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Financed by the Interreg VI-A Italy-Slovenia 2021-2027 programme, the CIRCULAR RAINBOW project aimed at improving the sustainability and resilience of traditional trout farming through the use of RAS (Recirculating Aquaculture System<\/em>) plants for a responsible use of water resources and the development of a Digital Twin for management efficiency considering techno-economic aspects and identifying new value chains for sludge valorisation in a circularity approach.<\/p>\n The CIRCULAR RAINBOW project, through the use of RAS, optimised the management of surface water, which is a limited and increasingly contested resource among various agro-livestock sectors. The recovery of wastewater and sludge produced in RAS systems also made it possible to obtain fermentable organic material that was valorised in anaerobic digestion systems for biogas production.<\/p>\n The project also proposed an innovative use of the sludge from the RAS systems as co-substrates for new production models, using insect larvae (Hermetia illucens) for their bio-conversion into new biomasses, useful for other agro-industrial supply chains.<\/p>\n CIRCULAR RAINBOW aimed to promote the transition of trout farming towards circular models<\/strong> through actions to:<\/p>\n As a whole, the CIRCULAR RAINBOW project contributed to increase and demonstrate the feasibility of a transition of the programme area towards new generation agro-livestock practices, contributing to the development of a circular economy in a material flow that is an integral part of the blue economy.<\/p>\n The project was implemented by a transnational partnership<\/strong> composed of:<\/p>\n\n