Basic Wastewater Disinfection Exam Questions with Verified Solutions (Graded A+) Already Passed
Breakpoint chlorination - Answers The process of using chlorines oxidative capacity to oxidize ammonia
to nitrogen. At this point free chlorine residual starts to appear
Chlorination - Answers disinfection of water by the addition of small amounts of chlorine or a chlorine
compound
Combined total chlorine - Answers The amount of chlorine that has combined with ammonia to form
chloramines or other chlorine compounds
Dechlorination - Answers Removal of the excess chlorine before discharge to surface waters since
chlorinated treated sewage effluents may be harmful to fish and other aquatic life.
geometric mean - Answers a statistical measure of central tendency that minimizes the effect of outliers.
fecal coliforms - Answers organisms used to determine the effectiveness of disinfection. Commonly
found in the intestinal tracts of humans and other warm blooded animals
free available chlorine - Answers chlorine available after chlorine demand has been satisfied in the forms
of hypochlorous acid and hypochlorite ions
hypo chlorination - Answers The use of liquid chlorine compounds to achieve disinfection
pathogenic organisms - Answers Microorganism that causes disease in the discharge od waterborne
human wastes
total residual chlorine - Answers The sum of free available chlorine and combined available chlorine.
Monitoring requirements for discharge permits require total residual chlorine testing.
Treatment Facility Overflow - Answers a release of wastewater, other than through permitted outflows,
into the water of the state or land. TFO's must be reported to DNR within 24 hrs
List the prevalent diseases that can be contracted through wastewater exposure. - Answers
Gastroenteritis, dysentery, Hepatitis B and C, Giardiasis, upper respiratory illness
Reasons for disinfecting treated water - Answers To reduce the discharge of waterborne pathogenic
organisms, to protect public health in drinking water and recreational activities
Explain the significance of using an indicator organism. - Answers The destruction of the indicator
organism would mean the likely destruction of pathogenic organisms
Chlorine Dosage - Answers Amount of Chlorine fed to achieve disinfection and reported as a
concentration in milligrams per liter or pounds per day
chlorine demand - Answers amount of chlorine used to disinfect wastewater after a given contact time
chlorine residual - Answers amount of chlorine remaining after a given contact time
Breakpoint chlorination - Answers The process of using chlorines oxidative capacity to oxidize ammonia
to nitrogen. At this point free chlorine residual starts to appear
Chlorination - Answers disinfection of water by the addition of small amounts of chlorine or a chlorine
compound
Combined total chlorine - Answers The amount of chlorine that has combined with ammonia to form
chloramines or other chlorine compounds
Dechlorination - Answers Removal of the excess chlorine before discharge to surface waters since
chlorinated treated sewage effluents may be harmful to fish and other aquatic life.
geometric mean - Answers a statistical measure of central tendency that minimizes the effect of outliers.
fecal coliforms - Answers organisms used to determine the effectiveness of disinfection. Commonly
found in the intestinal tracts of humans and other warm blooded animals
free available chlorine - Answers chlorine available after chlorine demand has been satisfied in the forms
of hypochlorous acid and hypochlorite ions
hypo chlorination - Answers The use of liquid chlorine compounds to achieve disinfection
pathogenic organisms - Answers Microorganism that causes disease in the discharge od waterborne
human wastes
total residual chlorine - Answers The sum of free available chlorine and combined available chlorine.
Monitoring requirements for discharge permits require total residual chlorine testing.
Treatment Facility Overflow - Answers a release of wastewater, other than through permitted outflows,
into the water of the state or land. TFO's must be reported to DNR within 24 hrs
List the prevalent diseases that can be contracted through wastewater exposure. - Answers
Gastroenteritis, dysentery, Hepatitis B and C, Giardiasis, upper respiratory illness
Reasons for disinfecting treated water - Answers To reduce the discharge of waterborne pathogenic
organisms, to protect public health in drinking water and recreational activities
Explain the significance of using an indicator organism. - Answers The destruction of the indicator
organism would mean the likely destruction of pathogenic organisms
Chlorine Dosage - Answers Amount of Chlorine fed to achieve disinfection and reported as a
concentration in milligrams per liter or pounds per day
chlorine demand - Answers amount of chlorine used to disinfect wastewater after a given contact time
chlorine residual - Answers amount of chlorine remaining after a given contact time
