REWARM
Renewable Energy from Waste Algae Recovery of Mediterranean sea
Financing: PRIN PNRR
Period: November 2023 – November 2025
Total project budget: € 223.686,00
Total budget CNR IIA: € 42.450,00
Scientific manager: Ettore Guerriero

Abstract of the project

A carbon-free global economy is difficult to achieve, but biomass represents a valuable renewable resource for reducing greenhouse gas emissions.
Residual biomass raw materials are widely available in the world and represent an effective way to recover energy and produce biofuels and biomaterials, avoiding competition with the food sector. In addition to residual biomass from the agri-food industry, algae and marine biomass are among the most promising resources.

The project aims to study the use of mixtures of residual biomass as fuel for heating and electrical systems powered by renewable sources. The activities take into consideration the technology and feasibility of feeding the combustors with mixtures containing marine residual biomass, whether algae or residues of underwater meadows that accumulate in excess on the coasts.

The proposed research project is aimed at the co-combustion of residual marine raw materials with residual agricultural biomass. On the one hand, spent mushroom compost (Spent Mushroom Compost - SMC) is a biomass derived from agriculture that is very difficult to burn due to its high moisture content. On the other hand, co-firing SMC with residual marine feedstocks would produce interesting interactions, which deserve to be studied. Therefore, SMC has been adopted as the reference biomass in research activities and is considered the fundamental component for preparing and studying biomass mixtures, composed of marine biomass (algae or seagrass) and SMC. Research activities cover all relevant topics to improve specific knowledge and strengthen the scientific community on the combined use of marine and agricultural residual biomass. The investigation is articulated through analysis of biomass mixtures, modeling activities and experimental campaigns on a full-scale fluidized bed combustor, providing insights and technological advances on FBC systems, on the opportunities of biomass mixtures and on the control of polluting species.
In particular, during combustion tests, the institute will take care of sampling and analyzing macropollutants and possible precursors of micropollutants, such as chlorinated organic compounds, possibly emitted by biomass rich in sodium chloride. The emission factors will be determined taking into account the fuel mixtures and the main parameters of the combustion system.
In order to define the efficiency of the abatement systems, sampling will be carried out upstream and downstream of the systems.
The objective is to introduce the use of marine biomass by mixing them with residual biomass from agriculture and the food industry, with an approach to the investigation that considers the chain of main processes, including the collection phase on the coasts/ beaches, preparation, chemical and physical characterization, combustion, stack emissions, ash production and the possibilities of their further use.
CNR-IIA
University of Rome 3

Ettore Guerriero
Francesca Vichi