Photosynthetic upgrading of biogas from anaerobic digestion of mixed sludge in an outdoors algal-bacterial photobioreactor at pilot scale
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| Název: | Photosynthetic upgrading of biogas from anaerobic digestion of mixed sludge in an outdoors algal-bacterial photobioreactor at pilot scale |
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| Autoři: | Méndez, Lara, García, Dimas, Pérez, Enrique, Blanco, Saúl, Muñoz Torre, Raúl |
| Přispěvatelé: | Ecologia, Facultad de Ciencias Biologicas y Ambientales |
| Zdroj: | BULERIA. Repositorio Institucional de la Universidad de León Universidad de León UVaDOC. Repositorio Documental de la Universidad de Valladolid instname Universidad de Valladolid |
| Informace o vydavateli: | Elsevier BV, 2022. |
| Rok vydání: | 2022 |
| Témata: | Sludge management, Biogas, Biogás, Biometano, Algal-bacterial photobioreactor, 7. Clean energy, 01 natural sciences, Ecología. Medio ambiente, 3322.05 Fuentes no Convencionales de Energía, 6. Clean water, Photobioreactors, Fotobioreactores, 13. Climate action, Anaerobic digestion, Biogas upgrading, Ingenierías, 3308.10 Tecnología de Aguas Residuales, 2417.07 Algología (Ficología), Biomethane, 0105 earth and related environmental sciences |
| Popis: | [EN] Anaerobic digestion can biotransform the biodegradable fraction of sewage sludge into biogas, while the symbiotic action of algal-bacterial consortia can remove both the CO2 and H2S from biogas and nutrients from digestate. A 100 L anaerobic digester operated at 20 days of retention time coupled with a 180 L high-rate algal pond (HRAP) engineered to upgrade the biogas and treat the liquid fraction of the pilot digester was optimized along four operational stages: (I) operation with a greenhouse during winter; (II) operation without greenhouse; (III) process supplementation with NaHCO3; (IV) process supplementation with Na2CO3. The biogas produced was composed of 63.7 ± 2.9% CH4, 33.7 ± 1.9% CO2, 0.5 ± 0.3% O2 and 1.6 ± 1.1% N2. An average methane productivity of 324.7 ± 75.8 mL CH4 g VSin−1 and total COD removals of 48 ± 20% were recorded in the digester. The CH4 concentration in the biomethane gradually decreased to 87.6 ± 2.0% and 85.1 ± 1.3% at the end of stage I and II, respectively, attributed to the loss of inorganic carbon in the HRAP. The supplementation of NaHCO3 and Na2CO3 mediated an increase in the CH4 content to 90.4 ± 1.5 and 91.2 ± 0.7% in stages III and IV, respectively. Steady state CO2 removals of 90% and 88% in stages I and II, and 95.7 and 97.6% in stages III and IV, respectively, were recorded. A constant biomass productivity of 22 g m−2 d−1, set by daily harvesting 26.5 g dry algal-bacterial biomass from the bottom of the settler, was maintained concomitantly with a complete removal of the N and P supplied via centrate The authors thank FUNDACION DOMINGO MARTINEZ, the Regional Government of Castilla y León and the EU-FEDER program (CLU 2017-09, CL-EI-2021-07 and UIC 315). The Spanish Ministry of Science and Innovation (FJC 2018-038402-I) is also acknowledged for funding the Juan de la Cierva-Formación research contract of Lara Mendez. In addition, the authors want to acknowledge the National Autonomous University of Nicaragua (UNAN-Managua) and FUNDACION CAROLINA for funding the research stay of Dimas Garcia SI |
| Druh dokumentu: | Article |
| Popis souboru: | application/pdf |
| Jazyk: | English |
| ISSN: | 2214-7144 |
| DOI: | 10.1016/j.jwpe.2022.102891 |
| Přístupová URL adresa: | https://hdl.handle.net/10612/19495 https://www.sciencedirect.com/science/article/pii/S221471442200335X https://uvadoc.uva.es/handle/10324/53596 https://doi.org/10.1016/j.jwpe.2022.102891 https://hdl.handle.net/10612/19495 |
| Rights: | CC BY NC ND |
| Přístupové číslo: | edsair.doi.dedup.....fe6d04313467ffd68ea1def0b3fcaf1c |
| Databáze: | OpenAIRE |
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Nájsť tento článok vo Web of Science | Abstrakt: | [EN] Anaerobic digestion can biotransform the biodegradable fraction of sewage sludge into biogas, while the symbiotic action of algal-bacterial consortia can remove both the CO2 and H2S from biogas and nutrients from digestate. A 100 L anaerobic digester operated at 20 days of retention time coupled with a 180 L high-rate algal pond (HRAP) engineered to upgrade the biogas and treat the liquid fraction of the pilot digester was optimized along four operational stages: (I) operation with a greenhouse during winter; (II) operation without greenhouse; (III) process supplementation with NaHCO3; (IV) process supplementation with Na2CO3. The biogas produced was composed of 63.7 ± 2.9% CH4, 33.7 ± 1.9% CO2, 0.5 ± 0.3% O2 and 1.6 ± 1.1% N2. An average methane productivity of 324.7 ± 75.8 mL CH4 g VSin−1 and total COD removals of 48 ± 20% were recorded in the digester. The CH4 concentration in the biomethane gradually decreased to 87.6 ± 2.0% and 85.1 ± 1.3% at the end of stage I and II, respectively, attributed to the loss of inorganic carbon in the HRAP. The supplementation of NaHCO3 and Na2CO3 mediated an increase in the CH4 content to 90.4 ± 1.5 and 91.2 ± 0.7% in stages III and IV, respectively. Steady state CO2 removals of 90% and 88% in stages I and II, and 95.7 and 97.6% in stages III and IV, respectively, were recorded. A constant biomass productivity of 22 g m−2 d−1, set by daily harvesting 26.5 g dry algal-bacterial biomass from the bottom of the settler, was maintained concomitantly with a complete removal of the N and P supplied via centrate<br />The authors thank FUNDACION DOMINGO MARTINEZ, the Regional Government of Castilla y León and the EU-FEDER program (CLU 2017-09, CL-EI-2021-07 and UIC 315). The Spanish Ministry of Science and Innovation (FJC 2018-038402-I) is also acknowledged for funding the Juan de la Cierva-Formación research contract of Lara Mendez. In addition, the authors want to acknowledge the National Autonomous University of Nicaragua (UNAN-Managua) and FUNDACION CAROLINA for funding the research stay of Dimas Garcia<br />SI |
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| ISSN: | 22147144 |
| DOI: | 10.1016/j.jwpe.2022.102891 |