This operator’s study guide represents the results of an ambitious program. Operators of
wastewater facilities, regulators, educators and wastewater businesses, jointly prepared the
objectives and exam questions for this subclass.
How to use this study guide with references
In preparation for the exams you should:
1. Read all of the key knowledges for each objective.
2. Use the resources listed at the end of the study guide for additional information.
3. Review all key knowledges until you fully understand them and know them by memory.
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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)
Lecture 3: 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.
Lecture 3: 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.
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.
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 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 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.
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 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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