In Baltic Sea pilot, bokashi fermentation technology has proven to be a safe and economically viable method recycling fish waste in local communities and vermicomposting has proven to be an effective and economically viable method for after-treatment of fermented fish waste.

There are five main steps in producing the biobased fertilizers through bokashi fermentation and vermicomposting technologies. The aim is to replace conventionally used regular composting, thus reducing the GHG emissions and providing products with more active microbiology that enhance the soil biology. The procedure begins with side stream preparation and impurities removal; followed by fermentation, mixing of the organic mass and liquid separation; followed by granulation and drying or vermicomposting and sieving. The main output products are bokashi granules which qualify under the Regulation (EU) 2019/1009 as organic fertilizer; foliar spray which is a potential biostimulant and vermicompost which can be marketed as soil improver/growing medium.

Figure 1 : Mixing unit

Figure 2: Granulation unit