Enhanced chemical recovery of phosphorus from residues of recirculating aquaculture systems (RAS)

Autor: Schleyken, J; Gumpert, F; Tränckner, S; Palm, HW; Tränckner, J
In:

International Journal of Environmental Science and Technology

Bandangabe: 21
Auflage: 21
Gesamttitelundnr1: Enhanced chemical recovery of phosphorus from residues of recirculating aquaculture systems (RAS)
ISBN: 1735-2630 & 1735-1472
DOI: https://doi.org/10.1007/s13762-023-05226-8
Seite: 3775 - 3788
Jahr: 2024

Einordung:
Institut: Professur Aquakultur und Sea-Ranching

Abstract:
In recirculating aquaculture systems, cultivated fish cannot incorporate all the phosphate contained in the feed. Excess
phosphate ends up in the culture water and in the sludge produced. If the sludge cannot be valorised directly in agriculture,
a chemical recovery as concentrated phosphate is an interesting option to help closing the phosphorus cycle. This study
investigates the extent to which accumulated phosphorus can be recovered by acid re-dissolution with subsequent precipita
tion on sludge from two different recirculating aquaculture systems cultivating African Catfish (Clarias gariepinus). Acid
treatment could increase the ratio of dissolved phosphorus available for subsequent precipitation by 53% for extensive and
by 61% for intensive fish farming. With the consecutive precipitation in total up to 86% of the phosphorus from the sludge
could be recovered. Phosphorus re-dissolution with citric acid requires the highest amount of acid per g dry matter as well
as of sodium hydroxide for subsequent precipitation. Sulfuric and nitric acids have comparably lower demands.

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