The general aim of this project is to develop a pilot-scale system for the valorization of fish-canning industry wastewaters. These effluents have been chosen because the marine-product processing industry is one of the most important industrial sectors in Galicia, representing the 10.1% of total world production. In the developed system, the organic matter present in the wastewater will be used to obtain added-value products such as polyhydroxyalkanoates (PHAs), a kind of biopolymers known also as bioplastics, whose properties will be studied. At the same time this process is proposed as an alternative to the wastewater treatment systems, in operation in these industries, which present limited removal efficiencies, characterized by its lower environmental impact. The global system at pilot-scale will comprise one acidifying reactor, a second enrichment unit to select PHA-accumulating microorganisms and a third unit where the maximization of the PHA accumulation by means of the previously enriched mixed culture will be performed. The operation of this system will be completed with the integration of a nitrogen removal unit to guarantee the reduction of the eutrophication potential of the final produced effluent. The Life Cycle Assessment (LCA) will allow the determination of the reduction of this potential together with other, like the impact on the climate change.