Fly ash as stimulant for anaerobic digestion: effect over hydrolytic stage and methane generation rate
| Autor: | Andrea Carvajal, Rafael Borja, Lorna Guerrero, Mario Toledo, Clio Peirano, Cristopher Da Silva, Andrea Barahona, César Huiliñir, Silvio Montalvo |
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| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
Secondary sludge Environmental Engineering 020209 energy Microorganism Kinetics Fly ash 02 engineering and technology 010501 environmental sciences complex mixtures Coal Ash 01 natural sciences Methane Hydrolysis chemistry.chemical_compound Bioreactors 0202 electrical engineering electronic engineering information engineering Bioreactor Anaerobiosis 0105 earth and related environmental sciences Water Science and Technology Anaerobic degradation Sewage Chemistry fungi technology industry and agriculture respiratory system Particulates Anaerobic digestion Metals Nuclear chemistry |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2019.391 |
| Popis: | Thermoelectric fly ash was used as a micronutrient source for microorganisms in the anaerobic digestion process of thermally pretreated (1 hour, 120 °C) secondary sludge. The obtained results not only suggest that fly ash improves methane generation in the conversion of volatile fatty acids into methane, but also show a new observation, that the fly ash contributes in the particulate organic solubilization. The maximum methane production rate increased from 6.52 mL/L/d to 22.59 mL/L/d when fly ash was added at a dosage of 150 mg/L in biochemical methane potential tests compared with tests with no added ash. Additionally, the kinetic constants of the hydrolysis of particulate organic matter were obtained in both cases (with and without added ash) in batch reactors using a first-order kinetic model; in the case of no addition, the first-order kinetic parameter was 0.019 ± 0.002 d−1, while with ashes this value increased to 0.045 ± 0.000 d−1. Therefore, the addition of fly ash improves methane generation and hydrolytic kinetics in different orders of magnitude. |
| Databáze: | OpenAIRE |
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