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The use of duckweed for wastewater treatment.
1988
Zirschky J. | Reed S.C.
Wastewater valorisation in an integrated multitrophic aquaculture system; assessing nutrient removal and biomass production by duckweed species
2022
Paolacci, Simona | Stejskal, Vlastimil | Toner, Damien | Jansen, Marcel A.K.
The aquaculture industry is considered a key sector for the supply of high quality, nutritious food. However, growth of the aquaculture sector has been slow, particularly in Europe, and this is amongst others linked to concerns about environmental impacts of this industry. Integrated Multitrophic Aquaculture (IMTA) has been identified as an important technology to sustainably improve freshwater fish production. In IMTA, economically valuable extractive species feed on waste produced by other species, remediating wastewater, and minimising the environmental impact of aquaculture. This study presents quantitative information on the nitrogen and phosphorus removal efficiency of a duckweed-based, pilot, semi-commercial IMTA system. Duckweed species are free-floating freshwater species belonging to the family of Lemnaceae. The aim of this study was to test the potential of duckweed-based IMTA under realistic environmental conditions. Three different approaches were used to assess remediation capacity; 1) assessment of water quality pre and post treatment with duckweed showed that the system can remove 0.78 and 0.38 T y⁻¹ of Total Nitrogen (TN) and Total Phosphorus (TP), respectively 2) based on nitrogen and phosphorus content of newly grown duckweed biomass, it was shown that 1.71 and 0.22 T y⁻¹ of TN and TP can be removed, respectively 3) extrapolation based on laboratory established nitrogen and phosphorus uptake rates determined that 0.88 and 0.08 T y⁻¹ of TN and TP can be removed by the system. There is substantive agreement between the three assessments, and the study confirms that duckweed can maintain good quality water in an IMTA system, while yielding high protein content (21.84 ± 2.45%) biomass. The quantitative data on nitrogen and phosphorus removal inform the design of further IMTA systems, and especially create a scientific basis to determine the balance between aquaculture and extractive species.
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1993
Huebert, D.B. | Shay, J.M. (Department of Botany, University of Manitoba, Winnipeg, Manitoba (Canada))
Use of freshwater plants for phytotoxicity testing: a review
1995
Lewis, M.A. (US Environmental Protection Agency, 1 Sabine Island Drive, Environmental Research Laboratory, Gulf Breeze, Florida 32561 (USA))
Lemna minor membranes affected by adjuvants
1993
Caux, P.Y. | Weinberger, P. (Environment Canada, Eco-Health Branch, Ecosystems Sciences and Evaluations Directorate, Ottawa, Ont. K1A 0H3 (Canada))
Bioaccumulation of selenium by floating aquatic plants
1991
Ornes, W.H. (South Carolina Univ., Aiken, SC (USA). Dept. of Biology) | Sajwan, K.S. | Dosskey, M.G. | Adriano, D.C.
