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Effect of liquid nitrogen pre-treatment on various types of wool waste fibres for biogas production

机译:液氮预处理对生产沼气的各种羊毛废纤维的影响

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摘要

This study investigated the role of liquid nitrogen (LN2) in increasing microbial accessibility of wool proteins for biogas production. It involves a mechanical size reduction of four different types of raw wool fibres, namely, Blackface, Bluefaced Leicester, Texel and Scotch Mule, in presence of liquid nitrogen, followed by the determination of the methane production potential of the pre-treated wool fibres. The highest methane yield, 157.3 cm3 g−1 VS, was obtained from pre-treated Scotch mule wool fibre culture, and represented more than 80% increase when compared to the yield obtained from its raw equivalent culture. The increase in biogas yield was attributed to the effectiveness of LN2 in enhancing particle size reduction and the consequent increase in wool solubility and bioavailability. Results also showed that LN2 pre-treatment can enhance size reduction but has limited effect on the molecular structure. The study also showed that the biogas potential of waste wool fibres varies with the type and source of wool.
机译:这项研究调查了液氮(LN2)在增加羊毛蛋白在沼气生产中的微生物可及性方面的作用。它涉及在液氮存在下机械减小四种不同类型的原羊毛纤维的尺寸,即黑面,蓝面莱斯特,特塞尔和苏格兰M子,然后确定预处理后的羊毛纤维的甲烷生产潜力。从预处理的苏格兰m子羊毛纤维培养物中获得的最高甲烷产量为157.3 cm 3 g -1 VS,与甲烷相比,提高了80%以上。从其原始等效培养物中获得的产量。沼气产量的增加归因于LN2在增强粒径减小方面的有效性以及随之而来的羊毛溶解度和生物利用度的增加。结果还表明,LN2预处理可以增强尺寸减小,但对分子结构的作用有限。研究还表明,废羊毛纤维的沼气潜力随羊毛的类型和来源而变化。

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