摘要
中草药残渣(Chinese herb-extraction residues,CHER)是一种不易被微生物利用的固体有机废弃物,厌氧消化时微生物降解的木质素会对纤维素形成物理屏蔽,阻碍微生物胞外酶水解催化作用。可见木质素降解是水解酸化首要步骤,木质素最初裂解需要分子氧存在,未经过好氧处理的木质素几乎不能在厌氧环境下被微生物降解。为此将厌氧发酵分成两相,即首先对CHER中温好氧水解产酸发酵,之后产甲烷发酵试验。结果表明,好氧水解发酵运行24 h时两相发酵累积甲烷产量达到最大值,VS产甲烷率为198 m L CH4 g-1VS,最大日产甲烷量为696 m L CH4 day-1,与单相发酵相比总甲烷产量提高30.3%。
Lignocellulosic wastes such as Chinese herb-extraction residues（CHER） are not easily utilized by microorganisms owing to their physical shielding of cellulose and hinder microbial extracellular enzyme hydrolytic catalysis imparted by the non-digestible lignin. Obviously, degradation of lignin was the primary step of hydrolysis acidification. Lignin initial cleavage required the presence of molecular oxygen,without aerobic treatment lignin hardly degraded by microbes in anaerobic environment. Therefore,conducted anaerobic fermentation of CHER into two phase, that was per mesophilic aerobic hydrolysis fermentation before the methanogenic fermentation. The results showed that the maximum cumulative methane production, the methane yield was 198 m L CH4g-1VS and the maximum methane daily yield was697 m L CH4day-1when the mesophilic aerobic hydrolysis fermentation phase run 24 h, and a 30.3% total methane yield enhancement compare with single phase fermentation.
出处
《东北农业大学学报》
CAS
CSCD
北大核心
2015年第10期90-96,共7页
Journal of Northeast Agricultural University
基金
"十二五"国家科技支撑计划项目(2014BAD02B04)
关键词
中草药残渣(CHER)
厌氧消化
甲烷
两相发酵
Chinese herb-extraction residues（CHER）
anaerobic digestion
methane
two-phase fermentation
