An increasing trend of the total reducing sugars can be seen after the substrate changed to 30% and to 66% of straw, and after the HRT changed from 21 to 14 d with 66% of straw.
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Plug-flow hydrolysis with lignocellulosic residues: effect of hydraulic retention time and thin-sludge recirculation.
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The sentences
High fluctuations in the gas production were detected, in which maximal production occurred after feeding events with a decreasing trend until the next feeding.