Valorization of greenhouse effluents with microalgae: Sustainable aquafeeds and biostimulants from drain water.
Program & Speaker Details
Every drop counts...
…in soilless crop production because the intensive use of fresh water and the release of nutrient-rich effluents (drain water) negatively impacts the environment. AlgaCycle will re-use these effluents to produce microalgae. The resulting microalgal biomass will be fractionated into water extracts and residual debris. These fractions will be used as biostimulants in agriculture or feeds in aquaculture.
AlgaCycle re-uses drain water
from soilless crop production
An area of ~1500 ha is used for greenhouses with soilless systems, producing mostly vegetables, ornamentals and more recently, berries. The growth of this sector is limited by water availability and the release of drainage water and solid residues (e.g. plastics and organic waste) becomes an environmental problem. Drain water is a valuable resource because it contains high contents of nitrates and phosphorus. However, nowadays drain waters are discharged unused and can cause eutrophication and rising nutrient levels in the ground waters used for human consumption. (…)
Soilless greenhouse productions in PT
More freshwater needed by 2050
Of the population face 50 mg/L nitrates in drinking-water
(…) The released drain water per hectare soilless crop production contains sufficient nutrients and freshwater to produce 2700 Kg of microalgal biomass per year. This biomass can be used to produce biostimulants for plants and sustainable feeds for aquaculture.
Algal biomass per year can be produced from 1 ha soilless production
Of algal biomass can be used in aquafeeds to substitute fish or soy-based ingredients
Three outputs from microalgae
Algae extracts are promising biostimulants for plants, enhancing growth and quality of fruits.
Algae biomass can replace substitute unsustainable soy and fish-based ingredients in feeds for fish.
By producing algae in drain water, nutrients are removed and clean fresh water remains and may be re-used.