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Anaerobic digestion of stillage from a pilot scale wood to ethanol process i. stillage characterization



Anaerobic digestion of stillage from a pilot scale wood to ethanol process i. stillage characterization



Environmental Technology Letters 7(6): 325-334



Stillage, the wastewater produced by the New Zealand Forest Research Institute pilot scale wood-ethanol process, has been characterised in order to assess its suitability for treatment by anaerobic digestion. Major characteristics are:volume, 20.4 l kg oven dry wood-1; COD, 25.5 g l-1; BOD5, 13.2 g l-1; colour, 4200 CPU. It is a relatively strong, highly-coloured, soluble wastewater. The organic matter is composed mainly of unfermented pentose sugars, and carbohydrate and lignin degradation products. Based on the toxicity and biogradability of these compounds, the stillage should be amenable to anaerobic digestion.

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