Aproveitamento de residuos agroforestais como fonte de biogas e compost

Abstract

In Galicia, forestland represents approximately 2/3 of the total area. Its high productivity provides significant amounts of phytomass, often unmarketable and capable of being valued. As they are predominantly materials with a high C proportion, their participation in composting was evaluated by adding pig slurry, acting as water and N vector, to boost the process. In addition, sludge resulting from the manufacture of medium density fiberboard (MDF) as a co-composting additive was integrated for the first time. Studies were extended with the evaluation of biomethane production from anaerobic sludge digestion and raw wastewater resulting from the MDF tableboard industry. The results obtained confirm its suitability to be transformed by the two techniques (composting and anaerobic digestion), underlining the factors to be taken into account to improve the efficiency of the processes. The research aimed to find synergies between different waste streams in the Galician agroforestry sector. The benefits achieved would be translated into a different management route to the direct application to the soil of liquid livestock dejections, the recovery of forest industry wastes and the reduction of forest phytomass in the Galician forestalnd in order to reduce the risk of wildfires.