Abstract
Phenolic aldehydes resulting from lignocellulosic hydrolysis have often been considered harmful to the anaerobic cultures. Depending on the type of lignin, syringaldehyde present in hardwood and grass lignin can be produced as a by-product of its breakdown in varying extents. The influence of two mixed co-substrates, glucose and sodium acetate, on syringaldehyde degradation by anaerobic thermophilic cultures (50±2 °C) was assessed in the present work. Based on the monitoring of pH, chemical oxygen demand (COD) levels and UV–visible spectra in samples collected from batch bioreactors, it can be concluded that syringaldehyde is more prone to undergo anaerobic degradation in the presence of co-substrates. Both a reduction of the acclimatization period and an improvement in the COD removal (92.0%) were observed. As the only carbon source, syringaldehyde seems to be hardly degraded rendering a low efficiency of COD removal (53.2%). Some insights on the main alterations of syringaldehyde by anaerobic thermophilic cultures are also given.
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