Integrated dark-photo fermentative hydrogen production from synthetic gelatinaceous wastewater via cost-effective hybrid reactor at ambient temperature
| Autor: | Ahmed Tawfik, Naira Meky, Ahmed Elreedy, Manabu Fujii, Mona G. Ibrahim |
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| Rok vydání: | 2020 |
| Předmět: |
genetic structures
Hydraulic retention time Renewable Energy Sustainability and the Environment Chemistry 020209 energy Energy Engineering and Power Technology 02 engineering and technology Pulp and paper industry Anaerobic digestion Ammonia chemistry.chemical_compound Fuel Technology 020401 chemical engineering Nuclear Energy and Engineering Wastewater Fermentative hydrogen production 0202 electrical engineering electronic engineering information engineering Hybrid reactor Sewage treatment sense organs 0204 chemical engineering Energy source |
| Zdroj: | Energy Conversion and Management. 203:112250 |
| ISSN: | 0196-8904 |
| DOI: | 10.1016/j.enconman.2019.112250 |
| Popis: | The industrial application of anaerobic digestion to treat protein-rich wastewater (e.g., gelatin) is promising; however, inhibitory effects such as released excess ammonia on methanogens causes limitations. This study investigated the potential of sequential dark and photo-fermentation for wastewater treatment and simultaneous bio-hydrogen production (as energy source). To this end, a new configuration, namely dark-photo circular baffled reactor (DP-CBR) was introduced and operated at ambient temperature (21 ± 10 °C). The reactor was composed of four identical compartments, where fluorescent tubes were installed to the last two compartments, i.e., C1-C2 (dark) and C3-C4 (photo). The long-term impact of main operational parameters (i.e., hydraulic retention time [HRT] of 6, 12 and 24 h at initial pH of 5.5 and 6.5) was assessed. Maximum hydrogen yield (HY) of 0.4 L/gCOD, COD removal of 82%, and organic-N removal of 95% were obtained at HRT of 24 h and initial pH of 6.5. Increasing HRT was found to maintain the reactor efficiency at ambient temperature. Lowering initial pH to 5.5 deteriorated the dark-treatment at C1 and C2, resulting in lower local HY and ammonification efficiency. Further, the results confirmed that higher HY was achieved in the photo-fermentation, as the protein hydrolysis was mainly achieved in the dark-fermentation. The residual free ammonia ( |
| Databáze: | OpenAIRE |
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