碱后处理对互花米草沼渣理化特性的影响研究

以互花米草厌氧发酵后的沼渣为原料,采用紫外扫描、FTIR、XRD、1H-NMR、13C-NMR和其他一些常规分析手段研究了5%NaOH溶液固态处理前后,互花米草沼渣的物质结构、物质组成以及水浸提液理化特性的变化.结果表明,经5%的NaOH溶液处理48 h后,互花米草沼渣的骨架结构并未受到破坏,只是某些官能团的结构受到破坏;碱处理后,互花米草沼渣中木质素碎片化,木质素的芳香环结构受到不同程度的破坏,但木质素含量稍有增加;碱处理破坏了互花米草沼渣中纤维素的结晶结构,形成可被厌氧微生物破坏的类似结晶区结构,结晶区的比例增加,纤维素相对含量增加;碱处理后,互花米草沼渣中羧酸盐破坏严重,沼渣中羧基碳含量降低,烷烃类物质也受到一定的破坏,半纤维素相对含量降低;碱处理后,互花米草沼渣中烷基碳和芳香碳含量均降低,烷氧碳含量增加,芳香度降低,表明碱处理后互花米草沼渣的脂肪族特性增强,可生物降解性能提高.

Effect of Alkaline Post-Treatment on Physicochemical Property of Digested Spartina alterniflora

Alkaline treatment is widely used for improving biogas production for lignocellulosic materials. This study was conducted to investigate the effect of alkaline treatment on physicochemical property of digested Spartina alterniflora (DSA). Fourier Transform Infrared Spectroscopy (FTIR), X-Ray diffraction patterns, proton Nuclear Magnetic Resonance Spectroscopy (¹H-NMR), solid-state ¹³C-NMR Spectroscopy and some general indicators were used to analyze changes of the lignocellulosic structure and composition of NaOH-treated digested Spartina alterniflora. The results showed that, after NaOH treatment, surface lignin and some carbohydrate were destructed into lignin fragment, organic acids and some other small molecular organic matter, but the skeleton structure of lignin and cellulose of DSA were not destructed significantly. The crystalline of cellulose of DSA was transferred into biodegradable forms and content of crystalline of DSA and cellulose were increased after NaOH treatment. The results of ¹³C-NMR showed that methyl (CH₃) and carboxylic C(COOH) groups of DSA were decomposed significantly.