超声波预处理对秸秆发酵的影响  

The effect of ultrasound pretreatment on straw fermentation

作　　者：冯磊[1] 陈岩[1] 李润东[1] 

机构地区：[1]沈阳航空航天大学,辽宁省清洁能源联合重点实验室,辽宁沈阳110136

出　　处：《可再生能源》2013年第1期66-70,共5页Renewable Energy Resources

基　　金：国家“973”重点基础研究规划项目(2011CB201500);沈阳市科技计划项目(F10-133-6-00)

摘　　要：以秸秆为研究对象,在37℃条件下对不同的超声波强度和工作时间预处理的秸秆进行为期50 d的厌氧发酵试验,分析发酵过程中产气效率、累计产气量、pH值、CH4浓度等参数变化,并对秸秆微观结构进行电镜扫描,研究超声波预处理对秸秆微观结构的破坏以及厌氧发酵产气特性影响。试验结果表明:超声波预处理能提高秸秆发酵累计产气量和产气效率,平均单位日产气量由未经预处理的4.54 ml/(g.d)提高到经超声波处理后的6.86 ml/(g.d),提高了51.10%;超声波预处理对秸秆发酵pH无显著影响;沼气中平均甲烷浓度由未经预处理的43.83%提高到处理后的47.86%;最佳超声波预处理功率为225 W,处理时间为30 min。The anaerobic straw digestion experiments were carried out by different ultrasonic power and time pretreatment under 37 ℃ for 50 d. Gas production rate, pH value, CH4 content in fermentation process were analyzed, and the straw microstructure was analyzed by the scanning electron microscopy （SEM） to study the efficiency of ultrasonic pretreatment on straw microstructure and gas production rate.The results showed：ultrasonic pretreatment can improve the gas production rate and accumulative gas production of straw fermentation, the gas production rate was improved from 4.54 ml/（g· d） to 6.86 ml/（g· d）,increased 51.10% ;Ultrasonic pretreatment has no significant influence on pH;the content of methane in biogas increased from 43.83% to 47.86%;the optimal ultrasonic pretreatment condition is ultrasonic power 225 W, pretreatment time 30 min.

关 键 词：秸秆 超声波 预处理 发酵 

分 类 号：TK6[动力工程及工程热物理—生物能] TB559[理学—物理]