This study aimed to evaluate the impact of self fermentation on methane production as biological pretreatment of olive mill wastewater (OMW). The self-fermentation was carried out at room temperature without mixing and at natural light cycle. The batch assays were performed at the influent substrate concentration of 36.7 g VS/l (OMW 100%), 18,4 g VS/l (OMW 50%) and 9.2 g VS/l (OMW 25%). The methane production was performed at 37°C in mixing condition. The results of methane production were compared with those obtained using untreated OMW. The results of this study showed that the self fermentation process is a very effective pretreatment to produce methane. Only the self-fermented samples have produced methane from undiluted OMW and a maximum cumulative methane production of 7583 ± 138 mlCH4/L and a yield of 246 ± 10 mlCH4/ gVS were obtained. A yield increase of +13.5% at OMW dilution of 50% was also achieved as compared to untreated OMW results. Interestingly, in the anaerobic digestion of untreated OMW, high hydrogen yields, with an average value of 46.8 ± 1.9 mlH2/gVS, were obtained. Moreover a depletion around 20% v/v of polyphenols was recorded for all experimental set. © 2016 ETA-Florence Renewable Energies.

Self-fermentation: Innovative pretreatment for use high concentration of olive mill wastewater in anaerobic digestion plant

Massini, G.;Signorini, A.
2016

Abstract

This study aimed to evaluate the impact of self fermentation on methane production as biological pretreatment of olive mill wastewater (OMW). The self-fermentation was carried out at room temperature without mixing and at natural light cycle. The batch assays were performed at the influent substrate concentration of 36.7 g VS/l (OMW 100%), 18,4 g VS/l (OMW 50%) and 9.2 g VS/l (OMW 25%). The methane production was performed at 37°C in mixing condition. The results of methane production were compared with those obtained using untreated OMW. The results of this study showed that the self fermentation process is a very effective pretreatment to produce methane. Only the self-fermented samples have produced methane from undiluted OMW and a maximum cumulative methane production of 7583 ± 138 mlCH4/L and a yield of 246 ± 10 mlCH4/ gVS were obtained. A yield increase of +13.5% at OMW dilution of 50% was also achieved as compared to untreated OMW results. Interestingly, in the anaerobic digestion of untreated OMW, high hydrogen yields, with an average value of 46.8 ± 1.9 mlH2/gVS, were obtained. Moreover a depletion around 20% v/v of polyphenols was recorded for all experimental set. © 2016 ETA-Florence Renewable Energies.
Hydrogen production;Methane production;Olive mill wastewater;Phenols;Self fermentation;Biological pretreatment
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/4228
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