温度对木质纤维素水解与挥发性脂肪酸累积的影响

Effect of temperature on lignocellulosic wastes hydrolysis and volatile fatty acids accumulation

木质纤维素厌氧消化过程产生的挥发性脂肪酸（VFAs）可作为外加碳源投加到人工湿地，解决人工湿地反硝化碳源不足的问题，但温度对木质纤维素厌氧消化生产VFAs过程的影响还有待深入探明。考察上述木质纤维素厌氧消化过程中有机碳源、糖与VFAs的变化规律，试图探明温度（10-55℃）对木质纤维素水解与VFAs累积的影响。研究结果表明，温度升高对木质纤维素的水解具有促进作用，对VFAs产量的影响显著。35℃时是生物质发酵产酸的最优条件，VFAs累积量不仅最早（第10天）达到最高值154mgCOD／g生物质，而且碳源的数量和品质均达到较高的水平。

Despite that volatile fatty acids （VFAs） produced in the anaerobic digestion process of lignocel- lulosic wastes can be used as external carbon source to enhance the denitrification efficiency in constructed wet- lands, the effects of temperature on producing VFAs using lignocellulosic wastes as raw material remain unclear. In this work, the variation of organic carbon sources, sugar and VFAs during the fermentation process of lignocel- lulosic wastes was examined to explore the effects of temperature （10 -55℃ ） on lignocellulosic wastes hydrolysis and VFAs accumulation. The results showed that the hydrolysis of lignocellulosic wastes was accelerated and the production of VFAs changed significantly as the temperature increased. At 35℃ , the accumulation of VFAs reached the maximum value of 154 mg COD/g biomass at the soonest （ 10 d） , and both the quantity and quality of the carbon sources achieved a higher level. So, 35℃ could be considered as the optimal conditions for VFAs accumulation in this study.