Basic Disinfection Study Guide
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Disinfection
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Chlorination: Disinfection And Oxidation
• Disease causing organisms can be found in surface water and some in ground water, some can be removed by preliminary, primary and secondary treatments processes. But not all are removed.
• The addition of a chemical disinfectant is necessary if a water treatment processes is to meet the coliform MCL, preventing any water borne diseases.
• Cl2, due to it relatively low cost & ease with which it be obtained is the most commonly used chemical for this purpose.
• Chlorine is available in 3 forms:
1. Chlorine Gas
2. Calcium or Sodium Hypochlorite solution
3. Calcium or Sodium Hypochlorite powder (HTH)
Chlorination: Disinfection And Oxidation
• Disease causing organisms can be found in surface water and some in ground water, some can be removed by preliminary, primary and secondary treatments processes. But not all are removed.
• The addition of a chemical disinfectant is necessary if a water treatment processes is to meet the coliform MCL, preventing any water borne diseases.
• Cl2, due to it relatively low cost & ease with which it be obtained is the most commonly used chemical for this purpose.
• Chlorine is available in 3 forms:
1. Chlorine Gas
2. Calcium or Sodium Hypochlorite solution
3. Calcium or Sodium Hypochlorite powder (HTH)
Wastewater Technology Fact Sheet Ozone Disinfection
Disinfection is considered to be the primary mechanism for the inactivation/destruction of pathogenic organisms to prevent the spread of waterborne diseases to downstream users and the environment. It is important that wastewater be adequately treated prior to disinfection in order for any disinfectant to be effective. Table 1 lists some common microorganisms found in domestic wastewater and the diseases associated with them.
Wastewater Technology Fact Sheet Ozone Disinfection
Disinfection is considered to be the primary mechanism for the inactivation/destruction of pathogenic organisms to prevent the spread of waterborne diseases to downstream users and the environment. It is important that wastewater be adequately treated prior to disinfection in order for any disinfectant to be effective. Table 1 lists some common microorganisms found in domestic wastewater and the diseases associated with them.
Biocides for Disinfection and Storage of Hydranautics Membrane Elements
This bulletin provides general information about biocides that may be used with Hydranautics membrane elements for disinfection and/or storage. Before storage or disinfection of Hydranautics elements, one should become familiar with Technical Service Bulletins 108 and 118 which describe the general storage and flushing procedures for all Composite Polyamide, and PVD membrane elements. Also, one should confirm which type of membrane elements are actually in the system. Since elements may be composed of either composite polyamide membrane or polyvinyl derivative, it is imperative to be certain of the type to be disinfected.
Biocides for Disinfection and Storage of Hydranautics Membrane Elements
This bulletin provides general information about biocides that may be used with Hydranautics membrane elements for disinfection and/or storage. Before storage or disinfection of Hydranautics elements, one should become familiar with Technical Service Bulletins 108 and 118 which describe the general storage and flushing procedures for all Composite Polyamide, and PVD membrane elements. Also, one should confirm which type of membrane elements are actually in the system. Since elements may be composed of either composite polyamide membrane or polyvinyl derivative, it is imperative to be certain of the type to be disinfected.
Disinfection and Oxidation
Disinfection:
is killing or inactivate of pathogenic organisms. It is necessary if the water to be used for drinking water is not hygienically reliable. In water treatment, aimed at the production of drinking water, disinfection is the most important treatment step. Purpose of disinfection: To make Drinking water free of any disease causing bacteria and microbes.
Disinfection and Oxidation
Disinfection:
is killing or inactivate of pathogenic organisms. It is necessary if the water to be used for drinking water is not hygienically reliable. In water treatment, aimed at the production of drinking water, disinfection is the most important treatment step. Purpose of disinfection: To make Drinking water free of any disease causing bacteria and microbes.
Chlorine Dioxide Disinfection System For Desalinated Water In Qatar
Meeting the goal of clean, safe drinking water requires a multi-barrier approach that includes:
•Protecting source water from contamination,
•Appropriately treating raw water,
•And ensuring safe distribution of treated water to consumers’ taps.
Chlorine Dioxide Disinfection System For Desalinated Water In Qatar
Meeting the goal of clean, safe drinking water requires a multi-barrier approach that includes:
•Protecting source water from contamination,
•Appropriately treating raw water,
•And ensuring safe distribution of treated water to consumers’ taps.
Disinfection, Chlorination and Oxidation
Chlorination: application of chlorine to water, generally for the purpose of disinfection, but also for other purposes such as odor control.
Disinfection: the addition of chlorine, ozone, UV light, etc. to water in order to kill or inactivate disease causing organisms; effectiveness measured using the coliform test.
Disinfection, Chlorination and Oxidation
Chlorination: application of chlorine to water, generally for the purpose of disinfection, but also for other purposes such as odor control.
Disinfection: the addition of chlorine, ozone, UV light, etc. to water in order to kill or inactivate disease causing organisms; effectiveness measured using the coliform test.
Disinfection
•Destruction or inactivation of pathogenic organisms
•Disinfection can be done by:– chemical means-chlorine, ozone, –non-chemical means-heat, UV irradiation
Disinfection
•Destruction or inactivation of pathogenic organisms
•Disinfection can be done by:– chemical means-chlorine, ozone, –non-chemical means-heat, UV irradiation
Section 5.4 Disinfection with Chlorine Dioxide
1. Characters of chlorine dioxide
• ClO2 is a yellowish‐green gas with acrid odor under room temperature.
• Extremely unstable, both gas and liquid chlorine dioxide are explosive. Thus it should be prepared on site and used as aqueous solution.
• Soluble in water with a solubility 5 times of the chlorine’s; and It exists in water as dissolved gas, without any hydrolysis.
Section 5.4 Disinfection with Chlorine Dioxide
1. Characters of chlorine dioxide
• ClO2 is a yellowish‐green gas with acrid odor under room temperature.
• Extremely unstable, both gas and liquid chlorine dioxide are explosive. Thus it should be prepared on site and used as aqueous solution.
• Soluble in water with a solubility 5 times of the chlorine’s; and It exists in water as dissolved gas, without any hydrolysis.
Disinfection Practices for Water – Basic
. Chemical and physical relationships govern all disinfection chemistry
. Knowledge of these relationships increases operator skills and troubleshooting abilities
. Allows operators to control conditions that optimize disinfection practices
. Treatment processes are managed to disinfect water for consumption and to meet regulatory objectives
. Minimum disinfectant residuals
. CT compliance - demonstration of efficient disinfection
Disinfection Practices for Water – Basic
. Chemical and physical relationships govern all disinfection chemistry
. Knowledge of these relationships increases operator skills and troubleshooting abilities
. Allows operators to control conditions that optimize disinfection practices
. Treatment processes are managed to disinfect water for consumption and to meet regulatory objectives
. Minimum disinfectant residuals
. CT compliance - demonstration of efficient disinfection
Disinfection Alternatives For Water And Wastewater
Most Basic Requirement for Sanitation and Protection of Public Health
Prevent the Spread of Waterborne Disease – Typhoid, Salmonella, Cholera, Hookworm, etc.
Kills or Inactivates Most Disease Sources - Bacteria, Protozoa, Parasites, and Viruses
Used Widely Since Around the Turn of the Century with Huge Public Health Benefits
Reduced Infant Mortality & Increased Longevity
Disinfection Alternatives For Water And Wastewater
Most Basic Requirement for Sanitation and Protection of Public Health
Prevent the Spread of Waterborne Disease – Typhoid, Salmonella, Cholera, Hookworm, etc.
Kills or Inactivates Most Disease Sources - Bacteria, Protozoa, Parasites, and Viruses
Used Widely Since Around the Turn of the Century with Huge Public Health Benefits
Reduced Infant Mortality & Increased Longevity
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