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Dried Seaweed (Sargassum ilicifolium) as an Adsorbent for Phosphorous Removal from Aqueous Solutions
Mahmoud Hafezieh, Morteza Hosseini, Hamid Rezaii

Abstract
Aquaculture is a source of significant
amounts of wastes, which generally leads to
deterioration of water quality. Removal of
phosphorous (P) from aquaculture wastewater
is an important environmental challenge.
In the present study, efficacy of dry sea weed
(Sargassum ilicifolium) to remove water P was
investigated under laboratory conditions. Several
levels of medium pH (3.5-10), initial P
concentration (0.015-0.45mgl-1), contact time
(7-60min), particle size (0.5-5mm) and the sea
weed particle concentration (10-40gl-1) have
been monitored. The results showed a high efficiency
of the sea weed to remove water P under
different conditions (83.1-97.7% P removal).
Among the tested pH, 3.5 had the lowest
P removal. P removal linearly increased along
with time progress. The lowest P removal was
observed in the lowest initial P concentration
(0.015mg/l), however, there was no significant
difference among the groups with initial P concentration
of 0.15-0.45 mg/l. P removal in 10g/l
sea weed concentration was significantly lower
than those of 20 and 40g/l. P removal significantly
increased with decrease in sea weed particle
size. Regression analysis showed that the
weight of factors to remove P from the medium
was as follow: particle size (β = -0.659)> particle
concentration (β = 0.427)> time (β = 0.227)>
initial P concentration (β = 0.190)> medium pH
(β = 0.113). In conclusion, dry S. ilicifolium is
capable to efficiently remove P from wastewater
at aquaculture-relevant concentration. The
P removal capability of the seaweed markedly
increases by decrease in particle size and increase
in particle concentration in medium.
Keywords
Uptake, Phosphorus, Wastewater, Seaweed, Adsorption

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