Removal of Hardness of Earth Alkaline Metals from Aqueous Solutions by Ion Exchange Method

Table 5

((a), (b), and (c)) The exchange of pH of the solution in equilibrium depends on contact time with the resin according to experimental conditions.

(a)

Contact time with the resin (min)	0	10	20	30	40	50	60
pH; (resin dosage: 5.0 g); (stirring speed: 115 rpm)	2.00	1.77	1.74	1.73	1.72	1.72	1.72
pH; (resin dosage: 5.0 g); (stirring speed: 115 rpm)	3.00	2.03	1.98	1.96	1.95	1.94	1.93
pH; (resin dosage: 5.0 g); (stirring speed: 115 rpm)	4.00	2.22	2.18	2.17	2.16	2.14	2.11
pH; (resin dosage: 5.0 g); (stirring speed: 115 rpm)	5.00	2.35	2.29	2.27	2.25	2.20	2.11

(b)

Contact time with the resin (min)	0	10	20	30	40	50	60
pH; (resin dosage: 5.0 g); (stirring speed: 78 rpm)	3.00	2.84	2.25	2.23	2.22	2.21	2.21
pH; (resin dosage: 5.0 g); (stirring speed: 148 rpm)	3.00	2.18	2.17	2.17	2.16	2.16	2.14

(c)

Contact time with the resin (min)	0	10	20	30	40	50	60
pH; (resin dosage: 7.5 g); (stirring speed: 115 rpm)	3.03	2.05	2.04	2.03	2.02	2.02	2.01
pH; (resin dosage: 10.0 g); (stirring speed: 115 rpm)	3.02	2.00	1.95	1.93	1.92	1.91	1.91