초록
<P><B>Abstract</B></P> <P>Recent studies suggest that the supplementation of powdered Fe° generates a positive effect on anaerobic fermentation processes but the exact relationship between metals with biological systems has not been fully elucidated. Experimental tests on dark fermentation (DF) were carried out at different Fe° concentrations. The anaerobic corrosion (AC) of Fe° and the production of H<SUB>2</SUB> through DF of Organic Waste Market (OWM) were tested separately, and subsequently DF tests with Fe° at 1 g/L and 2 g/L were carried out. A macroscopic dynamic study was conducted, using Röels approach based on relaxation times (τ<SUB>R</SUB>) to establish whether interactions between AC and DF phenomena exist. Experimental bioH<SUB>2</SUB> production and Fe° AC were fit by Gompertz and saturative models, respectively to estimate τ<SUB>R</SUB>. The results of the macro-analysis suggest that both phenomena are concurrent, with τ<SUB>R</SUB> of the same order of magnitude, generating a positive symbiotic effect. The experimental tests of hydrogen production via DF in presence of 2 g/L of Fe° showed an increase of 46% compared with the control tests, of amount of gas and a greater H<SUB>2</SUB>/CO<SUB>2</SUB> ratio. The results suggest an enhancement of key enzymes activity due to the action of iron increasing bioH<SUB>2</SUB> production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dark Fermentation with Fe° supplementation of Organic Market Waste tests. </LI> <LI> Low Fe° dosages resulted in increased bio-H<SUB>2</SUB> production. </LI> <LI> Röels relaxation time was applied to study the dynamics of involved phenomena. </LI> <LI> Volumetric H<SUB>2</SUB> production yield <I>vs.</I> control test increased of 46%. </LI> <LI> Fe° corrosion products interactions with the biological phase are proposed. </LI> </UL> </P>