Table 3. Removal of sulfide in the effluent from SRR by Alcaligenes sp. T307.

Parameter (mg L^-1)*

Sterile optimized wastewater
(SOW: pure culture)

Raw optimized wastewater
(ROW: mixed cultures)

0 hr

20 hrs

0 hr

20 hrs

BOD

503 ± 12

483 ± 10

553 ± 15

575 ± 17

COD

2500 ± 24

1533 ± 18

2450 ± 21

1533 ± 15

BOD/COD

0.20 ± 0.003

0.32 ± 0.003

0.23 ± 0.004

0.38 ± 0.007

VFAs

222 ± 8.6

194 ± 7.6

210 ± 7.3

103 ± 5.6

pH

6.96 ± 0.18

8.29 ± 0.21

6.97 ± 0.15

8.52 ± 0.22

Viable cells
(cfu ml^-1)

8.41 ± 0.21

9.02 ± 0.24

8.16 ± 0.19

8.96 ± 0.22

Total sulfide

19.6 ± 1.4

1.6 ± 0.14 (91.84%)

18.9 ± 1.2

8.27 ± 0.32 (56.24%)

Dissolved sulfide

8.27 ± 0.7

0.93 ± 0.08 (88.75%)

8.27 ± 0.5

5.6 ± 0.13 (32.29%)

Hydrogen sulfide

1.18 ± 0.11

0.05 ± 0.001
(95.76%)

1.14 ± 0.09

0.09 ± 0.002 (92.11%)

Sulfate

498 ± 9.5

487 ± 8.7

485 ± 7.9

491 ± 8.5