玉米秸秆与废弃白菜的混合青贮品质及产沼气能力分析
发布时间：2018-10-23 10:35
【摘要】：为实现干玉米秸秆(dried maize straw,DMS)的长时间保质贮存,利用青贮原理将DMS与废弃白菜(cabbage waste,CW)连续混贮90 d,设置DMS单贮组和6个不同质量比例(DMS:CW=29:19、27:21、25:23、23:25、21:27和19:29)混贮组,间隔30 d分析其贮存品质,筛选适宜贮存条件,并考察秸秆贮存前后的微观结构变化和产沼气潜力。结果表明,与单贮组相比,6个混贮组的p H值均显著下降(P0.05),乳酸含量显著升高(P0.05),混贮品质优于单贮。6个混贮组贮存30 d时的p H值均为最低,乳酸含量最高,感官评价均为优级,30 d后p H值有所上升,乳酸含量急剧下降,60d时的木质素含量显著降低(P0.05),综纤维素含量显著升高(P0.05)。随着CW比例增加,混贮组p H值逐渐减小,乳酸含量逐渐增加,MEⅤ组(DMS:CW=21:27)p H值最低,乳酸含量最高,能使DMS连续贮存60 d不变质。扫描电镜结果显示,青贮发酵使干秸秆原先致密复杂的木质纤维结构开始瓦解,青贮秸秆表面有很多裂缝和孔洞,与微生物或酶的可接触面积增加。沼气发酵试验表明,MEⅤ组混贮秸秆的累积产气量略高于未贮存干秸秆,且累积甲烷产量提高了61.67%,是未贮存干秸秆的1.6倍。Modified Gompertz模型显示混贮秸秆的甲烷生成速率增加,产甲烷能力提高。总之,当DMS∶CW质量比为21∶27(含水率为73%)时DMS能连续保质贮存2月,且贮存后秸秆的甲烷产量明显提升。
[Abstract]:In order to realize long time storage of dry corn straw (dried maize straw,DMS, DMS and abandoned cabbage (cabbage waste,CW) were continuously mixed for 90 days by silage principle. The storage quality was analyzed by setting DMS single storage group and six mixed groups with different mass ratio (DMS:CW=29:19,27:21,25:23,23:25,21:27 and 19:29). The optimum storage conditions were screened, and the microstructure changes and biogas potential of straw before and after storage were investigated. The results showed that compared with the single storage group, the pH value of the six mixed groups decreased significantly (P0.05), the content of lactic acid increased significantly (P0.05), the quality of the mixed storage was better than that of the single storage group, the pH value of the six mixed groups was the lowest and the lactic acid content was the highest after 30 days of storage. Sensory evaluation was excellent. After 30 days, pH value increased, lactic acid content decreased sharply, lignin content decreased significantly at 60 days (P0.05), and holocellulose content increased significantly (P0.05). With the increase of CW ratio, pH value and lactic acid content of mixed storage group gradually decreased, and ME 鈪，
本文编号：2288982
[Abstract]:In order to realize long time storage of dry corn straw (dried maize straw,DMS, DMS and abandoned cabbage (cabbage waste,CW) were continuously mixed for 90 days by silage principle. The storage quality was analyzed by setting DMS single storage group and six mixed groups with different mass ratio (DMS:CW=29:19,27:21,25:23,23:25,21:27 and 19:29). The optimum storage conditions were screened, and the microstructure changes and biogas potential of straw before and after storage were investigated. The results showed that compared with the single storage group, the pH value of the six mixed groups decreased significantly (P0.05), the content of lactic acid increased significantly (P0.05), the quality of the mixed storage was better than that of the single storage group, the pH value of the six mixed groups was the lowest and the lactic acid content was the highest after 30 days of storage. Sensory evaluation was excellent. After 30 days, pH value increased, lactic acid content decreased sharply, lignin content decreased significantly at 60 days (P0.05), and holocellulose content increased significantly (P0.05). With the increase of CW ratio, pH value and lactic acid content of mixed storage group gradually decreased, and ME 鈪，
本文编号：2288982
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