Journal article

Authors list: Schleyken, J.; Gumpert, F.; Traenckner, S.; Palm, H. W.; Traenckner, J.

Publication year: 2024

Pages: 3775-3788

Journal: International Journal of Environmental Science and Technology

Volume number: 21

Issue number: 4

ISSN: 1735-1472

eISSN: 1735-2630

Open access status: Hybrid

DOI Link: https://doi.org/10.1007/s13762-023-05226-8

Publisher: Springer

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 precipitation 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.

Harvard Citation style: Schleyken, J., Gumpert, F., Traenckner, S., Palm, H. and Traenckner, J. (2024) Enhanced chemical recovery of phosphorus from residues of recirculating aquaculture systems (RAS), International Journal of Environmental Science and Technology, 21(4), pp. 3775-3788. https://doi.org/10.1007/s13762-023-05226-8

APA Citation style: Schleyken, J., Gumpert, F., Traenckner, S., Palm, H., & Traenckner, J. (2024). Enhanced chemical recovery of phosphorus from residues of recirculating aquaculture systems (RAS). International Journal of Environmental Science and Technology. 21(4), 3775-3788. https://doi.org/10.1007/s13762-023-05226-8