Effects of short-term temperature increases on the mesophilic anaerobic breakdown of sulfate containing synthetic wastewater

Application of molecular techniques to evaluate the methanogenic archaea and anaerobic bacteria in the presence of oxygen with different COD:Sulfate ratios in a UASB reactor

“…The predominance of SRB in UASB reactors with pre-adapted sludge to sulfate has been reported [10]. However, little is known about the composition of the microbial population or the performance of the reactors inoculated with sludge that presents reduced pre-availability of sulfate with oxygen.…”

Effect of COD:SO4 2− Ratio, HRT and Linoleic Acid Concentration on Mesophilic Sulfate Reduction: Reactor Performance and Microbial Population Dynamics

“…In comparison to the control cultures, a possible reason for the low acetate levels could be due to the inhibition of methanogenesis and hence, acetate utilization by SRBs in LA treated cultures (Figure 4b). According to Visser et al [33], in a heat treated culture to inhibit methanogenesis, acetate rapid consumption by SRBs resulted in increased SO4 2− reduction. In studies conducted by Dar et al [16], increasing the COD/SO4 2− ratio from 0.34 to 20.9 led to decreasing acetate production while increasing levels of propionate was observed.…”

Methane production in an UASB reactor operated under periodic mesophilic–thermophilic conditions

“…It is generally assumed that a transition from mesophilic to thermophilic conditions is accompanied by a significant (over 80%) and lengthy (over 4 days) decrease in methane production due to adaptation of methanogens to thermophilic temperatures (van Lier et al, 1992;Visser et al, 1993) Nevertheless, mesophilic methanogenic populations were shown to tolerate short-term temperature increases (Ahn and Forster, 2002;Speece and Kem, 1970) or sludge exchange between mesophilic and thermophilic reactors (Song et al, 2004).…”