Photobiological hydrogen production at pilot scale via integrated bioprocess optimization

Overview

This innovative bioprocess platform enables the continuous, pilot-scale production of green hydrogen using a specialized mutant strain of the microalga Chlamydomonas reinhardtii. Unlike conventional methods that rely on damaging algae cells to trigger hydrogen synthesis, this system operates under nutrient-replete, non-destructive conditions. This breakthrough allows for the simultaneous, efficient co-production of clean solar fuel and high-value, nutrient-rich biomass suitable for the food, animal feed, and supplement industries.

Technical specifications

The technology centers on a redesigned, optimized photobioreactor system that enables stable, days-long hydrogen production. Key capabilities and features include:

• Enhanced productivity: Achieved a six-fold increase in volumetric hydrogen production compared to previous laboratory benchmarks.
• Biomass preservation: The process maintains high-quality algal biomass containing approximately 47% protein, along with essential amino acids, lipids, and beneficial pigments like lutein and beta-carotene.
• Scalable design: Successfully demonstrated at an 11-liter tubular photobioreactor scale, with techno-economic modeling identifying pathways to reach competitive production costs of $2–3 per kilogram of hydrogen.
• Circular economy integration: Designed for implementation within existing industrial algae cultivation facilities as a complementary revenue stream.

Technology readiness level

The technology is at level 4. It has successfully transitioned from laboratory-scale experiments to semi-industrial pilot testing using an 11-liter tubular photobioreactor. Ongoing efforts are focused on further optimizing production density and scaling to improve economic viability, with the project currently active in the commercialization and fundraising stages.