pecífico de fraccionamiento e hidrólisis (Figura 5) se ha conseguido transformar dicha biomasa de Lemna en un biofertilizante líquido rico en aminoácidos (>0,8% aminoácidos p/p). Su efectividad como fertilizante podría incrementar los rendimientos de cultivos hortofrutícolas y forrajeros. LEMNA TOOL A partir de los resultados del proyecto se ha desarrollado una herramienta informática de libre acceso desde la página web del proyecto. Esta herramienta, denominada e-lemna tool, tiene como objetivo ayudar a las instalaciones ganaderas a realizar un estudio preliminar de viabilidad del cultivo de Lemna como sistema para la recuperación de nutrientes. e-lemna tool permite calcular ciertos indicadores de la viabilidad técnica (superficie requerida, producción anual de lemna), económica (CAPEX, OPEX, Cash-flow,..) y medioambiental (recuperaciones de N y P por hectárea y año) del sistema, teniendo en cuenta la zona climática en la que se ubicaría la instalación, diferentes escenarios de complejidad tecnológica del sistema de cultivo, así como diferentes alternativas de uso de la biomasa de lemna producida. Conclusiones Los resultados alcanzados hasta el momento demuestran que el cultivo tecnificado de Lemna está en línea con las directrices medioambientales y de aprovechamiento de recursos de Europa as an animal feed ingredient to replace soya and as a raw material for the production of liquid biofertilisers. First of all, the use of the fresh duckweed in pig feeds (for animals of 12-15kg) was evaluated, with very positive results in terms of acceptance and without associated physiological problems. Secondly, duckweed was used as a raw material for the production of bio-fertilisers. By means of a specific fractionation and hydrolysis process (Figure 5), it was possible to transform the duckweed biomass into a liquid bio-fertiliser rich in amino acids (>0.8% amino acids p/p). Its effectiveness as a fertiliser would enable increased horticultural and forage crop yields. LEMNA TOOL An open source software tool has been developed based on the project results and is available on the project website. This tool, called the e-lemna tool, has the objective of helping livestock facilities to carry out a preliminary feasibility study of duckweed as a nutrient recovery system. The e-lemna tool enables the calculation of technical feasibility indicators (surface area required, annual duckweed production), economic feasibility indicators (CAPEX, OPEX, Cash flow,..) and environmental feasibility indicators ( N and P recovery per hectare per annum) of the system, taking account of the climate where the system is to be installed, different technological complexity scenarios of the cultivation systems, as well as different usage alternatives for the duckweed produced. Conclusions The results achieved to date demonstrate that technicallyadvanced duckweed cultivation is in accordance with Europe 2020 guidelines on the environment and use of resources. Duckweed cultivation provides a solution to environmental problems caused by the excess of nutrients generated in areas with intensive livestock production, whilst also representing an alternative for the reduction of the environmental footprint associated with meat production chains. Figura 3. Pruebas de cultivo de lenteja de agua en los laboratorios de AINIA | Figure 3. Duckweed cultivation tests at the AINIA laboratories Figura 4. Esquema del prototipo del sistema de recuperación de nutrientes | Figure 4. Schematic diagram of nutrient recovery system prototype Gestión y tratamiento de residuos | Waste Management & Treatment FuturEnviro | Octubre October 2019 www.futurenviro.es 59
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