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Use of solid residue from thermal power plant (fly ash) for enhancing sewage sludge anaerobic digestion: Influence of fly ash particle size

AuthorsMontalvo, Silvio; Cahn, I.; Borja Padilla, Rafael CSIC ORCID ; Huiliñir, César; Guerrero, Lorna
KeywordsAnaerobic digestion
Fly ash, metals
Methane production
Mixed sludge
Issue DateNov-2017
CitationBioresource Technology 244 (1): 416-422 (2017)
AbstractThe influence of fly ash particle size on methane production and anaerobic biodegradability was evaluated. Assays with different fly ash particle sizes (0.8–2.36 mm) at a concentration of 50 mg/L were ran under mesophilic conditions. In anaerobic processes operating with fly ash, greater removal of both volatile total and suspended solids, chemical oxygen demand (total and soluble) was achieved, with an increase of methane production between 28% and 96% compared to the control reactors. The highest increase occurred at ash particles sizes of 1.0–1.4 mm. The metal concentrations in the digestates obtained after anaerobic digestion of sewage sludge are far below those considered as limiting for the use of sludge in soils.
Description32 Páginas; 5 Tablas; 4 Figuras
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