Factor-based assessment of continuous bio-H₂ production from cheese whey

Area of Science:

• Biotechnology
• Renewable Energy
• Environmental Science

Background:

• Dark fermentative hydrogen (H2) production from organic residues is a promising renewable energy source.
• Process complexity and interacting factors limit large-scale implementation.
• Synthetic cheese whey is a viable substrate for continuous H2 production.

Purpose of the Study:

• To gain detailed knowledge of continuous fermentative H2 production processes.
• To identify critical operating conditions for H2 production.
• To develop systematic considerations for process characterization and scale-up.

Main Methods:

• Continuous fermentative H2 production experiments using synthetic cheese whey.
• Analytical characterization of the fermentation broth.
• Mass balance calculations and statistical analyses (correlation and principal component analyses).

Main Results:

• Metabolic products primarily included acetate and butyrate, influenced by operating conditions.
• Lactate and succinate were also detected in some experiments.
• H2 yield, rate, and process stability correlated with operational and analytical parameters.
• Statistical analysis identified key factors influencing biogas generation and stability.

Conclusions:

• Hydrogen production features can be described by a reduced set of factors.
• Statistical models can aid in process monitoring and prediction.
• Understanding these factors is crucial for optimizing H2 fermentation and scale-up.