Inhibition of hydrogen fermentation of organic wastes by lactic acid bacteria

Fermentative Hydrogen Production by Molasses; Effect of Hydraulic Retention Time, Organic Loading Rate and Microbial Dynamics

“…Nevertheless, it was demonstrated that bacteriocins can hinder non-closely related microorganisms, too. For instance, an inhibition effect of L. lactis on C. tyrobutyricum due to the excretion of the bacteriocin nisin Z was detected (Rilla, 2003) and of L. paracasei on C. acetobutylicum and C. butyricum (Noike, 2002). It can not be excluded that the lactobacilli present on this work exert a similar effect on the clostridia species.…”

“…that was present in an anaerobic sequencing batch reactor seeded with heat pre-treated sludge and operated at pH 5.0 using sweet sorghum syrup as substrate at OLR of 25 g sugar/(L•d) (Saraphirom & Reungsang, 2011). They justified it by their ability to produce bacteriocins as Noike et al (2002) suggested. None of these substances has been monitored, so a possible accumulation in concentrations that are inhibiting to the clostridia can only be determined by a general parameter as the COD.…”

“…In most cases, heat treatment of the seed sludge was applied, but it was not sufficient to inhibit the growth of lactic acid bacteria, although they can not form spores and it has been demonstrated in vials that heat treatment between 50 °C and 90 °C is sufficient (Noike et al, 2002). For instance, L. delbrueckii and L. fermentum w e r e a b l e t o b e i d e n t i f i e d a t b a t c h experiments producing hydrogen seeded with activated sludge and digester sludge thermally pre-treated at 65 °C for 30 min Hafez et al, 2010).…”

Feasibility of Bioenergy Production from Ultrafiltration Whey Permeate Using the UASB Reactors

“…It allows to reduce the lactic acid concentration in the influent, because it was reported, that the conversion efficiency of lactic acid to hydrogen is much lower than that of glucose or sucrose (Guo et al 2010). The coexistence of LAB (lactic acid bacteria) and the hydrogen producing bacteria was investigated by Noike et al (2002). They found, that hydrogen fermentation was replaced by lactic acid fermentation caused by LAB present in the raw wastewater.…”

“…They found, that hydrogen fermentation was replaced by lactic acid fermentation caused by LAB present in the raw wastewater. Their inhibitory effect on hydrogen production could be explained by excretion of bacteriocins (Noike et al, 2002).…”