CaO预处理提高玉米秸秆厌氧消化产沼气性能  

CaO pretreatment improve biogas production performance of corn straw

作　　者：罗娟[1,2] 张玉华[1] 陈羚[1] 宋成军[1] 李小刚[1] 齐岳[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 [2]北京化工大学环境科学与工程系,北京100029

出　　处：《农业工程学报》2013年第15期192-199,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划课题(2011BAD15B02)

摘　　要：为探索CaO预处理方法对玉米秸秆厌氧消化产沼气的影响,采用了3种不同质量百分数的CaO分别在3种不同处理时间下对玉米秸秆进行预处理,并在中温条件下进行了厌氧消化试验。试验结果表明,经过CaO预处理后,玉米秸秆的组分被不同程度破坏,厌氧消化产沼气能力有较大提高,厌氧消化时间有所缩短。综合日产气量、累积产气量、厌氧消化时间等各项参数来看,以5%CaO预处理3d的处理效果最佳,与未经预处理的效果相比,累积产气量提高了136.85%,消化时间缩短了5d,总固体(TS)和挥发性固体(VS)去除率分别提高了21.72%和7.18%,综合效果要优于其他处理组,有效地提高了玉米秸秆厌氧消化的产气量和产气效率。Due to the dense materials - hemicellulose, cellulose and lignin which were difficult to degrade in the crop straws, the anaerobic decomposition couldn’t decompose and utilize the crop straw quickly and efficiently. Appropriate pretreatments were needed to promote the efficiency of crop straw digestion. Lots of studies at home and abroad had shown that alkali pretreatment of crop straw had many advantages, such as having short processing time, good gas production and so on. To improve the gas production ability meanwhile reduce costs and security risks, relatively low cost and high security CaO was chosen as the pretreating agent in this study. Corn straws were pretreated by three different weight percentages （3%, 5% and 7%） of CaO retting for three different time （three days, five days and seven days） in an incubator chamber at （25±1）℃, and the effects with different conditions of CaO pretreatment on anaerobic digestion of corn straws for variation of components and anaerobic digestion performance （under temperature of （38±2）℃） were studied. A control set with untreated corn straws was also done to compare the difference with the treated ones. The experiments were set up in triplicate. The results showed that having been pretreated by CaO, the total content of hemicellulose, cellulose and lignin in corn straws was decreased, and the daily gas production and cumulative gas production got a substantial increase compared with the control. In addition, the starting time and digestion time was shortened significantly. The cellulose degradation effect of 5% and 3% of CaO with 3 days and 5% of CaO with 7 days were better in these nine pretreatments, and the degradation rates were 60.67%, 44.12% and 39.28%, respectively. The cumulative biogas production of 5% and 3% of CaO with 3 days were higher than others, and their unit dry mass gas production were 381.87mL/g and 369.00mL/g, which were 136.85% and 128.91% higher than the control. The digestion time of 80%of maximum gas production of all t

关 键 词：厌氧消化 沼气 玉米秸秆 CaO预处理 

分 类 号：S216.4[农业科学—农业机械化工程] X712[农业科学—农业工程]