A process for biomass production and photobioreactor for culturing phototrophic organisms or cells or mixotrophic

According to the proposed method for the production of biomass organisms or cells are cultured as a nutrient in a held in a photobioreactor in circulating suspension under the supply of light and at least CO For the cultivation of the suspension is applied via at least one spreading member in an upper portion of a culture chamber and delays their downward movement by at least one is arranged in the culture room interior element with a horizontally extending grid, screen or mesh structure. To this structure, the suspension is transferred into a plurality of drops. The drops through a drop cycle, delayed by the downward movement of the suspension, and a particularly intense exposure of the organisms or cells contained in the nutrient solution is ensured in the reactor introduced nutrients and light.