Chemical pulp mills have a need to diversify their end-product portfolio due to the current changing bio-economy. In this study, the methane potential of brown, oxygen delignified and bleached pulp were evaluated in order to assess the potential of converting traditional fibers; as well as microcrystalline cellulose and filtrates; to energy. Results showed that high yields (380 mL CH4/gVS) were achieved with bleached fibers which correlates with the lower presence of lignin. Filtrates from the hydrolysis process on the other hand, had the lowest yields (253 mL CH4/gVS) due to the high amount of acid and lignin compounds that cause inhibition. Overall, substrates had a biodegradability above 50% which demonstrates that they can be subjected to efficient anaerobic digestion. An energy and cost estimation showed that the energy produced can be translated into a significant profit and that methane production can be a promising new alternative option for chemical pulp mills.
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机译：由于当前不断变化的生物经济，化学纸浆厂需要多样化其最终产品组合。在这项研究中，评估了棕色，氧脱木素和漂白纸浆的甲烷潜力，以评估转化传统纤维的潜力。以及微晶纤维素和滤液；能源。结果表明，漂白纤维可实现高产量（380 mL CH4 / gVS），这与木质素含量较低相关。另一方面，由于大量的酸和木质素化合物会产生抑制作用，因此水解过程中的滤液收率最低（253 mL CH4 / gVS）。总体而言，底物的生物降解性高于50％，这表明它们可以进行有效的厌氧消化。能源和成本估算表明，所产生的能源可以转化为可观的利润，而甲烷生产可以成为化学制浆厂的有希望的新替代选择。
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