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乔玮,姜萌萌,赵婧,Wandera S.M,董仁杰.中温和高温环境下乙酸和丙酸厌氧发酵产甲烷动力学特征[J].农业工程学报,2018,34(21):234-238.DOI:10.11975/j.issn.1002-6819.2018.21.029
中温和高温环境下乙酸和丙酸厌氧发酵产甲烷动力学特征
投稿时间:2018-06-02  修订日期:2018-09-08
中文关键词:  甲烷  动力学  温度  厌氧发酵  乙酸  丙酸
基金项目:“十三五”国家重点研发计划课题(2016YFD0501403);国家自然科学基金课题(51778616、51408599);北京市自然科学基金(6182017)
作者单位
乔玮 1. 中国农业大学工学院北京 1000832. 国家能源生物燃气高效制备及综合利用技术研发(实验)中心北京 100083 
姜萌萌 1. 中国农业大学工学院北京 1000832. 国家能源生物燃气高效制备及综合利用技术研发(实验)中心北京 100083 
赵婧 1. 中国农业大学工学院北京 1000834. 荷兰格罗宁根大学科学与工程学院9747 AG格罗宁根 
Wandera S.M 1. 中国农业大学工学院北京 1000832. 国家能源生物燃气高效制备及综合利用技术研发(实验)中心北京 100083 
董仁杰 1. 中国农业大学工学院北京 1000832. 国家能源生物燃气高效制备及综合利用技术研发(实验)中心北京 1000833. 中国农业大学烟台研究院烟台 264670 
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中文摘要:采用不同浓度的乙酸和丙酸在中高温下进行厌氧发酵批次试验,采用修正的Gompertz模型和产甲烷的一级动力学模型分析,研究酸浓度和温度对发酵产气动力学的影响。研究表明,当乙酸和丙酸浓度较低时降解较快,高浓度酸抑制产气。乙酸在中温条件下降解较快,质量浓度为5 000 mg/L时中温反应有最大产甲烷速率101 mL/d;质量浓度为10 000 mg/L时高温条件下有最大产甲烷速率77 mL/d,随酸浓度增加,最大产甲烷速率减小,高温反应器对酸的耐受度较高。丙酸在高温条件下更易降解,浓度为4 000 mg/L时,中高温反应均有最大产气速率:78 mL/d(中温)和96 mL/d(高温)。另外,高浓度乙酸和丙酸厌氧降解产气具有滞后性,且随酸浓度的增加滞后期延长,降解过程受到抑制,一级动力学常数减小。温度对厌氧降解的影响大于酸浓度对厌氧降解的影响。
Qiao Wei,Jiang Mengmeng,Zhao Jing,Wandera S.M,Dong Renjie ※.Methanogenesis kinetics of anaerobic digestion of acetate and propionate at mesophilic and thermophilic conditions[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(21):234-238.DOI:10.11975/j.issn.1002-6819.2018.21.029
Methanogenesis kinetics of anaerobic digestion of acetate and propionate at mesophilic and thermophilic conditions
Author NameAffiliation
Qiao Wei 1. College of Engineering, China Agricultural University, Beijing 100083, China
2. R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls) Beijing 100083, China
 
Jiang Mengmeng 1. College of Engineering, China Agricultural University, Beijing 100083, China
2. R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls) Beijing 100083, China
 
Zhao Jing 1. College of Engineering, China Agricultural University, Beijing 100083, China
4. Faculty of Science and Engineering, University of Groningen, Groningen, 9747 AG The Netherlands 
Wandera S.M 1. College of Engineering, China Agricultural University, Beijing 100083, China
2. R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls) Beijing 100083, China
 
Dong Renjie ※ 1. College of Engineering, China Agricultural University, Beijing 100083, China
2. R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls) Beijing 100083, China
3. Institute of Yantai, China Agricultural University, Yantai 264670, China
 
Key words:methane  kinetics  temperature  anaerobic digestion  acetate  propionate
Abstract: During anaerobic fermentation is strongly influenced by temperature and volatile fatty acids (VFAs). When the temperature in anaerobic reactors is too high, the VFAs are easy to accumulate, especially acetate and propionate. High VFAs will inhibit the activity of methanogens, the fermentation process as well as the methane yield will become unstable even make the anaerobic system failed. In order to investigate the ability of adapting different concentration of acids and temperature, batch experiments with different concentrations of acetate and propionate were carried out at both mesophilic and thermophilic conditions. Modified Gompertz model and first order model were used to analyze the methane production kinetics. The inoculum was got from coffee mate anaerobic digestion, because coffee mate contains 2% protein, 34% fat and 56% carbohydrates, which can simulate the real ingredients in anaerobic fermentation. The concentrations of acetate acid were set for 0, 2 000, 5 000, 10 000 and 20 000 mg/L; and the concentrations of propionate were set for 0, 500, 1 000, 2 000, 4 000 and 8 000 mg/L. In addition, sodium hydroxide was used to adjust the pH value in a range of 7.2-7.6 in every batch bottle, and every concentration had 3 parallels to ensure the veracity of this experiment. The result showed that both of acetate and propionate degradation faster at the lower concentration. Acetate was easily degraded at mesophilic condition, when the concentration of acetate was 5 000 mg/L; mesophilic reactors had the maximum methane production rate which was 101 mL/d, while the thermophilic reactor had the maximum methane production rate which was 77 mL/d when the acetate concentration was 10 000 mg/L. With the acid concentration increasing, methane production rate decreased and the thermophilic reactor had a higher tolerance for the acetate concentration. In contrast, propionate was easily decomposed under the thermophilic condition and the lag phase under mesophilic was greatly affected by the acid concentration; when the propionate concentration increased from 500 to 4 000 mg/L, the lag phase doubled under the mesophilic condition while a half fold increase under the thermophilic condition. The maximum methane production rate was 96 mL/d when the concentration of propionate was 4 000 mg/L, while the maximum methane production rate under mesophilic condition was 75 mL/d when the concentration of propionate was 4 000 mg/L as well. The lag phase of gas production was longer at higher acid concentration, while the first-order kinetic constants reduced. In addition, the degradation rate constant of both mesophilic and thermophilic under same acid condition showed that the effect of temperature on anaerobic degradation is greater than that of acid concentration to some extent.
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