| 厨余垃圾半连续干式厌氧发酵的影响因素研究 |
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| 引用本文： | 赵丽雅,林佩茹,郑义,王攀,任连海.厨余垃圾半连续干式厌氧发酵的影响因素研究[J].环境工程,2022,40(11):120-126. |
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| 作者姓名： | 赵丽雅 林佩茹 郑义 王攀 任连海 |
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| 作者单位： | 北京工商大学 生态环境学院 国家环境保护食品链污染防治重点实验室, 北京 100048 |
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| 基金项目： | 国家重点研发计划"固废资源化"重点专项（2019YFC1906303）；国家自然科学基金（42007350）；北京市自然科学基金（8202010）；2022年研究生科研能力提升计划项目（202202） |
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| 摘 要： | 探究了半连续干式厌氧发酵过程中有机负荷（organic loading rate，OLR）、搅拌速率和物料停留时间对甲烷产量的影响；并采用结构方程模型探究调控因素与厌氧体系中间产物和甲烷产量的动态变化。结果表明:提高OLR至5.5 g VS/（L·d）时，产甲烷效果最佳，平均日甲烷产量达到3084.40 mL/（L·d）。提高搅拌速率和物料停留时间可促进甲烷产生，但过低或过高的停留时间会导致NH4+-N和VFAs积累并抑制厌氧产甲烷过程；综合考虑，搅拌速率为20 r/min，停留时间为1 d最有利于甲烷的生成。结构方程模型结果显示:在厨余垃圾半连续干式厌氧发酵过程中，搅拌速率和物料停留时间对甲烷产量的影响大于OLR，其标准总效应分别为0.435、0.370和-0.04，这主要是由于提高搅拌速率有效缓解了干式厌氧发酵中VFAs对甲烷产量的抑制效应。
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| 关 键 词： | 干式厌氧发酵 厨余垃圾 甲烷产量 结构方程模型 |
| 收稿时间： | 2021-12-17 |
INFLUENCING FACTORS OF SEMI-CONTINUOUS DRY ANAEROBIC FERMENTATION OF KITCHEN WASTE |
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| Affiliation: | State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China |
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| Abstract: | The study investigated the effects of organic loading rate (OLR), stirring rate and material retention time on methane production in semi-continuous dry anaerobic fermentation, and used a structural equation model to discuss the dynamics of the regulating factors on the intermediate products and methane production in the anaerobic system. The results showed that when the OLR was increased to 5.5 g VS/(L·d), the methane production reached the peak, and the average daily methane production reached 3084.40 mL/(L·d). Increasing the stirring rate and material retention time could promote methane production, but a lower or higher material retention time led to the accumulation of NH4+-N and VFAs, and inhibited the anaerobic methanogenesis process. The stirring rate of 20 r/min and solid retention time of 1 d were synthetically considered as the most favorable condition for methane synthesis. The structural equation model results revealed that the influence of stirring rate and material retention time on methane production in semi-continuous dry anaerobic fermentation of kitchen waste was greater than that of OLR, and the standardized total effect were 0.435, 0.370 and -0.04, respectively, mainly because the rise of stirring rate effectively relieved the inhibition effect of VFAs on methane production in dry anaerobic fermentation. |
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