Chemical Feed Flashcards
(32 cards)
Explain the following terms and their relationship to each other: free chlorine, total chlorine, demand, residual, pre-chlorination, post-chlorination, and breakpoint chlorination
What is the process of chlorination called as a treatment process and how does it differ from sterilization
What are the physical properties of chlorine, what hazards does it present, what advantages does it have over most other disinfections, and how does it react with bacteria
What is the purpose of a fusible plug, at what temperature does it melt, and where is it located on a 150-lb. and 1-ton cylinders
What is the correct procedure to follow in changing a chlorine cylinder and what item should always be replaced with a new one in doing so
How, when, and where should residuals be taken and what information do they provide
What is DBP used for in relation to chlorine and how does it work
What is SCBA, where should it be stored in relation to the chlorine room, what special training should be used with it, and at what frequency
What are the three available forms of chlorine and what are the most common percentage strengths of each of the three forms
What is HTH and what different forms and strengths is it commonly available in
What effect does the addition of chlorine gas to water have on the water’s pH
What chemical is used to detect chlorine leaks and how is it best used
What type of piping should be used for chlorine
How much expansion will take place if one gallon of liquid chlorine is vaporized, and what is the specific gravity of chlorine gas
What type of respiratory protection should be used when working with chlorine
What are the two different types of chlorine residual and what are the advantages and disadvantages of each
What are other types of disinfectants other than chlorine and what are some of the advantages and disadvantages of each
How are hypochlorite solutions generally added to drinking water
How many turns should the valve on a chlorine cylinder be opened and where should the valve wrench be kept
What is a rotameter and what does it do
What is the minimum dosage for disinfecting new water mains using the tablet method as described in AWWA C-651
What effect do the following water quality parameters have on the disinfection process: temperature, pH, turbidity, organic matter, and hardness
Where do most chlorine leaks occur, what type is the most serious and what action is usually taken first to stop a leak
What are chloramines, how are they formed, what problems can result from their presence in a water system, and what advantages does monochloramine have over a free residual
