Anaerobic digestion & Thermal conversion
From Seaweed to Biogas will require a two-step approach. First we will digest the relatively easily to digest molecules using anaerobic bacteria. After that the remaining, more complex to digest hydrocarbons, will be fed into an anaerobic thermal convertor. This two-step approach is the most economical way to produce a maximum amount of natural gas from the Sargassum.
The remaining from the biomass digester will be put in a thermal convertor and heated without oxygen until the Sargassum disintegrates. The residual flows will be gas and ash. The first pilot plant of a thermal convertor is build and operational in the Netherlands where it successfully makes diesel and gas from plastics and CNG from biomass. This technology is available for testing with Sargassum.
With Maris’ experience we have state-of-the-art knowledge and know-how available to our consortium we expect that after the digester and thermal conversion steps a percentage of the input will remain as ash. Depending on the chemical composition of the ash it can be turned into valuable components such as activated carbon, fertilizer, bio coal or filler for building materials. Post-processing of ashes will focus on the cost-effective production of high value components and safe immobilization and deactivation of heavy metals and other hazardous components.
Maris Projects has ample experience with upgrading of ashes from other organic feedstocks. Sargassum is new and its ashes need to be thoroughly tested, but on the bases of our current knowledge we are confident that the ashes can be turned into valuable products and that this can generate additional benefits to the Caribbean islands.