High concentrations of acetate, propionate, butyrate and valerate
in the effluent of anaerobic digesters either indicate, that the
anaerobic process has not yet reached its steady-state after startup
(Gallert and Winter, 2008), may be inhibited (Gallert and Winter,
1997) or was overloaded (Gallert and Winter, 2005). In our biowaste
digesters butyrate and valerate were not or only found in
trace amounts during the first day of an increase of the OLR,
whereas acetate and propionate were present during start-up,
the following step-wise increases of the OLR and in the final stage
of biowaste and biowaste plus co-substrate digestion at very high
OLRs (Fig. 3). Butyrate and valerate were either not produced as
intermediates or more rapidly degraded to acetate, CO2 and hydrogen
than generated (Gallert and Winter, 2005).
High concentrations of acetate, propionate, butyrate and valeratein the effluent of anaerobic digesters either indicate, that theanaerobic process has not yet reached its steady-state after startup(Gallert and Winter, 2008), may be inhibited (Gallert and Winter,1997) or was overloaded (Gallert and Winter, 2005). In our biowastedigesters butyrate and valerate were not or only found intrace amounts during the first day of an increase of the OLR,whereas acetate and propionate were present during start-up,the following step-wise increases of the OLR and in the final stageof biowaste and biowaste plus co-substrate digestion at very highOLRs (Fig. 3). Butyrate and valerate were either not produced asintermediates or more rapidly degraded to acetate, CO2 and hydrogenthan generated (Gallert and Winter, 2005).
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