Related Experiment Videos
Microbial hydrogen production with immobilized sewage sludge
Shu-Yii Wu1, Chi-Num Lin, Jo-Shu Chang
1Department of Chemical Engineering, Feng Chia University, Taichung, Taiwan 407, Republic of China.
Biotechnology Progress
|October 5, 2002
Summary
Immobilizing municipal sewage sludge enhanced hydrogen gas production. Activated carbon addition significantly boosted efficiency, while other materials improved stability, with acclimated ALSC cells showing superior durability for practical applications.
Area of Science:
- Biotechnology
- Environmental Engineering
- Renewable Energy
Background:
- Municipal sewage sludge is a potential substrate for biohydrogen production.
- Cell immobilization techniques can improve the efficiency of anaerobic fermentation.
- Various materials like activated carbon (AC), polyurethane (PU), and acrylic latex plus silicone (ALSC) can be used for cell immobilization.
Purpose of the Study:
- To assess the performance of different immobilized-cell systems for hydrogen gas production from sewage sludge.
- To identify the optimal immobilized-cell strategy for practical hydrogen fermentation applications.
- To evaluate the impact of immobilization materials on hydrogen production rate, yield, and operational stability.
Main Methods:
- Cell immobilization using gel entrapment (alginate) modified with AC, PU, and ALSC.
- Anaerobic fermentation of sucrose as the limiting carbon source.
- Assessment of hydrogen production rate, substrate yield, metabolite profiles, and kinetic parameters (Michaelis-Menten model).
- Evaluation of cell durability and stability over repeated fermentation runs.
- Acclimation of immobilized cells to enhance hydrogen production.
Main Results:
- Immobilized-cell systems showed higher hydrogen production efficiency than suspended-cell systems.
- Alginate gel with activated carbon (CA/AC cells) enhanced hydrogen production rate by 70% and yield by 52%.
- PU and ALSC supplementation improved mechanical strength and stability but reduced the production rate.
- Acclimation significantly increased hydrogen production rates, with CA/AC cells showing a 25-fold increase.
- ALSC cells demonstrated superior durability, enabling stable hydrogen production for over 24 cycles.
Conclusions:
- Activated carbon-modified alginate immobilization is effective for enhancing hydrogen production from sewage sludge.
- While PU and ALSC improve stability, CA/AC offers superior production efficiency.
- Acclimated ALSC immobilized cells provide a durable and efficient system for practical biohydrogen production.