添加磁铁矿和载体以缓解厌氧消化过程氨氮抑制的探究

发布时间：2022-01-10 07:39

　　在厌氧消化过程中,氨氮是最主要的氮源,对微生物的生长有重要作用。但是,高浓度的氨氮会对能量转换效率和运行稳定性有抑制作用。本论文意在更好地理解高氨氮浓度下添加矿石和载体对厌氧消化过程的影响,为缓解高氨氮抑制问题寻找合理的解决途径。本文首先筛选出对厌氧消化产甲烷过程有促进效果的矿物和载体。而后对添加矿物和载体的反应器进行长期运行的评价。最后,阐明了添加矿物和载体对微生物群落的影响。（1）采用磁铁矿、褐锰矿、活性炭、热解碳、沸石、载体进行间歇实验。同时添加磁铁矿和载体的反应器内,甲烷产量最高,约为373.24 mL CH4/g Glu,同时迟滞期时间较短,少于1天（0.77天）,而且产甲烷速率较快,λ=78.26 mL CH4/葡萄糖/d。在加入载体的反应器（约46.21 mg/L）以及同时加入磁铁矿和载体的反应器（约65.8 mg/L）中,均出现挥发性脂肪酸的积累。总氨浓度的结果表明,不同矿物和载体对氨氮的吸收量有一定的阈值。在添加了磁铁矿或褐锰矿的反应器中,可溶性铁没有显著差异,说明可溶性铁不是影响反应器性能的关键因素。同时加入磁铁矿和载体的反应器中,以乙酸盐、甲酸盐和H2/CO2为底... 

【文章来源】：北京化工大学北京市 211工程院校 教育部直属院校

【文章页数】：105 页

【学位级别】：硕士

【文章目录】：
学位论文数据集
ABSTRACT
摘要
List of Abbreviations
Chapter 1: Introduction
    1.1 Energy shortage and Chemical waste/wastewater treatment status
        1.1.1 Energy shortage
        1.1.2 Chemical wastewater/wastes
        1.1.3 Strategies to deal with wastes
    1.2 Anaerobic digestion
        1.2.1 Hydrolysis
        1.2.2 Acidogenesis
        1.2.3 Acetogenesis
        1.2.4 Methanogenesis
    1.3 Parameters affecting the anaerobic digestion
        1.3.1 pH value
        1.3.2 Temperature
        1.3.3 Salt concentration
        1.3.4 Organic loading
    1.4 Ammonia inhibition in anaerobic digestion
        1.4.1 Identification of ammonia equilibria and free ammonia concentration
        1.4.2 Mechanism of ammonia inhibition to methanogenesis
        1.4.3 Strategies to alleviate ammonia inhibition during anaerobic digestionprocess
    1.5 Research objective and significance
    1.6 Research content and route
Chapter 2: Experimental setup
    2.1 Experimental materials
    2.2 Experimental design and procedure
    2.3 Analytical methods
        2.3.1 Biogas compositions
        2.3.2 Volatile fatty acids analysis
        2.3.3 pH value
        2.3.4 Total ammonia nitrogen test
        2.3.5 Chemical oxygen demand analysis
        2.3.6 Fe soluble
        2.3.7 Carbohydrate concentration
        2.3.8 Specific methanogenic activity test
        2.3.9 Microbial community analysis
    2.4 Data analysis
Chapter 3. Mineral and carrier selection and process evaluation in anaerobic digestionprocess
    3.1 Introduction
    3.2 Batch experimental procedures
    3.3 Results and discussion
        3.3.1 Cumulative methane production
        3.3.2 Volatile fatty acids concentration
        3.3.3 Soluble Fe
        3.3.4 Total ammonia nitrogen concentration
        3.3.5 Specific methanogenic activity
    3.4 Chapter summary
Chapter 4. Long-term evaluation and microbial community of media and carriersaddition to alleviate ammonia inhibition
    4.1 Introduction
    4.2 Anaerobic fed-batch experimental procedures
    4.3 Results and discussion
        4.3.1 Methane production
        4.3.2 Volatile fatty acids concentration
        4.3.3 pH value
        4.3.4 Chemical oxygen demand removal efficiently
        4.3.5 Carbohydrate degradation
        4.3.6 Specific methanogenic activity
        4.3.7 2-bromoethanesulfonate addition
        4.3.8 Microbial community
            4.3.8.1 Archaea community
            4.3.8.2 Bacterial community
    4.4 Chapter summary
Conclusion
Innovations
References
Acknowledgements
List of publications
Introduction of the Author and Supervisor
附件



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