机械搅拌重组中试固体厌氧消化池的传质和微生物代谢

IF 6.7 Q1 ENGINEERING, ENVIRONMENTAL
Hongyi Lyu, Ruixiao Yan, Mengyi Wang, Tairan Liu, Suqi Li, Caiyun Yang and Yiqing Yao*, 
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引用次数: 0

摘要

机械搅拌是促进固体厌氧消化(SS-AD)的最有效方法。然而,由于实验的限制,目前对其质量和传热的理解是有限的。在这里,建立了两个100 L的SS-AD反应器:一个有机械搅拌,另一个没有机械搅拌。通过温度分布来研究传热;结合计算流体力学(CFD)和有效扩散系数(Deff)对传质过程进行验证。结合环境参数来确定传热传质对微环境的影响。结果表明,机械搅拌可使CH4的累计产率提高32.21%。传质对微环境和微生物群落分布的影响大于传热。在AD启动阶段,机械搅拌有利于微生物的均匀分散。它促进了底物的水解,同时降低了CH4产生峰阶段的产甲烷电位,这表明在接下来的产甲烷阶段需要较低的机械搅拌强度。对于这种情况,宏基因组分析证实了机械搅拌增强了微生物的流动性和环境适应性。然而,它限制了微生物DNA合成、核糖体和与微生物繁殖相关的功能,导致反应器的CH4生产潜力降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mechanical Stirring Restructures Mass Transfer and Microbial Metabolism in Pilot-Scale Solid-State Anaerobic Digesters

Mechanical Stirring Restructures Mass Transfer and Microbial Metabolism in Pilot-Scale Solid-State Anaerobic Digesters

Mechanical stirring is the most efficient method for enhancing solid-state anaerobic digestion (SS-AD). However, the current understanding of its mass and heat transfer is limited due to experimental constraints. Here, two 100 L SS-AD reactors were established: one with mechanical stirring and the other without. Temperature distributions were conducted to study heat transfer; computational fluid dynamics (CFD) was combined with the effective diffusion coefficient (Deff) to validate mass transfer. Environmental parameters were incorporated to determine the influence of heat and mass transfer on the microenvironment. The results revealed that the cumulative CH4 yield with mechanical stirring was increased by 32.21%. Mass transfer had a greater impact on the microenvironment and microbial communities’ distribution than heat transfer. During the start-up stage of AD, mechanical stirring facilitated the homogeneous dispersion of microorganisms. It promoted substrate hydrolysis, while reducing methanogenic potential on the peak CH4 production phase, indicating a lower intensity of mechanical stirring is required in the following methanogenesis stage. For this case, metagenome analysis confirmed that mechanical stirring enhanced microbial mobility and environmental adaptability. However, it limited microbial DNA synthesis, ribosome, and functions related to microbial reproduction, resulting in a reduction in the CH4 production potential of the reactor.

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来源期刊
ACS ES&T engineering
ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-
CiteScore
8.50
自引率
0.00%
发文量
0
期刊介绍: ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources. The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope. Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.
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