褐煤酸碱预处理-微生物气化联产H_2-CH_4的实验研究

Experimental study on the production of H_2-CH_4 from lignite jointly with acid-alkali pretreatment-microbial gasification

为探讨酸、碱处理煤的发酵联产生物气生成特征,对新疆伊宁矿区褐煤进行酸、碱预处理,以焦作古汉山矿井水为菌源进行发酵联产H_2-CH_4实验。对联产后的产气量、气体组分、HPE活性、COD质量浓度进行测定分析,对产气后煤样进行XRD和红外测试。结果发现:(1)碱处理煤的产氢效果最佳,产气总量为20.25 mL/g,酸处理煤次之为17.05 mL/g,而原煤的产氢效果最差为14.4 mL/g;(2)HPE活性测定规律基本与之对应,碱处理煤产氢后菌体的氢化酶活性最优为4.35 mL/(mg·min);(3)酸处理煤的联产甲烷效果最好,产气总量为23.35 mL/g,而原煤和碱处理煤的联产甲烷效果基本一致;(4)联产中液相COD质量浓度均呈下降状态;(5)经预处理煤样的有机质降解率高,大分子结构更易被降解。实验结果得出了预处理煤联产生物气的生成特征,证实了联产H_2-CH_4有利于煤的资源化利用,明显提升了能源转化率。

In order to investigate the characteristics of the production of biogenic gas from lignite with acid-alkali pretreatment,the authors carried out the fermentation experiments of hydrogen and methane production by using cultured bacteria from coal seam water in Guhanshan coal mine,as well as acid and alkali pretreatment of lignite in Yining Mine,Xinjiang.The authors measured gas production,gas components,activity of hydrogenase,COD concentration,and tested XRD and FTIR for coals after gas production.The results show that：（1） The hydrogen production of coal with alkali pretreatment is the highest with the total gas production by 20. 25 m L/g,the coal with acid pretreatment is17. 05 m L/g,and the lowest hydrogen production of raw coal is 14.4 m L/g;（2） The determination of HPE is basically corresponding to it,and the hydrogenase activity of hydrogen production from coal with alkali pretreatment is 4. 35 m L/（ mg·min）;（3） Methane production of coal from acid pretreatment is the best,and the total gas productionis 23.35 m L/g,while the effect of raw coal and the coal with alkali pretreatment is similar;（4） The concentration of COD in the combined production shows a decrease;（5） The organic matter degradation rate of pretreated coal sample is higher,and the macromolecular structure is more easily degraded.The results show the fermentative biogas characteristics of pretreated coal,and it proves that the combined production of H_2-CH_4 is beneficial to the utilization of coal,which obviously improves the energy conversion rate.