Table 3. Values of the parameters used in the experimental period.

Phase I

Phase II

Phase III

Phase IV

Low rate

High rate

High rate + additive

High rate as in phase II

 Duration (d)

Days 1 - 16

Days 17 - 40

Days 41 - 64

Days 65 - 90

 Bv (g COD l^-1 d^-1)

GCC^a

1.4 - 1.6

2.0 - 2.2

2.0 - 2.2

2.0 - 2.2

UASB

1.4 - 1.5

2.0 - 2.5

2.0 - 2.2

2.0 - 2.2

 HRT (h)

GCC

61 - 65^b
9.7 - 10.4^c

42 - 45^b
6.2 - 6.4^c

42 - 45^b
6.2 - 6.4^c

42 - 45^b
6.2 - 6.4^c

UASB

10.5 - 11.0

6.5 - 7.0

6.5 - 7.0

6.5 - 7.0

 Additive

No

No

Yes

No