Table 3 Methanogenesis reactor effluent stability indicator parameters values at different HRT and OLR

OLR (mg COD/L)

149

199

298

596

TVFA (mg/L)

541 ± 18

526 ± 45

520 ± 19

604 ± 26

TotA (mg/L)

1174 ± 45

1424 ± 63

1534 ± 11

1537 ± 78

TVFA:TotA ratio

0.46

0.35

0.36

0.39

Salinity (mg/L)

1172 ± 17

1311 ± 16

1172 ± 17

1224 ± 15

NH₄⁺-N (mg/L)

362 ± 10

372 ± 53

382 ± 53

400 ± 55

Effluent pH

6.91 ± 0.2

6.90 ± 0.2

6.92 ± 0.04

6.53 ± 0.1

ORP (mV)

− 82 ± 4

− 67 ± 3

− 80 ± 3

− 73 ± 6