Ozone Disinfection
Spartan Environmental Technologies supplies ozone generators for ozone disinfection applications including drinking
water, cooling water, process water, aquaculture, marine parks among many other applications. Below you will find
technical information on how ozone disinfects and how it compares to other commonly used disinfectants. If you would
like additional information on ozone disinfection or ozone generation equipment call Spartan at 1-800-492-1252 or e-mail
us at info@spartanwatertreatment.com.
How Ozone Disinfects?
Ozone functions as both an oxidant and disinfectant in the treatment of drinking (potable) water and wastewater. This is
similar to chlorine. Chlorine and Ozone, however, operate by different mechanisms when disinfecting water. As a result,
ozone and chlorine can act synergistically.
Ozone's germicidal properties are associated with its high oxidation potential. Disinfection by ozone is a direct result of
bacterial cell wall disintegration, also known as lysis. This mechanism is different than that by chlorine. Although the
exact chemical action of chlorine is not clear, it is believed that the chlorine residual in aqueous solution diffuses through
the cell wall of the microorganisms and attacks the enzyme group which results in the destruction of the microorganism.
The graphics below illustrate the process while the photomicrograph show actual bacteria before and after ozonation:
Spartan Environmental Technologies supplies ozone generators for ozone disinfection applications including drinking
water, cooling water, process water, aquaculture, marine parks among many other applications. Below you will find
technical information on how ozone disinfects and how it compares to other commonly used disinfectants. If you would
like additional information on ozone disinfection or ozone generation equipment call Spartan at 1-800-492-1252 or e-mail
us at info@spartanwatertreatment.com.
How Ozone Disinfects?
Ozone functions as both an oxidant and disinfectant in the treatment of drinking (potable) water and wastewater. This is
similar to chlorine. Chlorine and Ozone, however, operate by different mechanisms when disinfecting water. As a result,
ozone and chlorine can act synergistically.
Ozone's germicidal properties are associated with its high oxidation potential. Disinfection by ozone is a direct result of
bacterial cell wall disintegration, also known as lysis. This mechanism is different than that by chlorine. Although the
exact chemical action of chlorine is not clear, it is believed that the chlorine residual in aqueous solution diffuses through
the cell wall of the microorganisms and attacks the enzyme group which results in the destruction of the microorganism.
The graphics below illustrate the process while the photomicrograph show actual bacteria before and after ozonation:
Disinfection Power of Ozone
To demonstrate the disinfection power of ozone and compare it with other oxidizing agents, Morris developed the lethality
coefficient:
Lethality Coefficient= 4.6/(Ct99) where:
C = residual concentration in mg/L
t99 = time in minutes for 99 percent microorganism destruction (2-log destruction)
Morris, J.C., "Aspects of the Quantitative Assessment of Germicidal Efficiency," in Chap. 1, J.D. Johnson (ED.),
Disinfection, Water and Wastewater, Ann Arbor Science, Ann Arbor, MI 1975.
The table below lists parameters for disinfection by ozone for different organisms:
To demonstrate the disinfection power of ozone and compare it with other oxidizing agents, Morris developed the lethality
coefficient:
Lethality Coefficient= 4.6/(Ct99) where:
C = residual concentration in mg/L
t99 = time in minutes for 99 percent microorganism destruction (2-log destruction)
Morris, J.C., "Aspects of the Quantitative Assessment of Germicidal Efficiency," in Chap. 1, J.D. Johnson (ED.),
Disinfection, Water and Wastewater, Ann Arbor Science, Ann Arbor, MI 1975.
The table below lists parameters for disinfection by ozone for different organisms:
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a - Lethality Coefficient = 4.6/(Ct99)
b - C 99:10 = concentration in mg/liter for 99 percent destruction or inactivation in 10 minutes
(Morris considered these values to be valid within a factor of two)
Comparison of the values in this table with similar values obtained for chlorine is shown in the table below. These values
tabulated by Morris illustrate that ozone is a more powerful germicide against all classes of organisms listed by factors of
10 to 100. The table shows values of the lethality coefficient:
b - C 99:10 = concentration in mg/liter for 99 percent destruction or inactivation in 10 minutes
(Morris considered these values to be valid within a factor of two)
Comparison of the values in this table with similar values obtained for chlorine is shown in the table below. These values
tabulated by Morris illustrate that ozone is a more powerful germicide against all classes of organisms listed by factors of
10 to 100. The table shows values of the lethality coefficient:
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Spartan Environmental Technologies
Air and Water Treatment
Air and Water Treatment
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Spartan Environmental
Technologies, L.L.C.
7383 Lauren J Dr
Mentor, OH 44060
USA
Phone: 800-492-1252
Fax: 440-368-3569
E-mail: info@
spartanwatertreatment.com
Technologies, L.L.C.
7383 Lauren J Dr
Mentor, OH 44060
USA
Phone: 800-492-1252
Fax: 440-368-3569
E-mail: info@
spartanwatertreatment.com
Ozone Water Disinfection and Purification
