Furthermore, Figure 2(f) shows the design of a portable system intended for emergency areas lacking safe drinking water [15], and for bacterial disinfection using solar energy with a photocatalyst developed by us [14] shown in Figure 2(g). The system demonstrated water disinfection efficiencies of four orders of magnitude under laboratory conditions after 30 min of treatment, as it is shown in Figure 2(h) [15], and with real water under field conditions, Figure 2(i), disinfection was achieved in less than 15 minutes [14], this was because the bacteria concentration was 3480 CFU/mL, at least three orders of magnitude less than under laboratory conditions. ` (c) (d ) (h) (i) (g) (f) (a) (b) (e) Before after
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