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Metabolic cross-feeding interactions modulate the dynamic community structure in microbial fuel cell under variable organic loading wastewaters

Fig 4

Simulated microbial growth rate and metabolic cross-feeding adaption under increasing organic concentration.

A, Microbial growth rates and B, exchange capacity fluxes () of sulfate-reducing bacteria (SRB), methanogens (MET), and sulfide-oxidizing bacteria (SOB) under increasing organic concentration. The fluxes of an exchange capacity across the increasing organic concentration range were normalized using min-max normalization. The first and second phases are separated by a dashed-blue line. The first phase is defined between 0.48 and 1.26 mmol for butyrate uptake rate and 0.77 to 1.10 mmol for acetate uptake rate. The second phase ranges from 1.37 to 3.61 and 1.15 to 2.09 mmol for butyrate and acetate uptake rates, respectively. Dashed-grey lines represent points of the organic concentration, equal to low organic loading condition (L-OLR) and high organic loading conditions (H-OLR). is exchange capacity flux of the metabolite i of microbial group k including SRB, MET, and SOB. Positive (+) and negative (-) normalized exchange capacity fluxes indicate metabolite secretion (+) and consumption (-) for microbial compartments.

doi: https://doi.org/10.1371/journal.pcbi.1012533.g004