Optimal Biogas Generation from Algae - Method for a biotechnological production of biogas via bacterial fermentation of low-protein microalgae biomass
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 fermentation in continuous long-term mode. 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, with biomass to methane energy conversion efficiency of 84%, which is close to the theoretical maximum without any pretreatment.
The production of Biogas from algae biomass has been of interest for quite a long time. Microalgae is an interesting biosystem as it is really fast growing and has a high biomass productivity which is about ten times higher than conventional agriculture crops.
Until today, several obstacles like inefficient degradation and low C/N ratio limit the applicability of algae biomass for a large scale biogas production process.
The present invention overcomes most of the technical and biological difficulties and establishes now an improved cultivation and fermentation process for microalgae biomass.
- 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
The described technology enables the fast and competitive production of biogas in a continuous biotechnological process in industrial scale.
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StichworteMikroalge, Biogasherstellung, reduzierter Stickstoffgehalt, Microalgae, Biogas generation, low Nitrogen Level