Intermittent versus sequential dark-photo fermentative hydrogen production as an alternative for bioenergy recovery from protein-rich effluents
| Autor: | Ahmed Tawfik, Naira Meky, Manabu Fujii, Mona G. Ibrahim, Ahmed Elreedy |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
food.ingredient
020209 energy 02 engineering and technology Gelatin Industrial and Manufacturing Engineering Ammonia chemistry.chemical_compound food 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Biohydrogen Food science 0204 chemical engineering Electrical and Electronic Engineering Rhodospirillaceae Civil and Structural Engineering biology Mechanical Engineering Substrate (chemistry) Building and Construction biology.organism_classification Pollution Anaerobic digestion General Energy chemistry Fermentative hydrogen production Photosynthetic bacteria |
| Zdroj: | Energy. 217:119326 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2020.119326 |
| Popis: | The anaerobic digestion of protein-based effluents generally has the risk of ammonia inhibition. While the use of dark-followed by photo-fermentation process, at acidic pH, could be useful for addressing this problem, the activity of photosynthetic bacteria is deteriorated at the low pH values. Hence, in this study, intermittent dark-photo circular baffled reactor (IDP-CBR) was introduced to maintain the pH level (5.5–6.5), where biohydrogen is expected to be efficiently produced from gelatin-based substrate. We designed a four-compartments (i.e., C1 to C4) lab-scale IDP-CBR where C1 and C3 are dark-treated, and C2 and C4 are light-treated. The results revealed that peak hydrogen yield (HY) was achieved at initial gelatin of 2.0 gCOD/L, 24 h-HRT, and initial pH 6.5. The longer HRT provided better substrate conversion efficiency, and the use of higher pH (i.e., 6.5) promoted the photo-fermentation compartments (C2 and C4); further, this relatively acidic pH reduced the availability of free-ammonia. The 16S rRNA gene analysis showed that Clostridiaceae_1 and Rhodospirillaceae were the adapted bacteria that could produce dark- and light-dependent hydrogen, respectively. The comparison between IDP-CBR and the sequential configuration highlighted the superior performance of IDP-CBR in maintaining the medium pH, which promoted the light-dependent biohydrogen production (up to 13%). |
| Databáze: | OpenAIRE |
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