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Optimization of two-phase thermophilic anaerobic digestion of biowaste for bio-hythane production through reject water recirculation

Cavinato, Cristina and Bolzonella, David and Fatone, Francesco and Cecchi, Franco and Pavan , Paolo (2012) Optimization of two-phase thermophilic anaerobic digestion of biowaste for bio-hythane production through reject water recirculation. Bioresource Technology .

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Abstract

The optimization of a two-phase thermophilic anaerobic process treating biowaste for hydrogen and methane production was carried out at pilot scale using two stirred reactors (CSTRs) and without any physical/chemical pretreatment of inoculum. During the experiment the hydrogen production at low hydraulic retention time (3d) was tested, both with and without reject water recirculation and at two organic loading rate (16 and 21 kgTVS/m3d). The better yields were obtained with recirculation where the pH reached an optimal value (5.5) thanks to the buffering capacity of the system. The specific gas production of the first reactor was 51 l/kgVSfed and H2 content in biogas 37%. The mixture of gas obtained from the two reactors met the standards for the biohythane mix only when lower loading rate were applied to the first reactor, with a composition of 6.7% H2, 40.1% CO2 and 52.3% CH4, and with an overall SGP of 0.78 m3/kgVSfed.

Item Type:Article
Subjects:Ecology and Environment
ID Code:935
Deposited By:Dr. Cristina Cavinato
Deposited On:22 Oct 2012 09:35
Last Modified:22 Oct 2012 09:35

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