咖啡废弃物的厌氧消化性能

发布时间：2022-01-21 10:21

　　咖啡作为全球最受欢迎的商品之一,在生产过程中产生了大量的废弃物,包括咖啡渣（SCG）、咖啡壳（CH）和咖啡羊皮纸壳（CP）等。然而,丢弃这些原料导致废物处理不当和环境污染等严重问题,因此寻找一种绿色环保的处理方法成为了研究的热点。采用厌氧消化技术处理咖啡废弃物不但可以解决这一问题,而且有助于生成生物质能源,具有显著的优势。此外,有机负荷（OL）、原料与接种物之比（F/I）和pH等是影响厌氧消化产甲烷性能的关键因素。因此,通过响应面法（RSM）分别确定了 SCG、CH和CP的最适厌氧消化条件。实验结果表明,在F/I为1.9、OL为28.5g VS/L、初始pH值为6.9的条件下,SCG的最高累积甲烷产量为253.3mL/g VS。对于CH而言,最适F/I、OL和pH 分别为 0.9,28.7g VS/L 和 7.7,而甲烷产量为 189.1mL/g VS。在 F/I为0.9、OL为28.7g VS/L和pH为7.7时,CP的累积甲烷产量为48.0 mL/g VS。随后,为提高SCG、CP和CH的生物降解率,开展了咖啡废弃物与禽畜粪便的共消化实验。结果发现,当SCG与鸡粪在1:1的比例下,... 

【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】：74 页

【学位级别】：硕士

【文章目录】：
学位论文数据集
摘要
ABSTRACT
Abbreviations
Chapter 1 Introduction
    1.1 World's energy situation
    1.2 Anaerobic digestion (AD) procedure
    1.3 Anaerobic co-digestion
    1.4 Factors that disturb AD process
        1.4.1 Temperature
        1.4.2 pH
        1.4.3 Nature of feedstock
        1.4.4 Annual coffee yield and manure production
    1.5 RSM method
    1.6 Objectives
Chapter 2 Experimental materials and methods
    2.1 Experiment material
    2.2 Experiment reagent
    2.3 Analytical methods and equipment
        2.3.1 Analytical methods
        2.3.2 Experiment equipment
    2.4 Calculation methods of methane production
    2.5 Kinetic analysis
    2.6 Maximum methane potential and biodegradability
    2.7 Results' processing and analysis
Chapter 3 Enhancement of methane production from coffee wastes byresponse surface method (RSM)
    3.1 Introduction
    3.2 Materials and Methods
        3.2.1 Substrates and Inoculum
    3.3 Response surface method (RSM) design
        3.3.1 Anaerobic digestion
        3.3.2 Analytical method
        3.3.3 Second-order polynomial Model analysis
        3.3.4 Theoretical maximum methane yield and biodegradability
        3.3.5 Statistical analysis
    3.4 Results and discussion
        3.4.1 Interpretation and evaluation of the RSM model
        3.4.2 Effect of organic loading, pH and F/I ratio on AD performance
        3.4.3 Optimization of methane production
        3.4.4 VFA, pH and process stability
        3.4.5 SEM analysis
    3.5 Conclusions
Chapter 4 Co-digestion of coffee wastes and manures for methane production
    4.1 Introduction
    4.2 Materials and methods
        4.2.1 Substrates and inoculums
        4.2.2 Analytical methods
        4.2.3 Co-digestion tests
        4.2.4 Theoretical maximum methane yield and biodegradability
        4.2.5 Synergistic effect index
        4.2.6 Kinetic model
    4.3 Results and discussion
        4.3.1 Characteristics of substrates and inoculums
        4.3.2 Carbon to nitrogen ratio of single substrates and mixtures
        4.3.3 SEM analysis
        4.3.4 Biogas generation
    4.4 Conclusions
Chapter 5 Conclusions
References
Acknowledgement
作者导师简介
附件



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