WASTEWATER TEST COMPREHENSIVE
STUDY GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Safety:What type of fire extinguishers should be in pump stations.
Answer: A-B-C chemical type
◍ Two types of grit removal.
Answer: Velocity controlled grit chambers, aerated grit chambers.
◍ WasteWater Sources & Characteristics:In general, what is the % of
suspended solids in the total amount of solids.
Answer: 30%
◍ Sedimentation and Flotation:Name one gas this irritates the "eyes".
Answer: chlorine
◍ Basic Chemistry:What piece of laboratory glassware is primarily used to
mix checmicals and measure approximately volumes?.
Answer: beaker
◍ Basic Chemistry:The electrical potential between two points is measured in.
Answer: volts
◍ Safety:If some magnesium is on fire, what class of fire is it?.
Answer: 3
◍ pH.
Answer: The log of the reciprocal of the the hydrogen ion concentration. PH
6 is 10 times the hydrogen ion concentration of 7. 5 is 100 times the conc of
ph 7.
◍ Carbon dioxide.
Answer: Aerobic bacteria exhale carbon dioxide. Anaerobic bacteria
, produce carbon dioxide. Non flammable, odorless, not toxic but can
asphyxiate at high conc, heavier than air.
◍ Waste Treatment Ponds:Which one of the following nuisance organisms is
controller simply by the water surface being disturbed by wind or currents?.
Answer: mosquitoes
◍ Standard rate trickling filter.
Answer: HL= 25-100gpd/ft2, OL= 5-25 lb bod/ d 1000 ft3 of media, media
is 6-8 ft rock, recirculation during low flows.
◍ Acid formers.
Answer: Converts part of the complex organic mixture in the influent sludge
stream into volatile acids( organic acids) including acetic, propionic, and
butyric acids
◍ Roughing filter.
Answer: OL= greater than 300 lb of BOD/ d 1000ft3. Generally used to
reduce organic loading to downstream biological treatment processes.
◍ WasteWater Sources & Characteristics:Combined wastewater is defined as.
Answer: sanitary wastewater and stormwater runoff
◍ Basic Chemistry:Describe "colloids".
Answer: an ion opposite in charge to a colloidal particle will force its way
into the colloidal particle
◍ Chlorine storage.
Answer: 1 ton tanks, 150 lb tanks. Have metal plugs that melt between
158-165f.
◍ Safety:How far back from the opening of a trench should soil be excavated
from that tench be placed.
Answer: 2 ft at least
◍ Wastewater Solids Processing:The solids treatment method uses a partially
submerged rotating drum.
Answer: vacuum filter
, ◍ combined sewers.
Answer: Convey sanitary waste water combined with storm water.
◍ Hydrogen sulfide h2s.
Answer: Toxic, flammable and explosive, rotten egg odor, dulls sense of
smell, paralyzes ability to breath, corrosive, heavier than air collects in low
lying areas.
◍ Wastewater Solids Processing:The solids treatment method uses evaporation
but also requires a great deal of labor..
Answer: sand drying beds
◍ Primary clarifier performance.
Answer: The BOD and TSS tests should be run on 24hr, flow weighted
primary influent and primary effluent composite samples. SS test should
always be a grab sample.
◍ Basic WasteWater Treatment:The biochemical oxygen demand (BOD) test
usually has a specific time of.
Answer: 5 days
◍ BOD.
Answer: Depletion of dissovled oxygen in a sample over 5 days at 20c is
measured. Direct measure of the amount of dissolved oxygen consumed by
aerobic bacteria over five days, indirect measure of the organic strength of
waste water, used to asses the performance of WTP and the unit operations
and unit processes used in WTP.
◍ Anaerobic digester safety.
Answer: Pressure/vacuum relief valves, flame arrester, drip and
sedimentation traps, pressure regulators, thermal valve, waste gas burner.
◍ Wastewater Solids Processing:The solids treatment methods processes
solids in a sealed unit:.
Answer: anaerobic digestion
◍ RAS.
STUDY GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Safety:What type of fire extinguishers should be in pump stations.
Answer: A-B-C chemical type
◍ Two types of grit removal.
Answer: Velocity controlled grit chambers, aerated grit chambers.
◍ WasteWater Sources & Characteristics:In general, what is the % of
suspended solids in the total amount of solids.
Answer: 30%
◍ Sedimentation and Flotation:Name one gas this irritates the "eyes".
Answer: chlorine
◍ Basic Chemistry:What piece of laboratory glassware is primarily used to
mix checmicals and measure approximately volumes?.
Answer: beaker
◍ Basic Chemistry:The electrical potential between two points is measured in.
Answer: volts
◍ Safety:If some magnesium is on fire, what class of fire is it?.
Answer: 3
◍ pH.
Answer: The log of the reciprocal of the the hydrogen ion concentration. PH
6 is 10 times the hydrogen ion concentration of 7. 5 is 100 times the conc of
ph 7.
◍ Carbon dioxide.
Answer: Aerobic bacteria exhale carbon dioxide. Anaerobic bacteria
, produce carbon dioxide. Non flammable, odorless, not toxic but can
asphyxiate at high conc, heavier than air.
◍ Waste Treatment Ponds:Which one of the following nuisance organisms is
controller simply by the water surface being disturbed by wind or currents?.
Answer: mosquitoes
◍ Standard rate trickling filter.
Answer: HL= 25-100gpd/ft2, OL= 5-25 lb bod/ d 1000 ft3 of media, media
is 6-8 ft rock, recirculation during low flows.
◍ Acid formers.
Answer: Converts part of the complex organic mixture in the influent sludge
stream into volatile acids( organic acids) including acetic, propionic, and
butyric acids
◍ Roughing filter.
Answer: OL= greater than 300 lb of BOD/ d 1000ft3. Generally used to
reduce organic loading to downstream biological treatment processes.
◍ WasteWater Sources & Characteristics:Combined wastewater is defined as.
Answer: sanitary wastewater and stormwater runoff
◍ Basic Chemistry:Describe "colloids".
Answer: an ion opposite in charge to a colloidal particle will force its way
into the colloidal particle
◍ Chlorine storage.
Answer: 1 ton tanks, 150 lb tanks. Have metal plugs that melt between
158-165f.
◍ Safety:How far back from the opening of a trench should soil be excavated
from that tench be placed.
Answer: 2 ft at least
◍ Wastewater Solids Processing:The solids treatment method uses a partially
submerged rotating drum.
Answer: vacuum filter
, ◍ combined sewers.
Answer: Convey sanitary waste water combined with storm water.
◍ Hydrogen sulfide h2s.
Answer: Toxic, flammable and explosive, rotten egg odor, dulls sense of
smell, paralyzes ability to breath, corrosive, heavier than air collects in low
lying areas.
◍ Wastewater Solids Processing:The solids treatment method uses evaporation
but also requires a great deal of labor..
Answer: sand drying beds
◍ Primary clarifier performance.
Answer: The BOD and TSS tests should be run on 24hr, flow weighted
primary influent and primary effluent composite samples. SS test should
always be a grab sample.
◍ Basic WasteWater Treatment:The biochemical oxygen demand (BOD) test
usually has a specific time of.
Answer: 5 days
◍ BOD.
Answer: Depletion of dissovled oxygen in a sample over 5 days at 20c is
measured. Direct measure of the amount of dissolved oxygen consumed by
aerobic bacteria over five days, indirect measure of the organic strength of
waste water, used to asses the performance of WTP and the unit operations
and unit processes used in WTP.
◍ Anaerobic digester safety.
Answer: Pressure/vacuum relief valves, flame arrester, drip and
sedimentation traps, pressure regulators, thermal valve, waste gas burner.
◍ Wastewater Solids Processing:The solids treatment methods processes
solids in a sealed unit:.
Answer: anaerobic digestion
◍ RAS.
