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于佳动,赵立欣,冯晶,姚宗路,黄开明,罗娟,魏世萌.喷淋次数和接种量对序批式秸秆牛粪混合干发酵产气性能的影响[J].农业工程学报,2018,34(21):228-233.DOI:10.11975/j.issn.1002-6819.2018.21.028
喷淋次数和接种量对序批式秸秆牛粪混合干发酵产气性能的影响
投稿时间:2018-06-22  修订日期:2018-09-14
中文关键词:  秸秆  甲烷  水解  序批式干法厌氧发酵  喷淋次数  接种量
基金项目:现代农业产业技术体系专项资金资助(CARS-02);中国博士后科学基金资助项目(2017M620717)
作者单位
于佳动 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 
赵立欣 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 
冯晶 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 
姚宗路 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 
黄开明 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 
罗娟 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 
魏世萌 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 
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中文摘要:序批式干法厌氧发酵产沼气技术可明显提高有机废弃物处理能力,但在提高以秸秆为主的农业废弃物发酵效率核心工艺及产气性能方面还缺乏系统的研究。该文通过调节喷淋次数和接种量研究了以玉米秸秆为主要原料的序批式干法厌氧发酵产气性能,并通过模型拟合、水解产物分析等手段揭示了影响水解和甲烷生产的制约因素。结果表明,调节喷淋次数和接种量均对沼气产量具有显著性影响(P<0.05)。喷淋次数为4次/d,接种量不低于质量分数20%时,沼气产量最大为251.6 L/kg。而且,产气高峰期甲烷体积分数平均为55%左右。增加接种量、提高喷淋次数可有效促进底物的水解。但是,甲烷产量、最大产甲烷率却呈现先增加后降低的趋势,并明显受到有机酸(丙酸)、氨氮积累浓度的制约,水解产物高效转化对提高产气效率具有重要作用。该研究可为改善秸秆序批式干法厌氧发酵工艺优化提供理论指导。
Yu Jiadong,Zhao Lixin※,Feng Jing,Yao Zonglu,Huang Kaiming,Luo Juan,Wei Shimeng.Effect of spray times and inoculum content on biogas production performance of sequencing batch dry anaerobic digestion with mixed straw and cow dung[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(21):228-233.DOI:10.11975/j.issn.1002-6819.2018.21.028
Effect of spray times and inoculum content on biogas production performance of sequencing batch dry anaerobic digestion with mixed straw and cow dung
Author NameAffiliation
Yu Jiadong Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Zhao Lixin※ Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Feng Jing Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Yao Zonglu Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Huang Kaiming Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Luo Juan Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Wei Shimeng Center of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Beijing 100125, China 
Key words:straw  methane  hydrolysis  sequencing batch dry anaerobic digestion  spray times  inoculum content
Abstract: The Chinese large-scale biogas engineering is generally based on wet anaerobic fermentation technology, the solid content of feedstock is about 6%, but treating the high solid content of agricultural waste still have a series of problems. Using the sequencing batch dry anaerobic digestion technology (SBD-AD) for treating agricultural wastes not only increases the amount of feedstock, increases the volumetric biogas production rate, but also reduces the slurry production and the cost of post-treatment. A stable technical model has been formed in European Union countries. However, the development of the SBD-AD biogas engineering using agricultural wastes as feedstock in China is slow. Further research is needed to promote the efficiency of the SBD-AD according to the characteristics of local agricultural wastes, such as cornstalks and cow dung. Cornstalk is rich in lignocellulose, and it is difficult to digest. And no systematic research has been taken on the performance of the SBD-AD with straw as the main feedstock. Moreover, previous studies have shown that the spray times and inoculum content were the key factors affecting the methane production efficiency of the SBD-AD process. This paper studied the biogas production characteristics of SBD-AD using corn stalks as main feedstock by controlling spray time and inoculum content, and explored factors that affect the hydrolysis and methane production using methods of model fitting and hydrolysate analysis. The results showed that both of the spray times and inoculum content had significant effects on biogas production (P<0.05). Low (3 times per day) and high spray times (12 times per day) were not conducive to biogas production, and the inoculum content should not be less than 20%, and the most biogas yield reached 251.6 L/kg, when the spray times and inoculum content was 4 times/d and ≥20% (w/w),respectively. Moreover, the methane content was about 55% at the peak stage of biogas production and rapid decline after 20 day. Increasing the inoculum content and spray times could promote substrate hydrolysis efficiency ranging 20%-30%. However, the methane yield and the maximum methane production rate increased first and then decreased, it was limited obviously by the accumulation of organic acid, which the organic acid concentration reached 1 302-1 956 mg/L in the fermentation prophase, and propionic acid concentration accounts for 58.2%-79.9%. In addition, the system had inhibition risk of ammoniacal nitrogen (527.3 mg/L). The conversion efficient of hydrolysate played an important role in improving biogas production efficiency. This study can provide theoretical guidance for improving process optimization quality of SBD-AD based on straw waste.
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