Abstract: Materials and methods are provided for growing algae while maintaining culture selectivity. Algae that can be grown include, for example, green algae such as those of the genus Scenedesmus. Lipid obtained from the algae can be used to produce biofuels such as biodiesel or polyunsaturated fatty acids such as omega-3 fatty acids. Feedstocks such as animal feed and aquaculture feed can also be produced as can phytonutrients such as asataxanthin and beta-carotene.

Abstract: The present invention concerns a method for treating solid waste with an organic fraction. A slurry (4) of the waste (1) diluted with water (3) is sieved, at least by means of a sieving device (5) which lets pieces through whose dimension in at least one direction, and preferably in at least two standing directions, is situated between 2 and 20 mm, after which, from the slurry (7) which has passed through, a part of the ferrous metals (8) which are present in the waste (1) is removed from said waste by means of magnets, and the slurry (7) is finally dewatered.

Abstract: The present invention concerns a method for treating solid waste with an organic fraction. A slurry (4) of the waste (1) diluted with water (3) is sieved, at least by means of a sieving device (5) which lets pieces through whose dimension in at least one direction, and preferably in at least two standing directions, is situated between 2 and 20 mm, after which, from the slurry (7) which has passed through, a part of the ferrous metals (8) which are present in the waste (1) is removed from said waste by means of magnets, and the slurry (7) is finally dewatered.