高压脉冲电场对杂交狼尾草厌氧发酵沼气产气率的影响  

Effect of high-voltage pulsed electric field(HPEF) pretreatment on biogas production rates of hybrid Pennisetum by anaerobic fermentation

作　　者：王白娟[1] 陈婷[1] 秦向东[1,2] 吴奇[1] 赵艳[1] 白顺星 彭文[1] 冯博[1] 

机构地区：[1]云南农业大学 [2]云南省高校生物天然气产业化技术工程研究中心

出　　处：《天然气工业》2017年第7期132-138,共7页Natural Gas Industry

基　　金：国家自然科学基金项目(编号:61561054);云南省高校生物天然气产业化技术工程研究中心建设项目

摘　　要：为提高杂交狼尾草厌氧发酵的原料利用率及沼气产气率,采用不同条件下的高压脉冲电场(High Voltage Pulsed Electric Field,缩写为HPEF)对杂交狼尾草原料进行预处理,在中温(35℃)、TS质量分数6%、接种率20%、初始pH值为7.0的条件下,进行32 d厌氧消化试验。结果表明:(1)经HPEF预处理的9组杂交狼尾草厌氧发酵的产气效果均明显优于对照组,其累计产气量都比对照组高,日产气量的峰值及甲烷浓度的最大值也有所增加;(2)促进作用最显著的HPEF条件为15 kV/120 Hz/60min,其在32 d的发酵期间累计产气量达9 587 mL,与对照组相比增幅达26.95%,其日产气量峰值与高峰期范围也有所增加;发现HPEF的最佳处理时间为60 min,HPEF三参数对产气效果均有着较好的影响,影响程度大小排序为电压>时间>频率;(4)各处理参数对日产气量峰值的影响顺序依次为电压、频率、时间。结论认为:HPEF能够有效提高杂交狼尾草厌氧发酵的原料利用率及产气率、缩短产气周期,该物理手段的预处理方法充分实现了狼尾草的资源化利用,有效扩充了能源植物的种类。In this paper, the raw materials of hybrid Pennisetum was pretreated in different conditions of high voltage pulsed electric field （HPEF） to improve its material utilization ratios and biogas production rates of anaerobic fermentation. Then, anaerobic digestion experiments were conducted within 32 days at moderate temperature （35 ℃） with TS mass fraction （6%）, inoculation rate （20%） and initial pH （7.0）. It is indicated that compared with the control group, 9 groups of hybrid Pennisetum pretreated by HPEF are obviously superior in gas production efficiency of anaerobic fermentation, and higher in cumulative gas production, peak daily gas production and maximum methane concentration; that the most remarkable stimulation occurs in the HPEF condition of 15 kV/120 Hz/60 min, in that situation, the cumulative gas production in the fermentation period of 32 days is up to 9 587 mL, 26.95% higher than that of the control group, the peak daily gas production increases and the range of peak period extends. It is demonstrated that the optimal HPEF pretreatment time is 60 min and three HPEF parameters have a better effect on gas production in the order of voltage〉 time 〉 frequency; and that the effect degree of treatment parameters on peak daily gas production is voltage, frequency and time in turn. It is concluded that HPEF can improve mate- rial utilization ratio and gas production rate of hybrid Pennisetum by anaerobic fermentation and shorten the gas production cycle. By virtue of this physical pretreatment method, the resource of Pennisetum is utilized sufficiently and the classes of energy plants are enlarged effectively.

关 键 词：杂交狼尾草 厌氧发酵 高压脉冲电场(HPEF) 沼气 原料利用率 产气率 模型 促进作用 

分 类 号：S216.4[农业科学—农业机械化工程]