Research on photobiological H2 production is nowadays pointing towards the utilization of low cost substrates as sources of reduced carbon for H2 generation. Those substrates are usually either wastewaters or effluents deriving from other fermentation processes. This study was aimed at evaluating the feasibility and the hurdles of an hydrogen production process carried out with purple non sulfur bacteria (PNSB) using as substrate two effluents deriving from an anaerobic digestion process. The anaerobic digestion was carried out using the vegetable wastes produced by department stores. A preliminary screening carried out with several PNSBs pointed out that Rhodopseudomonas palustris AV32a was the one giving the most reproducible results. Different effluents have been tested so far, bringing to encouraging hydrogen production results: the very high amount of 17.3 LH2/Lculture has been obtained with a three-fold diluted, microelement-supplemented effluent; 9.2 LH2/Lculture were obtained with a two-fold diluted, not-supplemented effluent. However, the overall kinetics of production was quite slow, as the mean production rate was 11.46 mlH2 Lculture-1 h-1, while the maximum rate maintained for 24 hours was interestingly high (23.64 mlH2 Lculture-1 h-1). The main hurdles of the process consisted in the light-shading of the medium itself and in the presence of a particulate due to the nature of the primary source (chopped vegetable wastes). In conclusion, the combination of two biological processes that extract as much energy as possible from wastes is promising, but needs further optimizations, in particular with regard to the issues related to light distribution in the photobioreactor.

Use of anaerobic digester effluents for photobiological Hydrogen production / A. Adessi; G. Colica; R. De Philippis. - STAMPA. - (2013), pp. 20-20. (Intervento presentato al convegno BioH2 Conference tenutosi a Montreal, Canada nel 05-07.08.2013).

Use of anaerobic digester effluents for photobiological Hydrogen production

ADESSI, ALESSANDRA;COLICA, GIOVANNI;DE PHILIPPIS, ROBERTO
2013

Abstract

Research on photobiological H2 production is nowadays pointing towards the utilization of low cost substrates as sources of reduced carbon for H2 generation. Those substrates are usually either wastewaters or effluents deriving from other fermentation processes. This study was aimed at evaluating the feasibility and the hurdles of an hydrogen production process carried out with purple non sulfur bacteria (PNSB) using as substrate two effluents deriving from an anaerobic digestion process. The anaerobic digestion was carried out using the vegetable wastes produced by department stores. A preliminary screening carried out with several PNSBs pointed out that Rhodopseudomonas palustris AV32a was the one giving the most reproducible results. Different effluents have been tested so far, bringing to encouraging hydrogen production results: the very high amount of 17.3 LH2/Lculture has been obtained with a three-fold diluted, microelement-supplemented effluent; 9.2 LH2/Lculture were obtained with a two-fold diluted, not-supplemented effluent. However, the overall kinetics of production was quite slow, as the mean production rate was 11.46 mlH2 Lculture-1 h-1, while the maximum rate maintained for 24 hours was interestingly high (23.64 mlH2 Lculture-1 h-1). The main hurdles of the process consisted in the light-shading of the medium itself and in the presence of a particulate due to the nature of the primary source (chopped vegetable wastes). In conclusion, the combination of two biological processes that extract as much energy as possible from wastes is promising, but needs further optimizations, in particular with regard to the issues related to light distribution in the photobioreactor.
2013
. Abstracts of BioH2 Conference
BioH2 Conference
Montreal, Canada
A. Adessi; G. Colica; R. De Philippis
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/846162
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