the presence of salt
(NaCl) makes the effort to recover the phosphate as fertilizer less attractive due to its
unwanted salinity. In this study. nanofiltration had been tested to recover/concentrate
the phosphate ions and at the same time removing the sodium chloride. The study was
conducted using Desal DK5 membrane in dead-end mode using Dead End Stirred Cell
at different pressures and concentration to investigate the effect of transmembrane
pressure (TMP) and feed concentration on the rejection of phosphate ions, average
permeate flux and concentrating factor. The highest phosphate ion rejection, 99.86%,
was achieved at the lowest pressure, 2 bar, and lowest concentration of potassium
dihydrogen phosphate solution (20 ppm). However, in the same parameter, the
permeate flux and the concentrating factor (CF) obtained were the lowest compared to
other sets of experiment which are 20.15 L/m2.h and 1.55 respectively. The maximum
CF of could be achieved at 6 bar. The removal of NaCl increases with pressure,
however the presence of NaCl further reduce the phosphate ion rejection, lowering the
average permeate flux and concentrating factor. The results obtained is very
promising in terms of harvesting the nutrient from aquaculture effluent and at the
same time removing the unwanted salinity.