Pretreatment of vinasse from the sugar refinery industry under non-sterile conditions by Trametes versicolor in a fluidized bed bioreactor and its effect when coupled to an UASB reactor

Table 3 Characterization of influent and effluent in systems 1 and 2

	System 1		System 2
Parameter	Vinasse (diluted 7% v/v)	UASB effluent	Vinasse (diluted 10% v/v)	Fluidized bed bioreactor effluent	UASB effluent
COD	7,704 ± 800	4,000 ± 570^a	11,000 ± 1,000	7,000 ± 93	3,940 ± 42^a
Phenolic compounds	758 ± 100	840 ± 42^a	1,083 ± 150	460 ± 40	519 ± 10^b
Color*	0.10 ± .001	0.11 ± 0.003^a	0.13 ± 0.012	0.13 ± 0.003	0.14 ± 0.005^b
SO₄ ^2-	371 ± 90	200 ± 56^a	530 ± 141	540 ± 50	70 ± 40^b
TN	120 ± 15	723 ± 52^a	172 ± 21	688 ± 79	408 ± 91^b
N-NH₃	5 ± 0.6	57 ± 1^a	7 ± 1	5 ± 0.7	31 ± 4^b
PO₄ ^3-	29 ± 5	49 ± 6^a	41 ± 7	22 ± 2	46 ± 7^a
Biogas production**	-	2,370 ± 149^a	-	-	1,102 ± 83^b
Methane content***	-	65 ± 5^a	-	-	74 ± 6^b

All values are expressed in mg/L, * Color is the absorbance at 475 nm, ** Biogas production at mL, *** Methane content at percentage. Each value is a mean ± SD. Different case letters indicate significant difference between means of UASB effluent in System 1 and System 2 for each parameter (One-way ANOVA, multiple range test, P < 0.05)

ISSN: 1754-1611