玉米秸秆厌氧产氢工艺参数优化  

Parameter optimization of hydrogen production by anaerobic fermentation with corn straw

作　　者：罗娟[1] 田宜水[1] 宋成军[1] 齐岳[1] 王骥[1] 赵立欣[1] 

机构地区：[1]农业部规划设计研究院,农业部农业废弃物能源化利用重点实验室,北京100125

出　　处：《农业工程学报》2015年第2期235-240,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：农业部农业废弃物能源化利用重点实验室开放课题(KLERUAR2013-01)

摘　　要：为解决玉米秸秆结构致密导致秸秆发酵难于直接降解的问题,首先分别采用0.2%、0.4%、0.6%、0.8%的HCl溶液对其进行预处理,以厌氧活性污泥为接种物进行中温(38℃)发酵产氢试验。结果表明,玉米秸秆的累积产氢量和产氢速率随着盐酸质量分数的增大先增加后降低,0.6%HCl处理效果最佳,单位累积产氢量和产氢速率分别为87.90 m L/g和3.05 m L/(g·h)。再以0.6%HCl溶液预处理的玉米秸秆为底物进行发酵产氢的单因素和正交试验,研究了秸秆粒径、底物浓度、初始p H值对玉米秸秆厌氧发酵产氢过程的影响。结果表明:玉米秸秆粒径越小越利于发酵产氢;适度增加底物浓度可增加产氢量;适宜的发酵初始p H值有利于产氢细菌的生长繁殖;得到较佳的工艺参数组合为秸秆粒径150μm、底物浓度15 g/L、初始p H值为7,此时累积产氢量为112.87 m L/g。Energy crisis and environmental pollution make it necessary to find an alternative energy source that is environmentally friendly and renewable. Hydrogen is generally considered as a clean and renewable energy. There are many hydrogen production methods in physical, chemical and biological ways. Hydrogen production from agricultural waste by anaerobic fermentation can not only solve the disposal of agricultural waste, but also obtain clean and efficient energy. This approach achieves the reduction of agricultural waste and resource’s harmless utilization with easy operation and low cost, and it is considered to be one of the best and most promising methods of hydrogen production. In this paper, according to the characteristics of corn straw, i.e., compact structure and being difficult to directly degrade, the effect of pretreatment methods on the hydrogen production from corn straw was studied. In the first place, the corn straw was soaked in hydrochloric acid （HCl） solution of 0.2%, 0.4%, 0.6% and 0.8% at room temperature for 24 h, and then the hydrogen production experiments were taken under the warm fermentation condition （38℃） and the anaerobic activated sludge was used as the inoculum. The results showed that the cumulative hydrogen production and hydrogen production rate of corn straw increased firstly and then decreased with the increase of HCl concentration; 0.6% HCl pretreatment had the best performance： cumulative hydrogen production per unit was 87.90 mL/g, 155% more than the corn straw without pretreatment, and the hydrogen production rate was 3.05 mL/（g.h）. Furthermore, different concentrations of HCl had little effect on the hydrogen concentration of gas produced by corn straw fermentation. Next, in the condition of （38±2）℃, single factor anaerobic fermentation test and orthogonal anaerobic fermentation test were carried out to investigate the effects of straw particle size, substrate concentration and initial pH value on hydrogen production process, using corn straw pretrea

关 键 词：秸秆 发酵 优化 制氢 

分 类 号：S216.2[农业科学—农业机械化工程]