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Designer Oxidizers for Industrial Cooling. Comparison of the Measured Residual vs. Dosage of ClO 2 with Cl 2 for a Heavily Contaminated Water. . Chlorine Dioxide - Chlorine.

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designer oxidizers for industrial cooling
Designer Oxidizers

for

Industrial Cooling

slide2

Comparison of the Measured Residual

vs.

Dosage of ClO2 with Cl2 for a Heavily Contaminated Water.

chlorine dioxide chlorine
Chlorine Dioxide - Chlorine

Table 9-8. C. parvum Inactivation Using Chlorine Dioxide Followed by Free Chlorine

Disinfectant Level of Inactivation (log-units)

pH 6.0 pH 8.0 pH 11.0

Chlorine dioxide 1 .0 1.4 1.6

Free chlorine 0 0 0

Chlorine dioxide followed by free chlorine 2.2 3.0 2.3

Inactivation attributed to synergism 1.2 1.6 0.7

Source: Finch, 1997.

Chlorine dioxide 1.3 mg/L for 120 minutes, free chlorine 2.0 mg/L for 120 minutes.

Table 9-9. G. muris Inactivation Using Chlorine Dioxide Followed by Free Chlorine

Disinfectant Level of Inactivation (log-units)

pH 6.0 pH 8.0

Chlorine dioxide 0.8 0.8

Free chlorine 0.8 0.6

Chlorine dioxide followed by free chlorine 2.2 2.0

Inactivation attributed to synergism 0.6 0.6

Source: Finch, 1997.

Chlorine dioxide: 1.0 mg/L for 10 minutes, free chlorine 2.0 mg/L for 30 minutes.

EPA Guidance Manual

Alternative Disinfectants and Oxidants

chlorine dioxide chloramine
Chlorine Dioxide-Chloramine

Table 9-11. C. parvum Inactivation Using Chlorine Dioxide Followed by Chloramine

Disinfectant Level of Inactivation (log-units)

pH 6.0 pH 8.0 pH 11.0

Chlorine dioxide 1.0 1.5 1.6

Monochloramine 0 0 0

Chlorine dioxide followed by monochloramine 2.2 2.8 2.1

Inactivation attributed to synergism 1.2 1.3 0.5

Source: Finch, 1997.

Chlorine dioxide: pH 6, 8, and 11: 1.3 mg/L for 120 minutes. Monochloramine: pH 6 and 11: 2.0 mg/L for 120 minutes, pH 8: 2.8

mg/L for 180 minutes.

Table 9-12. G. muris Inactivation Using Chlorine Dioxide Followed by Chloramine

Disinfectant Level of Inactivation (log-units)

pH 8.0 pH 11.0

Chlorine dioxide 0.8 0.8

Monochloramine 0.5 0.7

Chlorine dioxide followed by monochloramine 1.7 1.5

Inactivation attributed to synergism 0.4 0

Source: Finch, 1997.

pH 8.0: Chlorine dioxide 1.0 mg/L for 5 minutes, monochloramine 2.0 mg/L for 150 minutes.

pH 11.0: Chlorine dioxide 1.0 mg/L for 5 minutes, monochloramine 2.0 mg/L for 5 minutes.

slide5

Recovery of Bacterial Activity After

Shock Dosage with ClO2 and Cl2.

L. McGuire, and T. Dishinger, "Chlorine Dioxide Solves Biofouling

Problems in a Refinery Cooling Tower Used for Phenol Destruction," CTI, Houston, 1984.

slide7

Comparison of Oxidation Potential and

Oxidation Capacity of Several Oxidants Along

with Relative Oxidation of Materials Commonly

Found in Cooling Water.

slide9

Cooling Tower Treatments

Choose the Treatment that is Right for You

HVAC Systems

Light Industrial

Heavy Industrial