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Dilution rates of cattle slurry affect ammonia uptake and protein production of duckweed grown in recirculating systems

Stadtlander, Timo; Bandy, Jaclyn; Rosskothen, Dennis; Pietsch, Constanze; Tschudi, Fridolin; Sigrist, Mathias; Seitz, Andreas and Leiber, Florian (2022) Dilution rates of cattle slurry affect ammonia uptake and protein production of duckweed grown in recirculating systems. Journal of Cleaner Production, 357, pp. 1-8.

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Document available online at: https://www.sciencedirect.com/science/article/pii/S0959652622015268?via%3Dihub


Duckweed is a potential collector of nitrogen from animal liquid manure and a source of protein suitable as feed for livestock and fish. Therefore, it provides opportunities for circular economy systems. Two duckweed species, Spirodela polyrhiza and Landoltia punctata, were grown in five recirculating systems each connected to a reservoir tank filled with water and graded organic cattle slurry concentrations. Fresh and dry biomass, protein production and amino acid profiles among the nitrogen removal were evaluated. Spirodela polyrhiza showed a significantly higher fresh biomass production but L. punctata dry matter content was generally higher resulting in similar dry biomass production for both species This study shows clearly that the crude protein content, ranging between 29.3 and 37.9% of dry matter, was positively correlated to slurry and total ammonia nitrogen (TAN) concentration of the substrate, independent of the duckweed species. Total crude protein yield was in the range of 1.37–1.95 g/m2/d, following a quadratic function regarding slurry and TAN concentrations, with marginal differences between species. Biomass and crude protein yields were optimal for both duckweed species at a TAN concentration of 19 mg/l, which corresponded to a slurry dilution of 1:8. The results of this study provide important information for operation of recirculating duckweed production systems on slurry and operators should aim to keep TAN concentrations in that range for optimization of protein production in conjunction with TAN removal.

EPrint Type:Journal paper
Keywords:nitrogen content, protein plants, feeds, Lemna, duckweed, Abacus, FiBL50094
Agrovoc keywords:
Duckweed -> Lemna
animal feed -> feeds
protein plants
nitrogen content
Subjects: Animal husbandry > Feeding and growth
Food systems > Recycling, balancing and resource management
Environmental aspects > Air and water emissions
Animal husbandry > Production systems > Aquaculture
Research affiliation: Switzerland > ZHAW
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Aquaculture
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Animal nutrition > Protein supply
Deposited By: Stadtlander, Dr. Timo
ID Code:44142
Deposited On:08 Jun 2022 10:51
Last Modified:08 Jun 2022 10:51
Document Language:English
Refereed:Peer-reviewed and accepted

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