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Comparative process stability and efficiency of mesophilic and thermophilic anaerobic digestion.

机译：中温和嗜热厌氧消化的比较过程稳定性和效率。

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摘要

Mesophilic temperature regimes (30–40°C) have been adopted for anaerobic digestion, showing good operational performance for a long time. Recently, the thermophilic regimes (50–60°C) have also been adopted for anaerobic digestion showing several advantages, such as an increased destruction rate of organic solids and increased destruction of pathogenic organisms. However, the use of thermophilic anaerobic digestion has been limited because of some disadvantages like poor supernatant quality and poor process stability related to high propionate threshold concentrations, which caused the US EPA to exclude thermophilic anaerobic digestion as Processes to Further Reduce Pathogens (PFRP). The purpose of this research was to evaluate process stability and process efficiency of thermophilic anaerobic digestion by evaluating the key parameters of reactor configuration, microbial consortia proximity, and inorganic nutrient supplementation. For the sake of comparison, all experiments in this research were conducted at 55°C or 35°C. Stable pH, lower VFA, higher gas production, and stable VS removal of the non-mixed reactor configuration at both mesophilic and thermophilic temperatures showed well-balanced performance between acid producers and consumers. This implies the importance of microbial consortia proximity to enhance microbial scavenging of dissolved H2 concentrations to lower levels, improving the thermodynamic advantage of the process. Supplementing inorganic nutrients significantly reduced all VFA concentrations dramatically, except for propionate. In the case of the non-mixed reactor, propionate was also barely detected at both temperatures. Therefore, it turned out that microbial consortia proximity could solve the problem of thermophilic poor effluent quality. A proposed kinetic model for the effect of the distance between two syntrophic bacteria reasonably matched the real data in this study. An innovative process based upon an incorporation of rational concepts to enhance process stability and efficiency of anaerobic digestion, which is called Anaerobic Digestion Elutriated Phased Treatment (ADEPT), showed that this process could solve the problem of poor effluent quality in thermophilic anaerobic digestion while achieving greater stability. Additional experimental studies were conducted for the better understanding of anaerobic solubilization and start-up seed source of anaerobic sludge digestion.
机译：中温温度范围（30–40°C）已用于厌氧消化，长期显示出良好的运行性能。近来，厌氧消化也采用了高温状态（50–60°C），显示出一些优势，例如增加了有机固体的破坏率和增加了对病原生物的破坏。然而，由于某些缺点，例如上清液质量差和与丙酸阈值浓度高相关的较差的工艺稳定性，限制了嗜热厌氧消化的使用，这导致美国环保署将嗜热厌氧消化作为进一步减少病原体（PFRP）的过程。这项研究的目的是通过评估反应器配置，微生物团聚体接近性和无机营养补充的关键参数来评估嗜热厌氧消化的过程稳定性和过程效率。为了进行比较，本研究中的所有实验均在55°C或35°C下进行。在中温和嗜热温度下，非混合反应器配置的稳定的pH值，较低的VFA，较高的产气量和稳定的VS去除率，表明制酸者和使用者之间的性能平衡良好。这暗示了微生物聚生体邻近性对于将溶解的H 2 浓度的微生物清除能力降低至较低水平，提高该过程的热力学优势的重要性。补充无机养分可以显着降低所有VFA浓度，丙酸除外。在非混合反应器的情况下，在两个温度下也几乎没有检测到丙酸酯。因此，事实证明，微生物联盟的邻近性可以解决嗜热的流出物质量差的问题。拟议的动力学模型，以影响两个同食细菌之间的距离合理匹配本研究中的实际数据。一种基于合理概念的创新工艺，可提高工艺稳定性和厌氧消化效率，称为厌氧消化电分相处理（ADEPT），表明该工艺可以解决嗜热厌氧消化过程中出水水质差的问题。更大的稳定性。进行了其他实验研究，以更好地了解厌氧溶解和厌氧污泥消化的启动种子来源。

著录项

  • 作者

    Kim, Moonil.;

  • 作者单位

    Vanderbilt University.;

  • 授予单位 Vanderbilt University.;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

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