WATER TREATMENT LATEST EXAM PREP
QUESTIONS AND ANSWERS PDF 2026
▶ D/DBP stage 1 Answer: Establishes a technique or enhanced
coagulation & softening and sets a Total Organic Carbon removal based on
the alkalinity of the raw water.
▶ D/DBP Stage 2 Answer: Establishes an initial Distribution Evaluation
and moves the sampling calculation to locational Running Annual Average.
▶ Monomictic Lakes Answer: One mixing in Warner climates
▶ Dimictic lakes Answer: Two mixings in colder climates
▶ Epilimnion Answer: An upper layer of warm water with high levels of
dissolved oxygen (upper part of a stratified reservior)
▶ Metalimnion / Thermocline Answer: middle layer in a stratified reservior
▶ Hypolimnion zone Answer: lower layer
▶ Biochemical oxygen demand (BOD) in the metalimnion & hypolimnion
causes... Answer: Anaerobic conditions: rotten egg odor, increase iron and
magnanese
▶ Microbial conditions include... Answer: Viruses, bacteria, and Giardia
(parasite)
▶ Nitrogen based fertilizers runoff into reserviors causing: Answer:
Eutrophic conditions
▶ Industrial Discharges such as.. Answer: mining operations produce:
Cyanide, asbestos, and in GW: solvents (TCE, PCE) and Perchlorate
▶ Chemical control of Algal Blooms include the use of... Answer: Copper
Sulphate Pentahydrate/ Bluestone and Hydrogen Peroxide
, ▶ Aeration Answer: The process of adding air to water. Air can be passed
through water or passing water through air.
▶ Reaeration Answer: The introduction of air through forced air diffusers
into the lower layers of the reservior.
▶ Destratification Answer: The development of vertical mixing within a lake
or reservior to eliminate or separate layers of temperature, plant, or animal
life.
▶ Water Intake structures Answer: Provide water to the treatment plant,
prevent large debris from entering the treatment process, and constructed
to provide pressure to the distribution system.
▶ What is pure water? Answer: Pure water is the absence of soluble and
insoluble substances in it.
▶ Can pure water exist in nature? Answer: Yes and No. Precipitate is pure
until it reaches the ground where soluble and insoluble substances leach
into it. It can be achieved, however, by in exchange, reverse osmosis, or
distillation.
▶ universal solvent Answer: Dissolves into anything (Water).
▶ The two types of compounds are... Answer: Molecular and Ionic
compounds
▶ Coagulation and Flocculation Answer: The purpose of this process is to
remove types of particulate impurities called: suspended solids, colloidal
matter, and dissolved solids.
▶ Flash mixing takes... Answer: about 3 to 5 seconds at the most.
▶ Suspended and collodial matter have a negative charge so.... Answer:
they naturally repel each other. This is called the ZETA Potential.
▶ When flash mixing... Answer: the lower the temperature of the water, the
less effective coagulant is. we'll have to add more chemical or allow for a
longer detention time.
QUESTIONS AND ANSWERS PDF 2026
▶ D/DBP stage 1 Answer: Establishes a technique or enhanced
coagulation & softening and sets a Total Organic Carbon removal based on
the alkalinity of the raw water.
▶ D/DBP Stage 2 Answer: Establishes an initial Distribution Evaluation
and moves the sampling calculation to locational Running Annual Average.
▶ Monomictic Lakes Answer: One mixing in Warner climates
▶ Dimictic lakes Answer: Two mixings in colder climates
▶ Epilimnion Answer: An upper layer of warm water with high levels of
dissolved oxygen (upper part of a stratified reservior)
▶ Metalimnion / Thermocline Answer: middle layer in a stratified reservior
▶ Hypolimnion zone Answer: lower layer
▶ Biochemical oxygen demand (BOD) in the metalimnion & hypolimnion
causes... Answer: Anaerobic conditions: rotten egg odor, increase iron and
magnanese
▶ Microbial conditions include... Answer: Viruses, bacteria, and Giardia
(parasite)
▶ Nitrogen based fertilizers runoff into reserviors causing: Answer:
Eutrophic conditions
▶ Industrial Discharges such as.. Answer: mining operations produce:
Cyanide, asbestos, and in GW: solvents (TCE, PCE) and Perchlorate
▶ Chemical control of Algal Blooms include the use of... Answer: Copper
Sulphate Pentahydrate/ Bluestone and Hydrogen Peroxide
, ▶ Aeration Answer: The process of adding air to water. Air can be passed
through water or passing water through air.
▶ Reaeration Answer: The introduction of air through forced air diffusers
into the lower layers of the reservior.
▶ Destratification Answer: The development of vertical mixing within a lake
or reservior to eliminate or separate layers of temperature, plant, or animal
life.
▶ Water Intake structures Answer: Provide water to the treatment plant,
prevent large debris from entering the treatment process, and constructed
to provide pressure to the distribution system.
▶ What is pure water? Answer: Pure water is the absence of soluble and
insoluble substances in it.
▶ Can pure water exist in nature? Answer: Yes and No. Precipitate is pure
until it reaches the ground where soluble and insoluble substances leach
into it. It can be achieved, however, by in exchange, reverse osmosis, or
distillation.
▶ universal solvent Answer: Dissolves into anything (Water).
▶ The two types of compounds are... Answer: Molecular and Ionic
compounds
▶ Coagulation and Flocculation Answer: The purpose of this process is to
remove types of particulate impurities called: suspended solids, colloidal
matter, and dissolved solids.
▶ Flash mixing takes... Answer: about 3 to 5 seconds at the most.
▶ Suspended and collodial matter have a negative charge so.... Answer:
they naturally repel each other. This is called the ZETA Potential.
▶ When flash mixing... Answer: the lower the temperature of the water, the
less effective coagulant is. we'll have to add more chemical or allow for a
longer detention time.
