UASB 反应器中硫酸盐生物还原过程中厌氧菌的竞争动态。

Competitive dynamics of anaerobes during long-term biological sulfate reduction process in a UASB reactor.

机构信息

Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410004, China; Department of Civil and Environmental Engineering, Department of Frontier Science for Advanced Environment, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Aoba-Ku, Sendai, Miyagi 980-8579, Japan.

Department of Civil and Environmental Engineering, Department of Frontier Science for Advanced Environment, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Aoba-Ku, Sendai, Miyagi 980-8579, Japan.

出版信息

Bioresour Technol. 2019 May;280:173-182. doi: 10.1016/j.biortech.2019.02.023. Epub 2019 Feb 5.

DOI:10.1016/j.biortech.2019.02.023

PMID:30771572

Abstract

To reveal the long-term competitive dynamics of anaerobes in anaerobic bioreactors with sulfate reduction, a comprehensive structured mathematical model was designed for an extension of the Anaerobic Digestion Model No. 1 (ADM1). Sulfate reduction bacteria (SRB) were categorized into acetogenic-likewise SRB (ASRB) and methanogenic-likewise SRB (MSRB). Experimental data from 329 days of continuous operation of a laboratory-scale upflow anaerobic sludge bed (UASB) reactor was used for model calibration and validation. Results show that the model has a good agreement with experimental data and that three stages including the MPA dominant, stalemate and SRB dominant stages were clearly appeared throughout the whole competition period. The model was capable of predicting the long-term dynamic competition of sulfidogens and methanogens for electrons. This could explain a long-term of over 200 days needed for the SRB out-competing the MPA, and support speculation that the SRB could finally out-compete both the AcB and the MPA.

摘要

为了揭示硫酸盐还原条件下厌氧生物反应器中厌氧菌的长期竞争动态，设计了一个全面的结构化数学模型，用于扩展厌氧消化模型 1（ADM1）。硫酸盐还原菌（SRB）被分为产乙酸相似 SRB（ASRB）和产甲烷相似 SRB（MSRB）。使用实验室规模上流式厌氧污泥床（UASB）反应器连续运行 329 天的实验数据对模型进行了校准和验证。结果表明，该模型与实验数据吻合较好，整个竞争期明显出现了三个阶段，包括 MPA 主导阶段、僵持阶段和 SRB 主导阶段。该模型能够预测硫化物还原菌和产甲烷菌对电子的长期动态竞争。这可以解释为什么 SRB 要花 200 多天的时间才能战胜 MPA，并且支持这样一种推测，即 SRB 最终可能会战胜 AcB 和 MPA。