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Biohydrogen production in continuous-flow reactor using mixed microbial culture.
Samir Kumar Khanal1, Wen-Hsing Chen, Ling Li
1Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames 50011-3232, USA.
Summary
Heat activation of sludge enhances biohydrogen production from organic waste. Shorter hydraulic retention times favor hydrogen, while longer times produce methane, indicating optimized conditions for sustainable energy generation.
Area of Science:
- Biotechnology
- Environmental Science
- Renewable Energy
Background:
- Organic waste presents disposal challenges and represents a potential resource.
- Biohydrogen production offers a sustainable alternative energy pathway.
- Anaerobic fermentation is a key process for converting organic matter into biogas.
Purpose of the Study:
- To develop an anaerobic fermentation process for converting organic waste into hydrogen-rich gas.
- To optimize the process using a continuous-flow reactor under various conditions.
- To evaluate the impact of heat activation on hydrogen production efficiency.
Main Methods:
- Utilized a continuous-flow reactor and parallel batch tests.
- Applied heat treatment (90°C for 15 min) to activate sludge and select for spore-forming bacteria.
- Investigated effects of hydraulic retention time (HRT), pH, and substrates (sucrose, starch).
Main Results:
- Heat activation significantly enhanced hydrogen production by selecting beneficial bacteria.
- Shorter HRT (20 hours) favored hydrogen, while longer HRT (30 hours) led to methane production.
- Starch had lower hydrogen potential than sucrose, but co-feeding improved efficiency; pH 4.5 optimized starch conversion.
Conclusions:
- Heat activation of settled sludge is a viable strategy for sustainable biohydrogen production.
- Optimizing HRT and substrate composition is crucial for maximizing hydrogen yield.
- Anaerobic fermentation offers a promising route for waste valorization and renewable energy generation.