利用厌氧消化副产物作为预处理剂提高玉米秸秆的生物甲烷产量：一种高效环保的策略。
Biomethane enhancement from corn straw using anaerobic digestion by-products as pretreatment agents: A highly effective and green strategy.
机构信息
Center of Biomass Engineering/College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
Center of Biomass Engineering/College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; Sanya Institute of China Agricultural University, Sanya 572025, China.
出版信息
Bioresour Technol. 2022 Jan;344(Pt B):126177. doi: 10.1016/j.biortech.2021.126177. Epub 2021 Oct 23.
The development of biogas projects feed by lignocellulosic biomass has been constrained by the high cost of pre- and post-treatment. In this study, a novel strategy for pretreatment by using two by-products, i.e., CO and liquid digestate (LD), generated from anaerobic digestion (AD) was developed to overcome these shortcomings. Results showed that corn straw pretreated in LD pressurized under 1 Mpa CO at 55 ℃ resulted in increased glucose and xylose contents and a 9.80% decrease in cellulose crystallinity. After 45 days of AD conversion, the methane yield increased by 50.97% compared with untreated straw. However, pretreatment in LD pressurized under 1 Mpa CO at 170 ℃ produced 5-hydroxymethylfurfural and furfural, which led to a decrease in methane production from the straw in the subsequent AD conversion. The alteration of the microbial community in the pretreated slurry at 55 °C was another potential contributor to the enhanced performance of AD.
利用来源于厌氧消化（AD）的两种副产物，即 CO 和液体消化物（LD）对木质纤维素生物质进行沼气工程预处理的发展受到预处理和后处理高成本的限制。在这项研究中，开发了一种预处理的新策略，即使用在 55°C 下加压至 1Mpa CO 的 LD 对玉米秸秆进行预处理，以克服这些缺点。结果表明，在 LD 中加压预处理的玉米秸秆在 1Mpa CO 下，在 55°C 下处理后葡萄糖和木糖含量增加，纤维素结晶度降低了 9.80%。与未处理的秸秆相比，经过 45 天的 AD 转化，甲烷产量增加了 50.97%。然而，在 1Mpa CO 下加压 LD 预处理在 170°C 下产生了 5-羟甲基糠醛和糠醛，这导致后续 AD 转化中来自秸秆的甲烷产量下降。在 55°C 下预处理浆液中微生物群落的改变是 AD 性能增强的另一个潜在因素。
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