Environmental Engineering Reference
In-Depth Information
water puriied with ZZ meets the requirements set by the WHO guidelines and the Cuban
standard NC 827: 2010 [13,14].
A 100 g load of ZZ allows the puriication of 150 L of water. Throughout the process, the
zinc content in the treated water does not increase above 3 ppm (mg/L) as observed in
Figure 30.11, i.e., well under the Cuban 5 ppm standard, which is the value recommended
by the WHO [10].
The study of the pitcher with ZZ cartridge (140 g) using home tap water reproduced the
exchange of Zn
2+
by Ca
2+
as observed in Figure 30.12. The calcium content was reduced by
25% as compared with the initial value in tap water.
2.5
2.0
1.5
1.0
0.5
0.0
0
50
100
150
200
Volume (L)
FIGURE 30.11
Zn content in drinking water treated with the ZZ puriication system.
Ca
Zn
100
80
60
4
3
2
1
0
0
100
200
Drinking water volume treated with ZZ (L)
FIGURE 30.12
Zinc and calcium content in tap water treated in the ZZ pitcher.
