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| Content Provider | Directory of Open Access Journals (DOAJ) |
|---|---|
| Author | Elia Judith Martínez Ana Sotres Cristián B. Arenas Daniel Blanco Olegario Martínez Xiomar Gómez |
| Abstract | The effect of hydrogen pulse addition on digestion performance of sewage sludge was evaluated as a means for studying the increase in efficiency of methane production. Microbial communities were also evaluated to get an insight of the changes caused by the operational modifications of the digester. An energy evaluation of this alternative was performed considering the theoretical process of coupling bioelectrochemical systems (BES) for the treatment of wastewater along with hydrogen production and the subsequent anaerobic digestion. The addition of hydrogen to sewage sludge digestion resulted in an increase of 12% in biogas production over the control (1353 mL $CH_{4}$ $d^{−1}$ at an injection flow rate of 1938 mL $H_{2}$ $d^{−1}$). The liquid phase of the sludge reactor and the $H_{2}$ supplemented one did not show significant differences, thus indicating that the application of hydrogen as the co-substrate was not detrimental. High-throughput sequencing analysis showed slight changes in archaeal relative abundance after hydrogen addition, whereas eubacterial community structure and composition revealed noteworthy shifts. The mass and energy balance indicated that the amount of hydrogen obtained from a hypothetical BES can be assimilated in the sludge digester, improving biogas production, but this configuration was not capable of covering all energy needs under the proposed scenario. |
| e-ISSN | 19961073 |
| DOI | 10.3390/en12071228 |
| Journal | Energies |
| Issue Number | 7 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI AG |
| Publisher Date | 2019-03-01 |
| Publisher Place | Switzerland |
| Access Restriction | Open |
| Subject Keyword | Technology Sludge Digestion Hydrogen Addition Microbial Community Analysis Energy Performance |
| Content Type | Text |
| Resource Type | Article |
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