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

[Display omitted] •Extending ADM1 for sulfate reduction in a UASB with an influent COD/SO4 ratio of 1.•The mean relative error of the model in the MPR during the whole 329 days was 8.52%.•The model can predict the electron competition of sulfidogens and methanogens.•A long-term of over 200 days is c...

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Bibliographic Details
Published in:Bioresource technology 2019-05, Vol.280, p.173-182
Main Authors: Chen, Hong, Wu, Jiang, Liu, Bing, Li, Yu-you, Yasui, Hidenari
Format: Article
Language:English
Subjects:
ADM1
Competitive dynamics
Mathematical modelling
Methane-producing archaea
Sulfate reducing bacteria
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Summary:[Display omitted] •Extending ADM1 for sulfate reduction in a UASB with an influent COD/SO4 ratio of 1.•The mean relative error of the model in the MPR during the whole 329 days was 8.52%.•The model can predict the electron competition of sulfidogens and methanogens.•A long-term of over 200 days is confirmed for the SRB to out-competing the MPA.•A novel method for dynamic population changes of competitive anaerobes established. 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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2019.02.023