Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
The minimum detention time in a conventional detention basin is?
2.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
3.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
4.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
5.
What occurs in raw water as the level of ammonia decreases?
6.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
7.
What is put in place in a reservoir to create an even flow rate through the entire volume of a clearwell to provide a consistent amount of detention time and minimize short-circuiting?
8.
Coagulation is a chemical and physical reaction that converts?
9.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
10.
Where do Enteropathogenic organisms in water supplies originate?
11.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
12.
What is the most effective method for removing tastes and odors?
13.
When entering a permitted confined space entry structure, always complete a permit and?
14.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
15.
Solids contact basins have much shorter detention times than conventional treatment basins.
16.
When using the lime soda ash process, it is impossible to produce water with a hardness of less than?
17.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
18.
What water quality indicator is of greatest concern in a surface water treatment plant?
19.
Regulations require that wastes from water treatment be monitored?
20.
Which is classified as a secondary contaminant?
21.
A property that is important to water treatment that is physical as opposed to chemical is?
22.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
23.
How does Groundwater differ from Surface water sources?
24.
During filtration, what role does the action of straining of suspended particles play?
25.
The organism that causes Giardiasis
