Iron rich glauconite sand as an efficient phosphate immobilising agent in river sediments

A - Papers appearing in refereed journals

xia, L., David, T., Verbeeck, M., Bruneel, Y. and Smolders, E. 2022. Iron rich glauconite sand as an efficient phosphate immobilising agent in river sediments. Science of the Total Environment. 811, p. 152483. https://doi.org/10.1016/j.scitotenv.2021.152483

Authorsxia, L., David, T., Verbeeck, M., Bruneel, Y. and Smolders, E.
Abstract

The reductive dissolution of iron (Fe) (oxy)hydroxides in sediments releases phosphorus (P) to the overlying water and
may lead to eutrophication. Glauconite sands (GS) are rich in Fe and may be used as readily available P sorbents. This
study was set up to test effects of dose and type of GS on the P immobilisation in sediments under hypoxic conditions.
Three different GS were amended to a P-rich river sediment at doses of 0% (control), 5% and 10% (weight fractions)
and incubated with overlying water in batch laboratory conditions. Glutamate was added to the solution after 15 days
to deplete any residual dissolved oxygen from the sediment-water interface. In the first 15 days, the P concentration in
the overlying water peaked to 1.5 mg P L−1 at day 9 in the control and decreased to 0.9 mg P L−1 at lowest Fe-dose and
to 0.03 mg P L−1 at the highest Fe-dose, the effects of GS type and dose were explained by the Fe dose. After 15 days,
the added glutamate induced a second, and larger peak of P in the overlying water in sediment, that peak was lower in
amended sediments but no GS dose or type related effects were found. This suggests that freshly precipitated P species
at the sediment-water interface can be remobilised. This study highlights the potential for using this natural mineral as a cheap and easily available sediment remediation material, but its longevity under rare extreme conditions needs to be further investigated.

KeywordsPhosphorus release; Iron rich glauconite sans; Amendment; Sediment-water interactions; eutrophication
Year of Publication2022
JournalScience of the Total Environment
Journal citation811, p. 152483
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2021.152483
Open accessPublished as non-open access
Output statusPublished
Publication dates
Online16 Dec 2021
Publication process dates
Accepted13 Dec 2021
ISSN0048-9697
PublisherElsevier Science Bv

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