Research on anaerobic digestion of corn stover enhanced by dilute acid pretreatment: Mechanism study and potential utilization in practical application

玉米秸秆 半纤维素 沼气 纤维素 化学 厌氧消化 制浆造纸工业 生物降解 木质素 醋酸 硫酸 发酵 磷酸 水解 稻草 废物管理 食品科学 甲烷 生物化学 有机化学 无机化学 工程类
作者
Yonglan Tian,Huayong Zhang,Xueyue Mi,Lijun Wang,Luyi Zhang,Yuejie Ai
出处
期刊:Journal of Renewable and Sustainable Energy [American Institute of Physics]
卷期号:8 (2) 被引量:24
标识
DOI:10.1063/1.4945570
摘要

The utilization of lignocelluloses for biogas production is limited for several aspects, and an efficient pre-treatment is essential to increase the enzyme accessibility of cellulose. This research focused on the mechanism of biogas production and biodegradation properties under the treatments with different acid agents, including sulfuric acid (H2SO4), acetic acid (CH3COOH), and phosphoric acid (H3PO4). The H3PO4 pretreated corn stover was then co-digested with cow dung in a pilot test to investigate the performance of acid pretreatment in practice. The results showed that the main compositions of corn stover were cellulose, hemicellulose, and lignin, and their proportions in the corn stovers were increased after the acid pretreatments. This hence increased the final biogas yields (up to 40.75%), methane content, and promoted the biodegradation process. More significantly, the acid pretreatments delayed the appearance of the peak value of the biogas yield for 3 to 8 days depending on the acid concentrations. This study proposed that the dilute weak acid pretreatment, especially H3PO4 pretreatment, efficiently enhanced the biogas production by increasing the degradation of hemicellulose. Further on, the H3PO4 pretreatment also improved the stability of fermentation, which would benefit the biogas generation in practice. This research contributes to a better understanding of the mechanism of acid influence on enhancing the biogas generation and substrate biodegradation, and provides pratically sound guidance for reclamation of lignocellulosic materials.
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