| 基于微好氧同步预升温的序批式厌氧干发酵特性 |
| |
| 引用本文： | 于佳动, 刘新鑫, 赵立欣, 冯 晶, 陈建坤, 郭占斌. 基于微好氧同步预升温的序批式厌氧干发酵特性[J]. 农业工程学报, 2020, 36(10): 213-219. DOI: 10.11975/j.issn.1002-6819.2020.10.026 |
| |
| 作者姓名： | 于佳动 刘新鑫 赵立欣 冯晶 陈建坤 郭占斌 |
| |
| 作者单位： | 1.黑龙江八一农垦大学工程学院，大庆 163319;2.农业农村部规划设计研究院农村能源与环保研究所，农业农村部农业废弃物能源化利用重点实验室，北京 100125;3.中国农业科学院农业环境与可持续发展研究所，北京 100081 |
| |
| 基金项目： | 现代农业产业技术体系专项资金资助（CARS-02）；农业农村部规划设计研究院自主研发项目（ZZYFCGPY201901） |
| |
| 摘 要： | 序批式厌氧干发酵是规模化处理农业农村废弃物生产清洁能源的重要技术，存在物料分解速率低、运行能耗高、传质传热不均匀等突出问题，制约甲烷产率的提高。该研究通过调节发酵初期反应器溶氧浓度，建立微好氧同步预升温高效序批式厌氧干发酵体系，进一步研究微好氧状态下物料自升温、分解、中间产物性质，以及关键微生物群落对促进物料升温及甲烷生产的作用机制。结果表明：微好氧环境使物料升温速率提高27.12%，产甲烷过程不依靠外源加热温度仍可保持在42.48 ℃以上。发酵初始阶段的少量曝气使厌氧发酵过程中间产物转化效率显著提升（P<0.05），特别是丙酸积累含量下降了82.63%，累积沼气和甲烷产量分别提高了56.76%和41.79%。细菌Bacteroidales、Clostridiales和古菌Methanosarcina、Methanobacterium有利于促进微好氧同步预升温和甲烷生产效率提升，并与降解率和有机酸浓度具有显著的相关性。该研究可为探索序批式厌氧干发酵实际工程高效调控工艺提供理论基础。
|
| 关 键 词： | 发酵 温度 农业废弃物 微好氧 |
| 收稿时间： | 2020-03-03 |
| 修稿时间： | 2020-04-30 |
Characteristics of sequencing batch dry anaerobic fermentation with microaerobic preheating |
| |
| Yu Jiadong, Liu Xinxin, Zhao Lixin, Feng Jing, Chen Jiankun, Guo Zhanbin. Characteristics of sequencing batch dry anaerobic fermentation with microaerobic preheating[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2020, 36(10): 213-219. DOI: 10.11975/j.issn.1002-6819.2020.10.026 |
| |
| Authors: | Yu Jiadong Liu Xinxin Zhao Lixin Feng Jing Chen Jiankun Guo Zhanbin |
| |
| Affiliation: | 1.College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China;2.Center of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering MARA, Key Laboratory of Energy Resource Utilization from Agriculture Residue MARA, Beijing 100125, China;3.Institute of Environmental and Sustainable Development in Agriculture, CAAS, Beijing 100081, China |
| |
| Abstract: | China is a big agricultural country,which produces a lot of agricultural waste every year.With the improvement of China’s agricultural productivity,agricultural wastes such as straw and livestock manure are relatively concentrated,which creates appropriate conditions for the application of sequencing batch dry anaerobic digestion(SBD-AD)technology to produce methane.Sequential batch anaerobic dry fermentation is an important technology for large-scale processing of agricultural and rural wastes to produce clean energy.It has such outstanding problems as low decomposition rate of materials,high operating energy consumption,and uneven mass and heat transfer,which limit the increase in methane yield.In this study,by adjusting the dissolved oxygen concentration in the initial reactor of the fermentation,a microaerobic simultaneous pre-heating and efficient sequential batch anaerobic dry fermentation system was established to further study the self-heating,decomposition,intermediate product properties and key microbial communities.The mechanism of promoting material heating and methane production.The results show that the micro-aerobic speeds up the heating rate of the materials in the reactor,which is 27.12%higher than the un-aerated temperature;the temperature of methanogenesis can be maintained above 42.48℃without relying on external heating.A small amount of aeration in the initial stage of fermentation significantly improved the conversion efficiency of intermediate products in the anaerobic fermentation process(P<0.05).The lignocellulose degradation rate was increased by 57.88%-85.53%compared with the non-aerated group;the sCOD concentration was increased by 74.67%compared with the non-aerated group.The concentration of ammonia nitrogen in the non-aeration group is increased by 31.95%compared with the micro-aeration group,and micro-aeration increases the conversion efficiency of ammonia nitrogen;in particular,the accumulation of propionic acid decreased by 82.63%.The concentration was consumed by 285 mg/L on the 33rd day,and the system pH value was always maintained at 6.8-7.5.After 7 days of micro-aeration,the cumulative biogas production gap gradually increased,and the methane output of the micro-aeration group increased rapidly.On the 5th to 15th days,it was a rapid period of methane production.Overall,the cumulative methane content in the aeration group was 1.5 tines of the non-aeration group after 60 days of fermentation,the cumulative biogas and methane production increased by 56.76%and 41.79%,respectively.Bacteria Bacteroidales,Clostridiales and archaea Methanosarcina,Methanobacterium are conducive to promoting microaerobic simultaneous pre-heating and methane production efficiency,and have a significant correlation with degradation rate and organic acid concentration.This study provides a theoretical basis for exploring the efficient engineering control process of the sequential batch anaerobic dry fermentation. |
| |
| Keywords: | agricultural waste formentation temperature microaerobic |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《农业工程学报》浏览原始摘要信息 |
|
点击此处可从《农业工程学报》下载全文 |
|
