Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
What is the MCL for HAA5s?
2.
The pH scale ranges from?
3.
What sludge dewatering process requires a pre-coat of diatomaceous earth and its use has declined due to other newer methods?
4.
What are the four zones that divide a typical sedimentation basin?
5.
What is the most favorable raw water condition for good flocculation?
6.
Filtration rates vary from what of filter surface area?
7.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
8.
If the water temperature decreases this will cause the disinfection action of chlorine to?
9.
Water that is softened has a high pH and a high concentration of CaCO3. Therefore stabilization is essential in order to prevent the CaCO3 from precipitating out on?
10.
What chemical is slacked lime?
11.
If a filter is operating at a normal flow rate, its ability to trap flocculated particles is suspension is a function of?
12.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
13.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
14.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
15.
A change in the water elevation from the normal level to the pumping level is?
16.
Impurities that do not dissolve in water and settle out eventually are?
17.
An increase in filter media head loss could be an indicator of?
18.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
19.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
20.
What two principles cause water hardness?
21.
What TON will consumers start to notice?
22.
Anaerobic conditions in reservoirs can cause what problem?
23.
The most accurate chlorine residual measurement would be taken with?
24.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
25.
A grout seal should be?
