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Table 2

Relative abundance of bacteria involved in sulfide and methane oxidation detected by 16S rRNA gene amplicon sequencing in the bioreactors

Abundance of bacteria (%)/phase (HRT)R-control
R-air
Biomass
Sludge
Biomass
Sludge
6 h3 h6 h3 h6 h3 h6 h3 h
Sulfur bacteria 0.58 3.15 0.88 7.2 0.82 5.18 1.28 0.73 
Non-sulfur bacteriaa 64.92 69.95 35.54 17.67 62.84 40.28 11.02 48.25 
Sulfate-reducing bacteria 0.19 0.10 0.20 1.68 0.14 1.69 0.33 0.17 
Methanotrophic bacteria 1.2 0.42 0.64 0.14 2.18 0.20 0.14 0.05 
Abundance of bacteria (%)/phase (HRT)R-control
R-air
Biomass
Sludge
Biomass
Sludge
6 h3 h6 h3 h6 h3 h6 h3 h
Sulfur bacteria 0.58 3.15 0.88 7.2 0.82 5.18 1.28 0.73 
Non-sulfur bacteriaa 64.92 69.95 35.54 17.67 62.84 40.28 11.02 48.25 
Sulfate-reducing bacteria 0.19 0.10 0.20 1.68 0.14 1.69 0.33 0.17 
Methanotrophic bacteria 1.2 0.42 0.64 0.14 2.18 0.20 0.14 0.05 

aThis group comprises of sequences of phototrophic bacteria, including genera involved in sulfur oxidation (Garcia et al. 2017), organic acids and COD removal (Kim et al. 2004).

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