IWA Publishing

In the present study, the effect of influent concentration of Pb, Cd, and Zn was investigated using a synthetic solution containing 10, 50, and 100 mg/L of metal ions at optimised flow rate (2 mL/min) and bed height (2 cm). The breakthrough curves of Pb, Cd, and Zn are shown in Figure 1, and the values of the experimental breakthrough parameters are tabulated in Table 3.

Table 3

Parameters obtained from the breakthrough curves of the fixed-bed column

Metal	Influent metal concentration (mg/L)	Flow rate (mL/min)	Bed height (cm)	t_b (min)	t_e (min)	q_e (mg/g)	%R	MTZ (cm)
Pb	10	2	2	600	750	10.33	89	0.4
	50	2	2	270	420	23.34	72	0.71
	100	2	2	180	360	42.30	69	1.0
	50	1	2	540	750	24.06	86	0.56
	50	3	2	150	300	22.55	64	1.0
	50	2	4	450	660	24.68	82	1.27
	50	2	6	780	990	25.66	87	1.27
Cd	10	2	2	330	480	6.40	77	0.62
	50	2	2	150	300	15.05	64	1.0
	100	2	2	90	210	22.84	61	1.42
	50	1	2	330	510	16.70	78	0.70
	50	3	2	30	180	11.86	54	1.6
	50	2	4	360	540	19.38	78	1.33
	50	2	6	570	750	20.68	85	1.44
Zn	10	2	2	660	780	10.81	88	0.30
	50	2	2	270	390	23.03	76	0.61
	100	2	2	240	360	47.56	78	0.67
	50	1	2	570	750	25.79	84	0.48
	50	3	2	180	300	22.94	67	0.8
	50	2	4	510	660	25.19	86	0.91
	50	2	6	720	870	26.06	92	1.03

Metal	Influent metal concentration (mg/L)	Flow rate (mL/min)	Bed height (cm)	t_b (min)	t_e (min)	q_e (mg/g)	%R	MTZ (cm)
Pb	10	2	2	600	750	10.33	89	0.4
	50	2	2	270	420	23.34	72	0.71
	100	2	2	180	360	42.30	69	1.0
	50	1	2	540	750	24.06	86	0.56
	50	3	2	150	300	22.55	64	1.0
	50	2	4	450	660	24.68	82	1.27
	50	2	6	780	990	25.66	87	1.27
Cd	10	2	2	330	480	6.40	77	0.62
	50	2	2	150	300	15.05	64	1.0
	100	2	2	90	210	22.84	61	1.42
	50	1	2	330	510	16.70	78	0.70
	50	3	2	30	180	11.86	54	1.6
	50	2	4	360	540	19.38	78	1.33
	50	2	6	570	750	20.68	85	1.44
Zn	10	2	2	660	780	10.81	88	0.30
	50	2	2	270	390	23.03	76	0.61
	100	2	2	240	360	47.56	78	0.67
	50	1	2	570	750	25.79	84	0.48
	50	3	2	180	300	22.94	67	0.8
	50	2	4	510	660	25.19	86	0.91
	50	2	6	720	870	26.06	92	1.03

View Large

Figure 1

View large Download slide

Effect of the initial metal concentration on the breakthrough curves of (a) Pb, (b) Cd, and (c) Zn (flow rate, 2.0 mL/min; bed height, 2.0 cm; pH, 5 for Pb and 7 for Cd and Zn).

This Feature Is Available To Subscribers Only