Bridging the GAPs: Approaches to Treating Water On Farms

Table 1. Effects of air temperature on ozone stability

Temperature (°F)

Half-life (days)

41

1.7

50

1.5

60

1.3

68

1.1

77

0.97

McClurkin, J.D. and D.E. Maier, 2010

In addition, water temperature plays an important role in the solubility of the ozone gas. The higher the water temperature, the lower its half-life or effectiveness, as shown in Table 2.

Table 2. Water temperature impact on ozone decay

Temperature (°F)

Half-life (min)

59

30

68

20

77

15

86

12

95

8

Gardoni et al., 2012

For ozone, a pH of 8.5 or lower is typical with a pH of 7.0 recommended. As organic matter increases the reaction time increases and the half-life of the ozone decreases. Inorganic matter can positively influence the reaction rate of ozone by acting as a scavenger for hydroxyl radicals. So as the concentration of inorganic carbon increases, i.e., the concentration of scavenger hydroxy radicals increases and the decay of ozone decreases.

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