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Table 2 Summary of the 16S rRNA gene sequencing data and α-diversity values in the fermentation cultures

From: Changes in the microbial consortium during dark hydrogen fermentation in a bioelectrochemical system increases methane production during a two-stage process

 

BES

MF (← BES)

NBES

MF (← NBES)

MF

Cathode

Anode

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

4

Read count

303,658

254,520

195,455

360,162

429,089

139,885

369,111

379,933

108,290

336,686

405,213

135,923

300,358

273,447

131,346

330,753

Observed OTUs

721

549

552

760

592

456

1767

1590

1012

757

396

328

1325

1326

900

1039

Chao1

1005

829

831

1019

837

726

2347

2141

1625

994

531

522

1829

1920

1462

1382

Shannon index

3.41

2.67

3.11

3.42

2.54

3.07

5.52

5.36

5.15

3.93

1.88

2.66

5.68

5.58

5.54

4.52

Simpson index

0.83

0.71

0.80

0.84

0.69

0.80

0.96

0.95

0.91

0.88

0.54

0.76

0.96

0.96

0.96

0.88

  1. The fermentation cultures were obtained from the BES (cathodic and anodic sides), NBES, subsequent MFs (← BES and ← NBES), and single MF. The α-diversity values included Chao1, Shannon index, and Simpson index. The numbers 1, 2, and 3, indicate the hydraulic retention time (HRT) and pH of the substrate (pHin) in the first stage for the two-stage process as follows; 1: 4 days and 6.5, 2: 2 days and 6.5, and 3: 2 days and 7.3. The number 4 indicates the HRT (4 days) and pHin (7.7) in the single-stage MF