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El estudio, publicado bajo el título “Revalorization of microalgae cultivation effluent: a circular strategy for long-term sustainable production of Tetraselmis striata”, valida a escala piloto una estrategia de economía circular para producir biomasa algal de forma más eficiente, con menor consumo de recursos y aplicaciones de alto valor para la acuicultura y otros sectores


El Instituto Tecnológico de Canarias, sociedad pública adscrita a la Consejería de Universidades, Ciencia e Innovación y Cultura del Gobierno de Canarias, a través de su departamento de Biotecnología y en colaboración con el Instituto de Oceanografía y Cambio Global (IOCAG) de la Universidad de Las Palmas de Gran Canaria (ULPGC) y la Universidad de La Laguna (ULL), ha liderado una investigación que redefine los estándares de sostenibilidad en la biotecnología marina.

El estudio, difundido internacionalmente a través de la revista científica Aquaculture y en numerosos congresos internacionales, cuenta con Begoña Bustamante como autora principal, junto a Monserrat Alemán, Marianna Venuleo, Eduardo Portillo y Flavio Guidi, del ITC. También firman el artículo Diana Resi y José A. Pérez, del Departamento de Biología Animal de la ULL, así como Juan Luis Gómez-Pinchetti, director científico del Banco Español de Algas, adscrito a la ULPGC.

Eficiencia de recursos y optimización energética

Este trabajo ha validado con éxito el uso de la microalga nativa Tetraselmis striata BEA 1978B a escala piloto en un entorno relevante, mediante la recirculación de la totalidad del medio de cultivo sin postratamiento durante periodos de hasta dos meses y diez ciclos de cultivo en régimen semicontinuo.

Los datos obtenidos durante los ensayos realizados en sistemas de cultivo tipo raceway de 10.000 litros (10 m3) demuestran que esta estrategia de economía circular permite reducir en un 84% el volumen de medio de cultivo utilizado en el cómputo anual, lo que se traduce en una disminución equivalente del vertido de efluentes al medio marino. Esta gestión eficiente conlleva además un ahorro anual del 51% en la energía necesaria para el bombeo de nueva agua de mar y de efluentes, en igualdad de superficie de cultivo, así como una reducción del 7,5% en los costes energéticos globales del proceso de cultivo, sin comprometer el crecimiento de la microalga frente al uso de medio de cultivo fresco y logrando una productividad anual de 43,7 toneladas de biomasa seca por hectárea.

Potencial biotecnológico y aplicaciones comerciales

La investigación profundiza en la calidad de la biomasa resultante, y confirma que el contenido de metales pesados y la carga microbiológica cumplen estrictamente con los estándares de seguridad de la Unión Europea para su uso en piensos e incluso en alimentación humana. El equipo científico ha demostrado que es posible modular la composición celular de la microalga en función de las aplicaciones industriales. Mediante una suplementación equilibrada de nutrientes en el medio de cultivo se obtiene una biomasa con un contenido proteico superior al 50% (54,3% en condiciones exteriores), ideal para el sector de los piensos acuícolas; mientras que, en condiciones de agotamiento de nutrientes, la microalga acumula carbohidratos, convirtiéndose en una fuente excelente para la producción de biocombustibles.

Colaboración institucional por el crecimiento azul

Este avance pone de relieve la colaboración estratégica entre centros de I+D+i y entidades académicas de Canarias para consolidar una posición destacada dentro de la investigación aplicada a la biotecnología azul y abrir nuevas posibilidades para el desarrollo de modelos de producción acuícola más sostenibles en el Archipiélago que ofrezcan soluciones tecnológicas a los retos de las zonas áridas y semiáridas. Al emplear una especie procedente de la zona costera del sureste de Gran Canaria, el proyecto no solo contribuye a la protección de la biodiversidad local, sino que también posiciona a Canarias como un laboratorio de referencia internacional en la optimización de procesos bioindustriales bajo un marco de sostenibilidad y máximo aprovechamiento de los recursos naturales. En conjunto, estos resultados allanan el camino para la implementación de un enfoque innovador, limpio y eficiente en el uso de los recursos en el sector acuícola de Canarias, dentro de un modelo de economía circular y gestión eficiente del agua.

 

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