Competitive dynamics of anaerobes during long-term biological sulfate reduction process in a UASB reactor
Competitive dynamics of anaerobes during long-term biological sulfate reduction process in a UASB reactor
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DOI：
10.1016/j.biortech.2019.02.023
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发表时间：
2019-05-01
影响因子：
11.4
通讯作者：
Yasui, Hidenari
中科院分区：
文献类型：
--
作者：
Chen, Hong;Wu, Jiang;Yasui, Hidenari
为了揭示硫酸盐还原厌氧反应器中厌氧微生物的长期竞争动力学，设计了一个全面的结构化数学模型，用于扩展厌氧消化1号模型（ADM 1）。硫酸盐还原菌（SRB）分为产乙酸-类似SRB（ASRB）和产甲烷-类似SRB（MSRB）。利用实验室规模的上流式厌氧污泥床（UASB）反应器连续运行329天的实验数据，对模型进行了标定和验证。结果表明，该模型与实验数据吻合较好，在整个竞争过程中，MPA占优势、相持阶段和SRB占优势3个阶段明显存在。该模型能够预测产硫菌和产甲烷菌对电子的长期动态竞争。这可以解释SRB需要超过200天的长期竞争力，并支持SRB最终可能超过AcB和MPA的猜测。
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.