The present invention provides a simple and effective microalgae cultivation method (under nitrogen limiting conditions) for subsequent use of this biomass as mono-substrate for a highly efficient and stable anaerobic fermen-tation in continuous long-term mode (Fig.1).
The continuous fermentation of algae bio-mass, generated under replete-N and low-N culture conditions, was performed under constant hydraulic retention time (HRT 20 days) and increasing organic loading rate. In contrast to conventional biomass (replete-N BM), the biogas as well as methane productivity of the low-N biomass (low-N BM) reactor was constantly high (see Fig. 2), with biomass to methane energy conversion efficiency of 84%, which is close to the theoretical maximum without any pretreatment.
The described technology enables the fast and competitive production of biogas in a continuous biotechnological process in industrial scale. On behalf of the University of Bielefeld, PROvendis offers access to rights for commercial use as well as the opportunity for further co-development.
- Effective production process of biogas through continuous fermentation of microalgae
- Efficient energy source
- New optimized cultivation procedure (low-N) for fertilizer cost reduction
- No pretreatment of biomass needed
- Methane content (61%) in biogas, higher than plant material
- Highly efficient fermentation to biogas / methane without inhibition risks
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Klassen V. et al. Efficiency and biotechnological aspects of biogas production from microalgal substrates. J. Biotechnol. 2016; Sep 20; 234:7-26. doi: 10.1016/j.jbiotec.2016.07.015