Comparative analysis of solar pasteurization versus solar disinfection for the treatment of harvested rainwater

BMC Microbiology

Table 2 Cation and metal ion concentrations of the untreated water samples and the corresponding SODIS treated water samples collected after 6 and 8 hrs compared to the recommended drinking water guidelines

Metal	Untreated	After 6 hrs (70 °C)	After 8 hrs (63 °C)	Untreated	After 6 hrs (89 °C)	After 8 hrs (86 °C)	SANS 241	DWAF	AWDG
Ti (μg/L)	0.51	0.53	0.32	0.09	0.12	0.13	-	-	-
Al (μg/L)	14.35	20.29	11.82	1.19	3.77	5.61	300	150	200
V (μg/L)	0.21	0.20	0.25	0.07	0.14	0.16	200	1000	-
Cr (μg/L)	0.06	0.04	0.06	0.12	0.12	0.13	100	50	50
Mn (μg/L)	3.31	3.24	3.09	1.09	15.30	13.59	100	50	500
Fe (μg/L)	571.26	729.71	645.39	112.60	1015.32	505.35	200	100	300
Co (μg/L)	0.03	0.04	0.03	0.05	0.14	0.13	500	-	-
Ni (μg/L)	0.26	0.25	0.15	0.54	0.46	0.44	150	-	20
Cu (μg/L)	3.09	2.35	9.72	1.00	1.10	1.50	1000	1000	2000
Zn (μg/L)	1.46	5.29	4.18	4.50	5.12	2.52	5000	3000	3000
As (μg/L)	0.45	0.54	0.50	0.38	0.64	0.52	10	10	10
Mo (μg/L)	<0.005	<0.005	<0.005	0.02	0.01	0.03	-	-	50
Cd (μg/L)	<0.004	<0.004	<0.004	0.00	0.00	0.00	5	5	2
Ba (μg/L)	3.79	3.75	2.93	98.05	99.33	89.68	-	-	2000
Pb (μg/L)	0.46	0.65	0.53	<0.006	0.10	0.16	20	10	10
Ca (mg/L)	2.86	2.84	2.88	4.83	4.83	4.83	150	32	-
K (mg/L)	0.35	0.38	0.40	0.49	0.49	0.47	50	50	-
Mg (mg/L)	0.35	0.36	0.37	0.45	0.44	0.46	70	30	-
Na (mg/L)	2.01	2.05	2.08	2.06	2.00	2.09	200	100	180
P (mg/L)	0.10	0.14	0.15	0.04	0.08	0.14	-	-	-

ISSN: 1471-2180