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Performance evaluation of micro-aerobic hydrolysis of mixed sludge: Optimum aeration and effect on its biochemical methane potential

AuthorsMontalvo, Silvio; Ojeda, Felipe; Huiliñir, César; Guerrero, Lorna; Borja Padilla, Rafael ; Castillo, Alejandra
KeywordsAerobic hydrolysis
Anaerobic digestion
Methane production
Mixed sludge
Issue Date17-Aug-2016
PublisherTaylor & Francis
CitationJournal of Environmental Science and Health, Part A: (2016)
AbstractThis study evaluated the performance of a micro-aerobic hydrolysis of mixed sludge and its influence as a pretreatment of this waste for its subsequent anaerobic digestion. Three experimental series were carried out to evaluate the optimum micro-aeration levels in the range from 0.1 to 0.5 air volume/min.reactor volume (vvm) and operation times within the range of 24–60 h. The maximum methane yield [35 mL CH4/g volatile suspended solids (VSS) added] was obtained for an aeration level of 0.35 vvm. This methane yield value increased 114% with respect to that obtained with the non-aerated sludge. In the micro-aeration process carried out at an aeration level of 0.35 vvm, increases in soluble proteins and total sugars concentrations of 185% and 192% with respect to their initial values were found, respectively, after 48 h of aeration. At the above micro-aerobic conditions, soluble chemical oxygen demand (CODS) augmented 150%, whereas VSS content decreased until 40% of their initial respective values. Higher COD increases and VSS decreases were found at 60 h of micro-aeration, but the above parameters did not vary significantly with respect to the values found at 48 h.
Description31 Páginas; 8 Figuras; 3 Tablas
Publisher version (URL)http://dx.doi.org/10.1080/10934529.2016.1215195
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