Combined Application of Coagulation/Flocculation/Sedimentation and Membrane Separation for the Treatment of Laundry Wastewater

Table 8

Performance of the MF and UF membranes in the experiments with different transmembrane pressures (batch 2).

Parameter	Feed	MF (% removal)			UF (% removal)
		0.6 bar	1.0 bar	1.4 bar	0.6 bar	1.0 bar	1.4 bar
Color (mgPt-Co·L^−1)	113.0 ± 1.4	93	94	98	88	88	90
TOC (mg·C·L^−1)	53.1 ± 1.4	37.2	53	42	52.6	47.3	56.6
COD (mg·O2·L^−1)	219 ± 8	73	73	77	52	67	92
Total nitrogen (mg·TN·L^−1)	6.9 ± 0	36.1	45.5	44.6	38	43.5	40.1
TDS (mg·L^−1)	431 ± 6	8.4	43.7	49.5	27.1	47.4	50.5
Surfactants (mg L^−1 MBAS)	9.5 ± 1	5.8	8.9	5.8	27.8	30.9	36.1
Turbidity (NTU)	11.9 ± 0.1	95	97	97	91	93	96
pH	6.4	6.8	6.8	6.6	6.8	6.8	6.9
Mean flux (L·h^−1·m^−2)	—	53.9 ± 0.3	71.5 ± 0.3	92.2 ± 0.5	7.3 ± 0.2	8.9 ± 0.1	12.5 ± 0.1
Fouling (%)	—	55.3	59.4	60.2	73.1	77.4	76.7

Mean fluxes obtained between 90 and 110 min (MF) and between 50 and 110 min (UF). Characteristics of the wastewater after the C/F/S process.