To explore complementary biochemical pathways, the fermentation of S. obliquus biomass by the co-culture of C. butyricum
and LE37 was tested. The enrichment of LE37 culture with C.
butyricum would likely improve the conversion of starch, and
would add the capability of xylose conversion (Fig. 1b). The experimental results show that, for all the tested concentrations of
microalgal biomass, the co-culture of LE37 and C. butyricum
improved the H2 yield (Table 1). When using 50 g/L of microalgal
biomass, the H2/CO2 ratio in the biogas was also increased from
0.75 to 1.1 with the introduction of the clostridial strain
(Table 1). This value represents an increase of 47% in the H2 purity
when compared with the gas produced in the fermentation by
LE37. Although the fermentation by the co-culture was the most
successful in terms of H2 volumetric production, there is a nonnegligible increase in CO2 when compared with the results of C.
butyricum (Table 1). The decrease in the purity of the produced biogas is a property which makes a subsequent purification stage
more difficult. In a membrane separation module for bioH2 enrichment, CO2 was shown to negatively affect the permeation of H2
through the membrane [42]. The fermentation conditions, that in
the present case correspond to the best selection between a pure
culture or a microbial consortium, should thus be properly
addressed in order to limit CO2 evolution as much as possible.
To explore complementary biochemical pathways, the fermentation of S. obliquus biomass by the co-culture of C. butyricumand LE37 was tested. The enrichment of LE37 culture with C.butyricum would likely improve the conversion of starch, andwould add the capability of xylose conversion (Fig. 1b). The experimental results show that, for all the tested concentrations ofmicroalgal biomass, the co-culture of LE37 and C. butyricumimproved the H2 yield (Table 1). When using 50 g/L of microalgalbiomass, the H2/CO2 ratio in the biogas was also increased from0.75 to 1.1 with the introduction of the clostridial strain(Table 1). This value represents an increase of 47% in the H2 puritywhen compared with the gas produced in the fermentation byLE37. Although the fermentation by the co-culture was the mostsuccessful in terms of H2 volumetric production, there is a nonnegligible increase in CO2 when compared with the results of C.butyricum (Table 1). The decrease in the purity of the produced biogas is a property which makes a subsequent purification stagemore difficult. In a membrane separation module for bioH2 enrichment, CO2 was shown to negatively affect the permeation of H2through the membrane [42]. The fermentation conditions, that inthe present case correspond to the best selection between a pureculture or a microbial consortium, should thus be properlyaddressed in order to limit CO2 evolution as much as possible.
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