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Título

Fly ash as stimulant for anaerobic digestion: effect over hydrolytic stage and methane generation rate

AutorGuerrero, Lorna; Da Silva, Cristopher; Barahona, Andra; Montalvo, Silvio; Huiliñir, César; Borja Padilla, Rafael CSIC ORCID ; Peirano, Clio; Toledo, Mario; Carvajal, Andrea
Palabras claveAnaerobic degradation
Fly ash
Kinetics
Methane
Metals
Secondary sludge
Fecha de publicación27-nov-2019
EditorIWA Publishing
CitaciónWater Science and Technology 80 (7): 1384–1391 (2019)
ResumenThermoelectric 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.
Versión del editorhttp://dx.doi.org/10.2166/wst.2019.391
URIhttp://hdl.handle.net/10261/200697
ISSN0273-1223
E-ISSN1996-9732
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