Energetic and biochemical valorization of cork boiling wastewater by anaerobic digestion

Table 2 Characterization of CBW reported in the literature

Parameter	Acero et al.[15]	Benítez et al.[22]	Bernardo et al.[6]	Benítez et al.[7]	Dias-Machado et al.[20]	Vilar et al.[17]	Mendonça et al.[21]	Santos et al.[28]
pH	4.8	5.4	4.7 to 5.1	4.7	4.7 to 5.7	7.5	4.8 to 5.1	4.6 to 6.2
COD (kg m^-3)	1.6	1.9	2.29 to 2.60	4.29	2.3 to 4.6	4.7	7.4	2.26 to 11.50
BOD₅ (kg m^-3)	0.75	1.15	0.875 to 0.90	1.75	0.49 to 0.74	0.75	1.3	0.5 to 3.5
TOC (kg m^-3)	-	-	0.671 to 1.57	-	1.2 to 2.0	-	-	1.2 to 2.0
TS (kg m^-3)	-	-	-	-	-	-	-	1.1 to 1.5
VS (kg m^-3)	-	-		-	-	-	-	0.85 to 1.0
TSS (kg m^-3)	0.12	-	-	0.28	-	0.124	-	-
VSS (kg m^-3)	-	-	-	-	-	0.102	-	-
Conductivity (mS cm^-1)	-	-	0.934 to 0.935	-	-	2.9	-	1.40 to 1.64
Total phenols (kg m^-3)	0.305^b	0.29^b	0.36 to 0.41^c	-	0.66 to 0.78^e	0.74^f	1.3^g	(^a)
Tannins (kg m^-3)	-	-	0.25 to 0.27^d	0.761	-	-	-	-
Total nitrogen (kg m^-3)	-	-	-	-	-	0.31	-	0.06 to 0.2
Toxicity (UT)	-	-	-	-	-	-	3.4 to 12.3	-

^aPhenolic content as C₆H₅OH (0.2 to 0.6 kg m^-3), phenolic content as caffeic acid (0.48 to 0.58 kg m^-3), polyphenolic content as gallic acid (1.0 to 3.5 kg m^-3) and tannins as tannic acid (0.85 to 1.70 kg m^-3); ^btotal phenols as caffeic acid; ^ctotal phenols as tannic acid; ^dtannins as tannic acid; ^epolyphenol content; ^fpolyphenols as caffeic acid; ^glignin and tannin. BOD₅, biological oxygen demand of 5 days; CBW, cork boiling wastewater; COD, chemical oxygen demand; TOC, total organic carbon; TS, total solids; TSS, total suspended solids; VS, volatile solids VSS, volatile suspended solids.

ISSN: 2731-3654