The effect of low temperature (5-29 degrees C) and adaptation on the methanogenic activity of biomass

Applied Microbiology and Biotechnology
R H Kettunen, J Rintala

Abstract

The influence of low temperature (5-29 degrees C) on the methanogenic activity of non-adapted digested sewage sludge and on temperature/leachate-adapted biomass was assayed by using municipal landfill leachate, intermediates of anaerobic degradation (propionate) and methane precursors (acetate, H2/CO2) as substrates. The temperature dependence of methanogenic activity could be described by Arrhenius-derived models. However, both substrate and adaptation affected the temperature dependence. The adaptation of biomass in a leachate-fed upflow anaerobic sludge-blanket reactor at approximately 20 degrees C for 4 months resulted in a sevenfold and fivefold increase of methanogenic activity at 11 degrees C and 22 degrees C respectively. Both acetate and H2/CO2 were methanized even at 5 degrees C. At 22 degrees C, methanogenic activities (acetate 4.8-84 mM) were 1.6-5.2 times higher than those at 11 degrees C. The half-velocity constant (Ks) of acetate utilization at 11 degrees C was one-third of that at 22 degrees C while a similar Ki was obtained at both temperatures. With propionate (1.1-5.5 mM) as substrate, methanogenic activities at 11 degrees C were half those at 22 degrees C. Furthermore, the residual concentration of the subst...Continue Reading

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