Table 2 Relative abundance of methanogens and bacteria at family/genus level (>1% relative abundance) in the single-phase, hydrolytic-acidogenic and methanogenic reactors.

From: Potential and optimization of two-phase anaerobic digestion of oil refinery waste activated sludge and microbial community study

Phylum

Class

Genus/family

Single-phase

Aacidogenic phase

Methano-genic phase

Euryarchaeota

Methanomicrobia

 

8.1%

6.2%

17.6%

  

Methanoregula

3.9%

2.7%

1.0%

  

Methanosaeta

0.1%

0.3%

8.2%

  

Methanoculleus

3.2%

1.7%

1.9%

  

Methanosarcina

0.2%

0.2%

5.8%

  

Methanospirillum

0.4%

1.1%

0.7%

Firmicutes

Clostridia

 

11.6%

23.7%

35.5%

  

Caloramator

5.8%

15.1%

0.7%

  

Anaerobranca

0.2%

0.2%

6.1%

 

Bacilli

 

1.3%

7.5%

0.4%

  

Ureibacillus

0.1%

5.3%

0.2%

  

Bacillus

0.8%

1.8%

0.2%

 

Erysipelotrichi

RFN20

0.6%

0.2%

2.1%

Proteobacteria

Betaproteobacteria

 

11.6%

17.7%

3.6%

  

Petrobacter

0.3%

4.3%

1.8%

  

Dechloromonas

1.6%

2.7%

1.0%

 

Gammaproteo-bacteria

 

7.9%

4.9%

2.2%

  

Pseudomonadaceae

2.7%

2.3%

0.2%

  

Halomonadaceae

1.5%

0.1%

0.0%

Bacteridetes

Bacteroidia

 

20.6%

15.3%

27.4%

  

Porphyromonadaceae

1.3%

0.8%

24.5%

  

Bacteroidaceae

11.7%

10.0%

2.2%

Spirochaetes

Spirochaetes

 

3.1%

3.6%

0.3%

  

Treponema

2.8%

3.3%

0.2%

Chloroflexi

Anaerolineae

T78

2.3%

4.5%

1.2%

others

  

32.9%

16.4%

9.7%