Hexavalent Chromium Removal from Model Water and Car Shock Absorber Factory Effluent by Nanofiltration and Reverse Osmosis Membrane

Table 2

Transport parameters ( and ), diffusive flux and of hexavalent chromium in presence of different salts ( = 50 mg , = 50%, pH = 8, and θ = 25°C).

		C (mol L^−1)	(L h^−1 m^−2)	SD; (%)	(mg L^−1)	SD; (%)		SD; (%)		SD; (%)
KCl	NF-HL	0	5.09	0.17	4.195	0.095	0.916	0.04	0.7102	1.06
		0.001	24	0.30	4.889	0.094	0.903	0.017	1.4879	3.68
		0.01	28.17	0.06	5.088	0.01	0.901	6 10^−5	1.6384	2.65
		0.1	27.14	0.21	6.884	0.1	0.865	5 10^−6	1.7517	4.75
KCl	RO-SG	0	5.33	0.07	0.398	0.092	0.993	0.0095	0.168	0.06
		0.001	7.82	0.15	0.716	0.035	0.987	0.049	0.269	0.04
		0.01	7.80	0.01	0.801	0.01	0.985	0.1	0.267	1.09
		0.1	20.40	0.04	1.543	10^−4	0.976	0.152	0.545	0.09
KNO3	NF-HL	0	5.09	0.09	4.195	0.004	0.916	0.38	0.7102	0.003
		0.001	11.97	0.02	5.715	0.0014	0.886	0.01	1.0366	0.09
		0.01	24.91	0.18	5.963	0.098	0.885	0.03	1.5274	1.63
		0.1	47.17	0.08	8.081	0.02	0.848	0.1	2.5262	0.08
KNO3	RO-SG	0	5.33	0.07	0.398	0.0003	0.993	0.03	0.168	0.007
		0.001	6.43	0.09	0.402	0.0007	0.992	0.04	0.184	0.0034
		0.01	8.43	0.04	0.509	0.0004	0.990	0.08	0.249	0.002
		0.1	12.52	0.03	1.739	0.0013	0.968	0.01	0.388	0.09
K2SO4	NF-HL	0	5.09	0.08	4.195	0.015	0.916	4 10^−3	0.7102	0.008
		0.001	12.80	0.10	6.971	0.1	0.869	0.25	1.2333	0.001
		0.01	32.157	0.01	6.801	0.001	0.871	0.145	1.8242	0.001
		0.1	116.83	0.18	7.780	0.005	nd	nd	nd	nd
K2SO4	RO-SG	0	5.33	0.11	0.398	0.00023	0.993	0.049	0.168	1.78
		0.001	9.82	0.1	0.700	10^−4	0.986	0.01	0.314	1.02
		0.01	8.24	0.2	0.884	0.0005	0.982	0.07	0.293	0.008
		0.1	21.77	0.2	2.746	1.14 10^−5	0.957	0.23	0.652	0.09