The W2V project aims to bring to market a unique patent-pending eco-innovation bioprocess to utilize acid whey as a primary ingredient for microbial fermentation to produce sustainable high value products. The W2V technology converts the organic content of acid whey into feed-grade microbial biomass with high content of valuable vitamin B12, while the remaining water can be reused by the dairy factory or released into the water streams. The implementation of W2V technology will greatly reduce the environmental footprint, lower the production costs and increase competitiveness of dairy companies. Particularly, W2V technology will be highly relevant for European dairy industry, where most companies consist of small and medium sized dairy factories, which cannot afford costly processing facilities for disposal of acid whey. W2V project will generate an entirely new type of product for the EU and global markets: an organic vitamin B12-enriched microbial biomass, which can be used as very high quality animal feed, creating a perfect example of sustainable and economical circular zero-waste economy. W2V technology requires a low-cost processing facility, which can be installed on site of the dairy company. W2V technology is a game-changing solution for small-to-medium sized dairy companies and to the dairy industry in general. We expect rapid European and global market adoption of this unique disruptive technology demonstrating resource efficient circular economy.