Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
Impurities found in water that do not come from plants or animals are
2.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
3.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
4.
What type of polymers are sometimes formulated with regulated substances?
5.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
6.
Fluoride concentration above what mg/L will likely cause teeth to become pitted?
7.
What is the definition of decant?
8.
In pounds, how much ammonia is contained in a 1 ton cylinder that is full?
9.
Daily flow rates are limited in a conventional treatment plant due to the detention time needed to settle the floc and its sedimentation basin. What is the time range for the clarifier?
10.
Once they become fouled, how are reverse osmosis membranes cleaned?
11.
A change in the water elevation from the normal level to the pumping level is?
12.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
13.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
14.
A pro of chloramines is?
15.
In which state are Giardia most vulnerable to inactivation through disinfection?
16.
What is the best process for sequestering manganese?
17.
Recovered backwash water from a conventional surface water filtration plant may be returned to the headworks if allowed under?
18.
What is the most probable solution if nematodes are interfering with the disinfectant?
19.
When should polyphosphates used for sequestration of iron and manganese from a well be injected?
20.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
21.
Why are check valves installed in suction lines?
22.
What occurs in raw water as the level of ammonia decreases?
23.
The disinfection treatment process is?
24.
If there is a notification of a HazMat spill of an unknown chemical into a stream that provides water to a water treatment plant, what would be the best action taken?
25.
What disinfectant is commonly used and free of Cl2 to avoid THMs?
