| 王振旗,张敏,沈根祥,王晨,钱晓雍,倪远之,张心良.不同黄贮预处理对水稻秸秆干法厌氧发酵特性的影响[J].农业环境科学学报,2021,40(4):894-901. |
| 不同黄贮预处理对水稻秸秆干法厌氧发酵特性的影响 |
| Effects of different yellow-storage pretreatments on the dry anaerobic digestion characteristics of rice straw |
| 投稿时间：2020-09-21 |
| DOI：10.11654/jaes.2020-1100 |
| 中文关键词: 水稻秸秆 干法厌氧发酵 预处理 碳氮比（C/N） 产气量 |
| 英文关键词: rice straw dry anaerobic digestion pretreatment carbon-nitrogen ratio(C/N) biogas production |
| 基金项目:上海市科委“科技创新行动计划”项目（19DZ1204801）；上海市重大环保科研项目（沪环科[2015]第8号，沪环科[2020]第10号） |
|
| 摘要点击次数: 1606 |
| 全文下载次数: 1386 |
| 中文摘要: |
| 针对长三角水源区高C/N水稻秸秆干法厌氧发酵产气效率低的问题，利用自制全自动不锈钢发酵罐装置，探索了不同黄贮预处理技术对厌氧发酵效率的影响，并从预处理前后物料结构变化与降解效果方面对秸秆产沼机理进行了初探。结果表明，在发酵物料C/N为50的条件下，8 mg·L-1 Ca（OH）2的稀碱处理组和稀释20倍沼液的微生物处理组产气效果最佳，单位干物质产气量分别达407 L·kg-1 VS与397 L·kg-1 VS，总产气量分别是对照组的1.64倍和1.59倍，可以达到最佳C/N条件下的80%~115%，表明适宜的预处理方式可在一定程度上解决因氮源不足造成的产气效率低下问题。两种预处理方式均可使水稻秸秆表面蜡质层、颗粒物与丝状物分解，进而提高纤维素类物质降解效率。研究表明，稀碱预处理可缓冲发酵前期酸化对产气的抑制作用，沼液处理组可显著提高发酵初期沼气中的甲烷含量，但所需预处理时间相对较长，约为稀碱预处理的4倍，工程应用中可根据实际需求选择适合的预处理方式。 |
| 英文摘要: |
| The aim of this study was to improve the biogas production efficiency of rice straw in a dry anaerobic digestion system with a high C/N ratio in a water source reservoir area in the Yangtze River Delta, using a self-made automatic stainless-steel digester. We explored the effects of different yellow-storage pretreatments on the dry anaerobic digestion efficiency, change in feed structure, and rice straw degradation. Results showed that at a C/N ratio of 50, the diluted alkaline pretreatment with 8 mg·L-1 Ca(OH) 2 and microbial pretreatment with 20-times diluted biogas slurry gave the highest biogas yields of 407 L·kg-1 VS and 397 L·kg-1 VS(dry matter), respectively. These were 1.64 times and 1.59 times higher than the yields of CK, respectively, and achieved 80%~115% of the yield generated under optimal C/N conditions. Our results indicated that appropriate pretreatment options could eliminate the inefficiency resulting from insufficient nitrogen sources. Both pretreatment methods improved the cellulose degradation efficiency by decomposing the wax layer, particulate, and filamentous matter on the rice straw surface. The results indicated that diluted alkaline pretreatment buffered the inhibition effects of acidification on gas production, while slurry treatment significantly increased the methane content of biogas at the initial stage of digestion. However, pretreatment duration using the microbial method with slurry was 4 times longer than that of the diluted alkaline method. Therefore, under engineering conditions, the choice of pretreatment option should be guided by actual needs. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
