Nonsterile Process for Biohydrogen Production: Recent Updates, Challenges, and Opportunities

Area of Science:

• Biotechnology
• Renewable Energy
• Environmental Science

Background:

• Hydrogen (H2) is a clean energy carrier with potential for reducing carbon emissions.
• Biological H2 production via microbial fermentation is attractive for renewable biofuel generation.
• Sterilization is critical for yield and efficiency, but sterile conditions increase costs.

Purpose of the Study:

• To review microbial fermentative processes for H2 production under nonsterile conditions.
• To discuss strategies for improving H2 production sustainability and cost-effectiveness.
• To highlight the potential of low-cost feedstocks like biowaste.

Main Methods:

• Review of existing literature on microbial fermentative H2 production.
• Analysis of sterilization strategies (heat inactivation, membrane-based) for microbial fermentation.
• Evaluation of biotransformation under nonsterile conditions using various feedstocks.

Main Results:

• Nonsterile biotransformation is desirable for stable and sustainable H2 production.
• Pure sugars are costly feedstocks for H2 production under sterile conditions.
• Low-cost feeds like biowaste require appropriate sterilization to manage microbial contamination.

Conclusions:

• Microbial fermentative H2 production under nonsterile conditions offers a sustainable alternative.
• Utilizing low-cost feedstocks like biowaste can enhance economic viability.
• Further strategies are needed to optimize nonsterile processes for cleaner H2 production.