chlorination Flashcards
What is chlorination?
Chlorination is the process of adding chlorine to water or wastewater to kill pathogens and disinfect.
True or False: Chlorination is only used for drinking water treatment.
False
What are the primary purposes of chlorination in water treatment?
The primary purposes are disinfection, oxidation of contaminants, and taste and odor control.
Fill in the blank: Chlorination can be achieved using __________ forms of chlorine.
gas, liquid, or solid
What is the most common form of chlorine used in water treatment?
Sodium hypochlorite
Multiple Choice: Which of the following is NOT a method of chlorination? A) Gas chlorination B) Liquid chlorination C) Thermal chlorination D) Solid chlorination
C) Thermal chlorination
What is the main chemical reaction that occurs during chlorination?
Chlorine reacts with water to form hypochlorous acid and hydrochloric acid.
True or False: Chlorination is effective against all microorganisms.
False
What are chloramines?
Chloramines are chemical compounds formed when chlorine reacts with ammonia.
Fill in the blank: The contact time required for effective chlorination is influenced by __________.
the concentration of chlorine and the level of contamination
What is breakpoint chlorination?
Breakpoint chlorination is the point at which all chlorine demand is satisfied, and additional chlorine results in a free chlorine residual.
Multiple Choice: Which of the following is a disadvantage of chlorination? A) Cost-effectiveness B) Formation of disinfection byproducts C) Effective against viruses D) Easy to monitor
B) Formation of disinfection byproducts
What are the potential health risks associated with chlorination?
Potential health risks include the formation of trihalomethanes and other disinfection byproducts that may be carcinogenic.
True or False: Chlorination is a process that can only be done at the treatment plant.
False
What is the role of chlorine dioxide in water treatment?
Chlorine dioxide is used as an alternative disinfectant that is effective at lower concentrations and does not form chlorinated byproducts.
Fill in the blank: The effectiveness of chlorination is affected by __________ levels in water.
pH and temperature
What is the purpose of dechlorination?
Dechlorination is the process of removing chlorine from water to protect aquatic life before discharge.
Multiple Choice: Which of the following is a common dechlorination agent? A) Sodium thiosulfate B) Calcium hypochlorite C) Ozone D) Hydrogen peroxide
A) Sodium thiosulfate
What is the significance of free chlorine in chlorination?
Free chlorine is the portion of chlorine that is available for disinfection and is not combined with other substances.
True or False: Chlorination can eliminate all pathogens from water.
False
What is a chlorine residual?
Chlorine residual is the amount of chlorine remaining in the water after the chlorination process.
Fill in the blank: __________ is the term used for the unwanted compounds formed during chlorination.
Disinfection byproducts
What is the purpose of monitoring chlorine levels in treated water?
To ensure effective disinfection and compliance with health regulations.
Multiple Choice: What is the primary advantage of using chlorination? A) Cost efficiency B) No health risks C) No need for monitoring D) Instantaneous disinfection
A) Cost efficiency
What is the impact of organic matter on chlorination efficacy?
Organic matter can consume chlorine, reducing its effectiveness as a disinfectant.
True or False: Chlorination can be used in both municipal and industrial water treatment.
True
