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152 Cards in this Set
- Front
- Back
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The killing or inactivation of pathogenic organisms in drinking water. |
Disinfection |
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Diseases caused by pathogenic organisms in potable water are called? |
Waterborne |
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Calcium Hypochlorite in dry powder form contains what % available chlorine by weight. |
65 to 70% |
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Chlorinated water with the highest concentration of hypochlorous acid has a pH of ?
A. 5 B. 7 C. 9 D. 11 |
A. 5 |
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Chlorine dioxide is used as a powerful disinfectant and will also lower the formation potential of... |
Trihalomethanes |
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Chlorine dioxide is used as a powerful disinfectant and will also lower the formation potential of... |
Trihalomethanes |
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Of the three forms of chlorine, which is the most commonly used in disinfecting drinking water? |
Chlorine Gas |
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When chlorine and water mix together they form... |
Hypochlorous acid and hydrochloric acid |
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When chlorine and water mix together they form... |
Hypochlorous acid and hydrochloric acid |
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Chlorine will disinfect quicker at a pH of... |
7.0 and 6.0 |
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When chlorine and water mix together they form... |
Hypochlorous acid and hydrochloric acid |
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Chlorine will disinfect quicker at a pH of... |
7.0 and 6.0 |
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A longer contact time is required to disinfect water at a lower? |
Temperature |
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When chlorine and water mix together they form... |
Hypochlorous acid and hydrochloric acid |
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Chlorine will disinfect quicker at a pH of... |
7.0 and 6.0 |
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A longer contact time is required to disinfect water at a lower? |
Temperature |
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A chlorine gas leak in and around a chlorinator can be detected by using? |
Ammonia vapors |
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The odor detection of chlorine gas is? |
0.2 mg/L |
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The odor detection of chlorine gas is? |
0.2 mg/L |
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If ammonia vapor passes over a chlorine leak the presence of the leak is indicated by a? |
White cloud |
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The odor detection of chlorine gas is? |
0.2 mg/L |
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If ammonia vapor passes over a chlorine leak the presence of the leak is indicated by a? |
White cloud |
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What are the components of chlorine residual? |
Combine chlorine plus free chlorine |
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The odor detection of chlorine gas is? |
0.2 mg/L |
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If ammonia vapor passes over a chlorine leak the presence of the leak is indicated by a? |
White cloud |
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What are the components of chlorine residual? |
Combine chlorine plus free chlorine |
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The required minimum chlorine residual at the furthest end of the distribution system is? |
0.2 mg/L |
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The maximum rate of chlorine withdrawal from a 150-pound cylinder is? |
40 lbs |
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The fusible plug in the 150-pound Chlorine cylinders is designed to melt at what temperature? |
158 degrees |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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The characteristics of Chlorine gas are? |
Greenish yellow, non-flammable, heavier than air |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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The characteristics of Chlorine gas are? |
Greenish yellow, non-flammable, heavier than air |
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Sodium hypochlorite is?
A. a commercially available dry chlorine compound.
B. A commercially available chlorine solution. |
B. a commercially available chlorine solution |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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The characteristics of Chlorine gas are? |
Greenish yellow, non-flammable, heavier than air |
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Sodium hypochlorite is?
A. a commercially available dry chlorine compound.
B. A commercially available chlorine solution. |
B. a commercially available chlorine solution |
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A reagent used for testing chlorine residual? |
DPD |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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The characteristics of Chlorine gas are? |
Greenish yellow, non-flammable, heavier than air |
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Sodium hypochlorite is?
A. a commercially available dry chlorine compound.
B. A commercially available chlorine solution. |
B. a commercially available chlorine solution |
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A reagent used for testing chlorine residual? |
DPD |
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As the water temperature decreases, the disinfection action of chlorine will? |
Decrease |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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The characteristics of Chlorine gas are? |
Greenish yellow, non-flammable, heavier than air |
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Sodium hypochlorite is?
A. a commercially available dry chlorine compound.
B. A commercially available chlorine solution. |
B. a commercially available chlorine solution |
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A reagent used for testing chlorine residual? |
DPD |
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As the water temperature decreases, the disinfection action of chlorine will? |
Decrease |
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Which of the following conditions must you change when your chlorine residual is in hypochlorite form?
A. Calcium B. Hardness C. pH D. Total alkalinity |
C. pH |
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Which of the following has no disinfecting capacities?
A. Hypochlorous acid B. Hydrochloric acid |
Hydrochloric acid |
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Which must be present for a breakpoint chlorination curve to develop when chlorine is added to water? |
Ammonia |
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When should a chlorinator or hypo chlorinator at a well work? |
Only when the well pump is running. |
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Chlorine demand increases when ______ increases?
A. Alkalinity B. Organic matter C. Phosphate concentration D. pH |
B. Organic matter |
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The characteristics of Chlorine gas are? |
Greenish yellow, non-flammable, heavier than air |
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Sodium hypochlorite is?
A. a commercially available dry chlorine compound.
B. A commercially available chlorine solution. |
B. a commercially available chlorine solution |
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A reagent used for testing chlorine residual? |
DPD |
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As the water temperature decreases, the disinfection action of chlorine will? |
Decrease |
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Which of the following conditions must you change when your chlorine residual is in hypochlorite form?
A. Calcium B. Hardness C. pH D. Total alkalinity |
C. pH |
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Which disinfection residual cause Chlorine taste and odor problems? |
Dichloramines |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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Disease causing bacteria are known as? |
Pathogenic |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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Disease causing bacteria are known as? |
Pathogenic |
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What is chlorine dose? |
Chlorine demand plus chlorine residual |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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Disease causing bacteria are known as? |
Pathogenic |
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What is chlorine dose? |
Chlorine demand plus chlorine residual |
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What is disinfection? |
Selective destruction or inactivation of pathogenic organisms |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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Disease causing bacteria are known as? |
Pathogenic |
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What is chlorine dose? |
Chlorine demand plus chlorine residual |
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What is disinfection? |
Selective destruction or inactivation of pathogenic organisms |
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What is commonly used indicator of possible health problems found in plants, soil, water and the intestines of humans and warm blooded animals. |
Coliform bacteria |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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Disease causing bacteria are known as? |
Pathogenic |
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What is chlorine dose? |
Chlorine demand plus chlorine residual |
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What is disinfection? |
Selective destruction or inactivation of pathogenic organisms |
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What is commonly used indicator of possible health problems found in plants, soil, water and the intestines of humans and warm blooded animals. |
Coliform bacteria |
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What is the process of adding chlorine to water until the chlorine demand has been satisfied? |
Breakpoint chlorination |
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A chlorine feed room should be?
A. Closed with no ventilation B. Open at the top C. Ventilated near the floor level D. Ventilated near the top of the room |
C. Ventilated near the floor level |
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|
Chlorine forms chloramines by combining with?
A. Ammonia B. Nitrates C. Nitrites D. Hydrogen ions |
Ammonia |
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The amount of chlorine actually used up in reaction with impurities is called? |
Chlorine demand |
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|
Disease causing bacteria are known as? |
Pathogenic |
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What is chlorine dose? |
Chlorine demand plus chlorine residual |
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What is disinfection? |
Selective destruction or inactivation of pathogenic organisms |
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What is commonly used indicator of possible health problems found in plants, soil, water and the intestines of humans and warm blooded animals. |
Coliform bacteria |
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What is the process of adding chlorine to water until the chlorine demand has been satisfied? |
Breakpoint chlorination |
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A hypochlorinator is? |
Used to feed a liquid solution into a water supply |
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How can the growth of iron bacteria be controlled?
A. Chlorination B. Coagulation C. Filtration D. Sedimentation |
A. Chlorination |
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How can the growth of iron bacteria be controlled?
A. Chlorination B. Coagulation C. Filtration D. Sedimentation |
A. Chlorination |
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Since chlorine residual is related to pH, it may be said that a higher pH requires? |
Higher chlorine residual |
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How can the growth of iron bacteria be controlled?
A. Chlorination B. Coagulation C. Filtration D. Sedimentation |
A. Chlorination |
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Since chlorine residual is related to pH, it may be said that a higher pH requires? |
Higher chlorine residual |
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If disinfection is incomplete because of the chlorine residual is in the hypochlorite ion form, what should you change to improve disinfection? |
pH |
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The chlorine gas feed rate is controlled by adjusting the? |
Rotameter control valve |
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The chlorine gas feed rate is controlled by adjusting the? |
Rotameter control valve |
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When chlorine gas leaks from the chlorinator, the use of water may cause? |
Hypochlorite acid |
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The chlorine gas feed rate is controlled by adjusting the? |
Rotameter control valve |
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When chlorine gas leaks from the chlorinator, the use of water may cause? |
Hypochlorite acid |
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Which of the following is the most effective disinfection residual?
A. Trichloramine B. Hypochlorous acid C. Chloramines D. Hypochlorite ion |
Hypochlorous acid |
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The chlorine gas feed rate is controlled by adjusting the? |
Rotameter control valve |
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When chlorine gas leaks from the chlorinator, the use of water may cause? |
Hypochlorite acid |
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Which of the following is the most effective disinfection residual?
A. Trichloramine B. Hypochlorous acid C. Chloramines D. Hypochlorite ion |
Hypochlorous acid |
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What does the product of C xT provide a measurement of? |
Degree of pathogenic inactivity |
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What is the required minimum chlorine residual for compliance with microbial standards for Giardia and viruses? |
0.2 mg/L |
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What is the required minimum chlorine residual for compliance with microbial standards for Giardia and viruses? |
0.2 mg/L |
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Why is turbidity of importance to public health? |
Interferes with disinfection |
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What is the symbol for free chlorine? |
HOCl |
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What is the symbol for free chlorine? |
HOCl |
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The primary source of trihalomethanes in drinking water is? |
The reaction of chlorine compounds and organic matter |
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How should you move a 150 lb chlorine cylinder? |
Use a hand truck |
