MENDIOLA D1., Paredes L2., Akaboci T2., Llenas L2., Ponsa S2. 1Caviar Pirinea S.L.U., Yesa (Navarra), Spain. 2 BETA Technological Centre, Univ. of Vic-Central University of Catalonia, Spain. diego.mendiola@caviarpirinea.com lidia.paredes@uvic.cat INTRODUCTION The H2020 SEA2LAND project (2021-2024) aims to provide solutions to help overcome challenges related to food production, climate change and waste reuse. This project will meet this challenge by improving and adapting technologies for nutrient recovery to produce bio-based fertilisers (BBFs) and Tailor Made fertilisers (TMFs) from fishery and aquaculture by-products generated in Europe. Therefore, SEA2LAND will contribute to independence and secure the supply of nutrients to European agricultural systems and will promote the production of large-scale fertilizers (from non-imported raw materials), based on the circular economy model to transform by-products into nutrients for crops. Particularly, CAVIAR PIRINEA together with some research partners are mading available extended catalogue of animal by product, which are routinely sold to waste managing companies with no valorisation income derived. The technological approaches developed herein by BETA Technological Centre (BETA TC) are revealing that within a private aquaculture production scenario of 3.100Tn fish/year (i.e., rainbow trout (O. mykiss) and sturgeon (Arcipenser sp.)) and 1.902Tn of fresh processed products/year (i.e., fish, roe and caviar) => 69m3 fish sludge, 96Tn fish víscera and 200Tn of non-conforming fish/year could respectively be valuated through some of the current research techniques in progress. Likewise, the project could show that every increased productivity as derived from intensification in aquaculture and/or fish processing practices will not only lead to a subsequent huge, but also economically recoverable production of agro innovative byproducts. The solutions developed are expected to reduce the soil nutrient imbalance in Europe. MATERIAL & METHODS RESULTS AND DISCUSSION Acknowledgements: SEA2LAND project is a collaborative Innovation Action(IA) funded by the EU in the frame of the Horizon 2020 programme. The project is running from January 2021 to December 2024. Website: www.sea2landproject.eu Understanding the value of freshwater aquaculture and fish processing by-products through agroinnovative approach & technological solutions An innovative technological approach is being evaluated within some of the work packages for the valorization of aquaculture by-products (fish sludge and dead fishes). The SLUDGE is separated into solid and liquid fractions. Solid fraction valorization is conducted by applying biodrying processes, aiming to reduce the water content and obtain a nutrient-rich biodried product to be used as an organic amendment. The combustion of this product to recover phosphorus from the ashes to produce phosphoric acid is also expected. The feasibility of recovering the volatilized ammonia during the biodrying to produce ammonium salt is also under current evaluation within the project. The liquid fraction from sludge is being valorized by using several concentration processes. The method consists of an ultrafiltration (UF) system to separate solid particles present in the liquid fraction. The permeate produced by UF passes through the reverse osmosis (RO) system to concentrate the nutrients. The RO concentrate generated is subsequently processed in a Freeze Concentration (FC) unit, where the water is crystallized, and the nutrients are recovered in a nutrient-rich concentrate product. Moreover, a high-quality RO permeate with potential to be reused in the aquaculture industry facilities is also produced. Likewise, dead trout FISH FROM FARMING MORTALITY is used as co-substrate of the solid fraction in the bio-drying process. Figure 2: Technologies applied for the liquid fraction valorization. C. Fish Sludge from the processing plant. D. Dead fish as co-substrate. E. Mechanical pro