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CLASS B WASTEWATER TEXTBOOK Questions & answers
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CLASS B WASTEWATER TEXTBOOK Questions & answers
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CLASS B WASTEWATER TEXTBOOKQuestions & answers
If wastewater contains dissolved oxygen, the biological breakdown will reduce sulfate to
sulfide.
T or F - ** VERIFIED ANSWERS **✔✔False
At a pH below 5, all sulfide is present in the gaseous h2s form and most of it can be released
from wastewater.
T or F - ** VERIFIED ANSWERS **✔✔True
In order to control odors effectively, the operator should know where odors originate and
the cause.
T or F - ** VERIFIED ANSWERS **✔✔True
Chlorination is one of the oldest and least effective methods of controlling odors.
T or F - ** VERIFIED ANSWERS **✔✔False- it is one of the oldest & most effective
The reaction of chlorine with certain chemicals can cause a more odorous gas.
T or F - ** VERIFIED ANSWERS **✔✔True
Decreasing the pH of wastewater is an effective odor control method for hydrogen sulfide.
T or F - ** VERIFIED ANSWERS **✔✔False- Increasing is an effective method
Odor control towers must have a biomass established on the filter media in order to remove
odors.
,T or F - ** VERIFIED ANSWERS **✔✔True
The hazard classification of the spent carbon from odor control must be established when
considering disposal.
T or F - ** VERIFIED ANSWERS **✔✔True
Regeneration of activated carbon temporarily eliminates any concerns about hazardous
waste disposal.
T or F - ** VERIFIED ANSWERS **✔✔True
Hydrogen sulfide gas combines with moisture to form sulfuric acid, which is very corrosive.
T or F - ** VERIFIED ANSWERS **✔✔True
Which factor causes increased odor and corrosion problems in wastewater treatment plants?
- ** VERIFIED ANSWERS **✔✔Increased travel times for wastewater to reach treatment
plants
What is the principle source of odor generation in wastewater collection systems and
treatment processes? - ** VERIFIED ANSWERS **✔✔Production of inorganic and organic
gases by microorganisms
What is the main cause of most odors in wastewater systems? - ** VERIFIED ANSWERS
**✔✔Hydrogen sulfide
What is the most common source of sulfide in wastewater? - ** VERIFIED ANSWERS
**✔✔Biological activity in the collection sewer or treatment plant
Why is the temperature of the wastewater system an important factor in the production of
hydrogen sulfide gas? - ** VERIFIED ANSWERS **✔✔The rate of bacterial metabolism is
related to temperature
,Why does ozone have limited use in controlling odors? - ** VERIFIED ANSWERS
**✔✔Because an effective concentration may be too costly to use at large treatment plants
What is the problem with using combustion to remove odors from wastewater treatment
plant gases? - ** VERIFIED ANSWERS **✔✔The combustibility of the gases is so low that
fuel costs are high
How can cathode scale be removed from an electrolytic chemical scrubber unit? - **
VERIFIED ANSWERS **✔✔Flush the system with dilute nitric acid
What is the adsorption odor removal process? The process in which odorous components
are removed from a a gas through - ** VERIFIED ANSWERS **✔✔Adherence to a solid
surface
What is the best solution to odor problems? - ** VERIFIED ANSWERS **✔✔Prevent odors
from ever developing
How are odors generated in wastewater collection systems and treatment plants? - **
VERIFIED ANSWERS **✔✔-Biological generation
-Hydrogen sulfide generation
-Hydrogen transfer schemes
Which problems are created by hydrogen sulfide gas? - ** VERIFIED ANSWERS **✔✔-
corrosion or deterioration of concrete sewer structures
-explosive gas mixtures
-hazards to the respiratory system to persons working in confined or close spaces
-rotten egg odor
, Which items are facts that can help in odor classification? - ** VERIFIED ANSWERS **✔✔-
individuals respond differently to the same odor
-odors travel great distances with the direction of the wind
-small concentrations of odors can be offensive
-some odors are objectionable and others are pleasant
-the human nose rapidly becomes fatigued (insensitive) to odors
Investigations in the neighborhood near the location of an odor complaint may reveal that
the odors are coming from which possible nearby sources? - ** VERIFIED ANSWERS
**✔✔-dead animal
-home plumbing problem
-sewer
-storm drain
-trash pile
Which items are possible solutions operators can use to control odors? - ** VERIFIED
ANSWERS **✔✔-changing or enforcing sewer-use ordinances
-immediately removing floating scum/solids
-maintaining dissolved oxygen in the wastewater
-minimizing hydraulic detention times in pipes and wet wells
-routinely and frequently disposing of screenings and grit
How does chlorine control odors? - ** VERIFIED ANSWERS **✔✔-destroys bacteria that
convert sulfate to sulfide
-destroys hydrogen sulfide at the point of application
-inhibits the growth of slime layers in sewers
How does hydrogen peroxide control odors? - ** VERIFIED ANSWERS **✔✔-by killing
sulfate-reducing bacteria
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