Use of solid residue from thermal power plant (fly ash) for enhancing sewage sludge anaerobic digestion: Influence of fly ash particle size. (November 2017)

• Record Type: Journal Article
• Authors: Montalvo, S.; Cahn, I.; Borja, R.; Huiliñir, C.; Guerrero, L.
• Is Part Of: Bioresource technology. Volume 244:Part 1(2017)
• Page Start: 416
• Page End: 422
• Publication Date: 2017-11
• Subjects: Anaerobic digestion -- Fly ash, metals -- Methane production -- Mixed sludge; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.07.159
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Effect of different fly ash particle sizes on anaerobic digestion was studied. Particle sizes between 0.8 and 2.36 mm were evaluated in mesophilic conditions. Particle sizes in the range of 1–1.4 mm enhanced methane yield and biodegradability. Metal concentrations in sludge digestate allow its use in agricultural soils. Abstract: The 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.