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Biohydrogen Production in Continuous‐Flow Reactor Using Mixed Microbial Culture
The goal of the proposed project was to develop an anaerobic fermentation process that converts negative‐value organic wastes into hydrogen‐rich gas in a continuous‐flow reactor under different operating conditions, such as hydraulic retention time (HRT), heat treatment, pH, and substrates. A series of batch tests were also conducted in parallel to the continuous study to evaluate the hydrogen conversion efficiency of two different organic substrates, namely sucrose and starch. A heat shock (at 90°C for 15 minutes) was applied to the sludge in an external heating chamber known as a sludge activation chamber, as a method to impose a selection pressure to eliminate non‐spore‐forming, hydrogen‐consuming bacteria and to activate spore germination. The experimental results showed that the heat activation of biomass enhanced hydrogen production by selecting for hydrogen‐producing, spore‐forming bacteria. The batch feeding at a shorter HRT of 20 hours (or higher organic loading rate) favored hydrogen production, whereas, at a longer HRT of 30 hours, methane was detected in the gas phase. The major organic acids of hydrogen fermentation were acetate, butyrate, and propionate. Up to 23.1% of influent chemical oxygen demand was consumed in biomass synthesis. Batch tests showed that the hydrogen‐production potential of starch was lower than sucrose, and better conversion efficiency from starch was obtained at a lower pH of 4.5. However, addition of sucrose to starch improved the overall hydrogen‐production potential and hydrogen‐production rate. This study showed that sustainable biohydrogen production from carbohydrate‐rich substrates is possible through heat activation of settled sludge.
Biohydrogen Production in Continuous‐Flow Reactor Using Mixed Microbial Culture
The goal of the proposed project was to develop an anaerobic fermentation process that converts negative‐value organic wastes into hydrogen‐rich gas in a continuous‐flow reactor under different operating conditions, such as hydraulic retention time (HRT), heat treatment, pH, and substrates. A series of batch tests were also conducted in parallel to the continuous study to evaluate the hydrogen conversion efficiency of two different organic substrates, namely sucrose and starch. A heat shock (at 90°C for 15 minutes) was applied to the sludge in an external heating chamber known as a sludge activation chamber, as a method to impose a selection pressure to eliminate non‐spore‐forming, hydrogen‐consuming bacteria and to activate spore germination. The experimental results showed that the heat activation of biomass enhanced hydrogen production by selecting for hydrogen‐producing, spore‐forming bacteria. The batch feeding at a shorter HRT of 20 hours (or higher organic loading rate) favored hydrogen production, whereas, at a longer HRT of 30 hours, methane was detected in the gas phase. The major organic acids of hydrogen fermentation were acetate, butyrate, and propionate. Up to 23.1% of influent chemical oxygen demand was consumed in biomass synthesis. Batch tests showed that the hydrogen‐production potential of starch was lower than sucrose, and better conversion efficiency from starch was obtained at a lower pH of 4.5. However, addition of sucrose to starch improved the overall hydrogen‐production potential and hydrogen‐production rate. This study showed that sustainable biohydrogen production from carbohydrate‐rich substrates is possible through heat activation of settled sludge.
Biohydrogen Production in Continuous‐Flow Reactor Using Mixed Microbial Culture
Khanal, Samir Kumar (author) / Chen, Wen‐Hsing (author) / Li, Ling (author) / Sung, Shihwu (author)
Water Environment Research ; 78 ; 110-117
2006-02-01
8 pages
Article (Journal)
Electronic Resource
English
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