Disinfection Flashcards
What processes purpose is to prevent outbreak of waterborne diseases?
Disinfection
What disinfectant consists of a yellow gas, which is 2.5 times heavier than air
Chlorine Gas
What byproducts are made when using Chlorine Gas as a disinfectant?
Hypochlorous Acid & hydrochloric Acid
Chlorine with disinfecting power left over, which safeguards against further Chlorine Demand.
Free Chlorine Residual
This type of residual has not reacted to anything in the water.
Free Chlorine Residual
This type of disinfectant comes in liquid form and has a chlorine strength of 12.5%.
Sodium Hypochlorite
______ is used to eliminate pathogens in drinking water.
Disinfection
What situations require disinfection.
Laying new water mains, repair and maintenance, and sanitizing storage tanks
This disinfectant lowers the Ph of water when introduced.
Chlorine Gas
Chlorine that reacts with organic & inorganic material will determine _______.
Chlorine Demand
What are the two parts of Total Chlorine Residual.
Free Chlorine Residual & Combined Chlorine Residual
This type of residual has combined itself with something in the water.
Combined Chlorine Residual
House hold Clorox is a type of this disinfectant.
Sodium Hypochlorite
This disinfectant comes in tablet or granular form, and has a chlorine strength of 65%.
Calcium Hypochlorite
What is it called when you have added chlorine to water until the chlorine demand has been met.
Breakpoint
Natural Organic Material + Chlorine Disinfectant = _________.
Disinfectant Byproduct
What method is used to take chlorine residual samples.
DPD Method
The maximum Chlorine residual requirement is.
4 mg/L
The minimum Chlorine residual requirement is.
0.2 mg/L
These two disinfectants raise the Ph level of water when used.
Sodium Hypochlorite & Calcium Hypochlorite
This disinfectant is also known as High Test Hypochlorite (HTH).
Calcium Hypochlorite
What happens when you add chlorine after breakpoint has been met.
Free Chlorine Residual rises
What Happens when you don’t store Calcium Hypochlorite in a cool and dry location.
Moisture will breakdown the disinfectant, and excess heat will cause Chlorine gas to form which may create an explosive hazard
What are two types of disinfectant byproducts when using Chloromine.
Trihalomethane & haloacetic Acid
What are 5 factors that affect chlorine effectiveness
Chlorine Residual Concentration, Contact Time, Ph Level, Temperature, and Turbidity
When Chlorine is combined with ammonia what does it make.
Chloromine
What are 3 types of Chloromine.
Monochloromine, Dichloromine, and Trichloramine
What are the three major types of disinfectants.
Chlorine, Chloromine, and Ozone
What are the advantages of using Ozone as a disinfectant.
Generated on-site, contact time is short, and it is good at destroying viruses
What are some disadvantages of using Ozone as a disinfectant.
Ozone is an unstable gas and highly corosive
What happens when bromide is present while using Ozone as a disinfectant.
Ozone can react and make bromate
