TEXAS WASTEWATER CLASS A,B, C AND CLASS D BUNDLE NEWEST ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
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TEXAS WASTEWATER CLASS A NEWEST 2024-2025
ACTUAL EXAM COMPLETE 200 QESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Why is recirculation needed in a trickling filter? – ANSWER- a.
Keep the media wet b. Further reduce BOD c. Flood the filter to
control ponding and filter flies
- What type of fire extinguisher would be used on an electrical
control panel that has been de-energized? – ANSWER- f. a class
a and d class c
Disinfection with chlorine is the most effective at a pH of –
ANSWER- 6.0 - The biomass on a normal functioning RBC has what
appearance? – ANSWER- Grey to brown and 0.05 to 0.1 inch
thick
The sludge from a primary clarifier should contain what percent
solids? – ANSWER- b. 4% to 6%
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What is eutrophication in a pond system? – ANSWEREnrichment with nitrogen and phosphorous Causes algae blooms
- A wastewater stabilization pond has 130,680 sq. ft. It has a
three to one slope on the embankment and has an average depth
of 5 ft. Approximately how many people will this pond provide
wastewater treatment for? 130,680 sq ft = 3 acres x 35 lbs /
BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person 43,560
sq ft l acre – ANSWER- d. 600
A”Racetrack” is what type of Activate Sludge treatment? –
ANSWER- Extended air
Which form of activated sludge must have primary clarifiers? –
ANSWER- Conventional
What is the relationship between F/M ratio and MCRT? –
ANSWER- Indirect; if one goes up, the other goes down
Which activated sludge process does not achieve complete
nitrification? – ANSWER- Contact stabilization
Which form of activated sludge does the better job of handling
shock or toxic loads? – ANSWER- Complete mix
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Which of activated sludge has two aeration basins per single
treatment unit? – ANSWER- Contact stabilization
- A complete mix activated sludge plant has a fast settling
sludge and high amounts of pin floc leaving the clarifier. One
method of correcting the problem is to – ANSWER- Increase
F/M ratio by wasting more
problem is Testing of mixed liquor indicates the MLSS is 2500
mg/L and the settling test shows that a 1000 ml sample settles to
400 mls after 30 minutes. What is the SVI? 400 x 1000 2500
160 – ANSWER- 160
In the problem above, what the sludge quality? – ANSWERBulking
Which activated sludge process has 18 to 20 + hours detention
time in the aeration basin? – ANSWER- Extended air
What is the minimum clearance from the sidewall of a pipe to
the trench wall in an excavation? – ANSWER- 4 inches
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What is the definition of pH? – ANSWER- The logarithm of the
reciprocal of the hydrogen ion concentration The negative
logarithm of the hydrogen ion concentration
How often should pH meters be calibrated? – ANSWER- Daily
trench is 4,100 feet long, four 4 wide and 6 feet deep. There is a
12-inch diameter pipe in the bottom of the trench. How many
cubic yards of material were removed from the trench?
4x6x4,100 3,644 27 – ANSWER- 3,644
In the problem above, how many cubic yards of material will be
required to fill the trench? 3.14×0.5 x0.5 x 4,100 =119cu yds 27
3,644 -119 = 3,525 – ANSWER- 3,525
What is the standard chlorine residual and contact time on Texas
discharge permits? – ANSWER- e. None of the above
organization increases,
As the complexity of an organization increases, what
management function becomes most important? – ANSWERPlanning
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TEXAS WASTEWATER CLASS B NEWEST 2024-2025
ACTUAL EXAM COMPLETE 200 QESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Organic loading of a stabilization pond is about _ pounds of BOD/acre/day with a detention time of at least days. –
ANSWER- 35 BOD/ 30 Days
Anaerobic digesters are covered to keep out , and to trap useful methane which can be used to keep the digester warm. – ANSWER- free oxygen Unstable anareobic sludge contains streaks of _ or
. – ANSWER- gray/green
Aerobic digestion is an process whereby the aerobic bacteria consume themselves – ANSWER- Endogenous Approved disposal methods for digested, dewatered, sludge’s are landfill, and __. – ANSWER- Incineration & Land
Application
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Landfill applied sludge must have a solids content of at least
___percent – ANSWER- 20 Calcium Hypochlorite (HTH) is a strong _ and reacts
violently with . – ANSWER- Oxidizer/Oil &
Hydrocarbons
When added to water chlorine forms __&_______acid –
ANSWER- Hydrochlorous and Hydrochloric
When ammonia is present in wastewater and reacts with
chlorine_________are formed – ANSWER- Chloramines
Effluent dosage of chlorine in the contact chamber must produce
a total combined residual of – ANSWER- 1.0 mg/L after 20
minutes
Besides disinfection, chlorine has other uses at the wastewater
treatment plant such as – ANSWER- Reduces BOD, Odor,
Algae growth, Helps with Grease
TCEQ allows the reuse of wastewater, some of these include –
ANSWER- Irrigation, aquifer recharge, cooling towers and fire
protection
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All reclaimed water piping must be _______in color –
ANSWER- purple
Before entering a manhole the operator should test for
________and oxygen levels and ________the manhole before
entering. – ANSWER- all hazardous gasses and ventilate
When a municipal wastewater effluent has a high nitrate level
and low ammonia level this most likely means – ANSWER- the
effluent has received a high degree of aerobic treatment
Total solids in wastewater are the sum of – ANSWER- Settleable
and volatile solids
This treatment device is commonly used to separate and remove
large solids from raw wastewater – ANSWER- A Mechanically
raked bar screen
___________would have an adverse effect on the proper settling
of solids in a clarifier. – ANSWER- A short circuiting flow
pattern
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This test would give the best information on how efficiently a
trickling filter was operating – ANSWER- Percent BOD
Removal
This trickling filter problem could be reduced by increasing the
recirculation ratio – ANSWER- Filter files
What gases are produced by the controlled anaerobic digestion
of wastewater sludge’s – ANSWER- Methane & Carbon Dioxide
These diseases are caused by pathogenic organisms that may be
present in raw wastewater – ANSWER- Hepatitis, typhoid,
paratyphoid, dysentery, cholera, gastroenteritis, polio,
hookworm and giardiasis
During heavy rain it is possible that manholes and lift stations
may overflow, discharge waste materials into roadways or
ditches. This type of discharge (SSO) would be – ANSWERconsidered an unavoidable discharge, a violation of the Texas
Water Code, a bypass that must be reported within 24 hours and
considered a health hazard
An effective way for the collection system worker to prevent
infection by waterborn pathogenic organism is to – ANSWER
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TEXAS WASTEWATER CLASS C NEWEST 2024-2025
ACTUAL EXAM COMPLETE 300 QESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
What conditions should an operator observe in a well controlled
activated sludge process? – ANSWER- surface
turbulence/uniform roll pattern; foam/small amount of lightcolored, crisp foam; odors/mild, earthy; color/medium-brown
What conditions should an operator observe in a well controlled
clarifier? – ANSWER- very little surface scum; a sludge blanket
covering 1/4 of the bottom; uniform weir flow (all the way
around); almost no rising solids and overflow should be clear
and free of floc
What type solids cannot go onto a trickling filter? – ANSWERlarge suspended solids
Important factors to a well operating trickling filter… –
ANSWER- continuous food supply, aerobic conditions and a
moist zoogleal mass
Basic elements of a trickling filter are… – ANSWER- floor and
walls; distributor arms; underdrains and media
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What must be durable and provide enough surface for bacterial
growth with a trickling filter? – ANSWER- filter media
The zoogleal mass on a filter is composed mainly of what? –
ANSWER- bacteria and algae
The materials resulting from the stabilization of waste material
as it passes through a trickling filter are… – ANSWER- water,
nitrates and carbon dioxide
What are zoogleal solids called that are washed off a trickling
filter? – ANSWER- sloughings (which settle in the final
clarifier)
Units commonly used to measure the rate of hydraulic loading
are… – ANSWER- lb/ft/day
Units commonly used to measure the rate of organic loading
include… – ANSWER- lb BOD/acre ft/day
and
lb BOD/1000 ft3/day
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Trickling filters may be classified as…. – ANSWER- high-rate;
roughing; standard-rate
The underdrain system of a standard rate trickling filter should
be… – ANSWER- designed to flow half-full
The recirculation ratio of a trickling filter has an effect on… –
ANSWER- organic matter removal; odors; filter flies
What test best indicates the efficiency of a trickling filter? –
ANSWER- percent BOD removal
Filter operational problems include… – ANSWER- ponding;
filter flies (psychoda); odors
Filter ponding may be caused by… – ANSWER- poor quality
rock; excessive organic loading; inefficient primary clarifier
Methods of controlling filter flies include… – ANSWER- flood
the filter
To control odors at a trickling filter plant, the operator can… –
ANSWER- increase recirculation, practice good housekeeping
and chlorinate the influent
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Clogged orifices on influent distributor arms may be corrected
by… – ANSWER- cleaning and flushing
Rotating biological contactors are usually covered to… –
ANSWER- prevent algae growth on the media
The rotating discs should be… – ANSWER- partially submerged
in the wastewater
Rotating biological contactors may be… – ANSWER- driven by
electric motors or trapped air
The biological growth on the disc of a rotating biological
contactor should… – ANSWER- contain approximately 50,000
mg/L solids; be 0.05-0.1 inch thick after one or two weeks; and
be gray to brown in color
The RBC (rotating biological contactor) unit must be preceded
by a… – ANSWER- primary clarifier or fine screen
A condition(s) that adversely affect(s) the operation of a rotating
biological contactor is… – ANSWER- toxic materials from
industrial wastes; hydrogen sulfide; high or low pH
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TEXAS WASTEWATER CLASS D NEWEST 2024-2025
ACTUAL EXAM COMPLETE 300 QESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
One of the most important purposes of a public water supply is
_.
a. swimming
b. landscape watering
c. car washing
d. firefighting – ANSWER- d. firefighting
Organic matter includes .
a. sand
b. plants, animals and humans
c. minerals
d. all listed – ANSWER- b. plants, animals and humans
The most important treatment process is , which
destroys disease-causing organisms.
a. filtration
b. disinfection
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c. softening
d. fluoridation – ANSWER- b. disinfection
Public water systems are required to compile a monthly report
showing .
a. rate increases
b. accidents
c. dates of dead-end flushing
d. disciplinary action – ANSWER- c. dates of dead-end flushing
Most groundwater is relatively free of suspended matter, but
can be a major problem in surface water. – ANSWERturbidity
Color in a public water supply should be less than _ units. – ANSWER- less than 15 units Chemical characteristics of water include hardness, pH, solids, and . – ANSWER- gases
Water is considered hard when it exceeds __ mg/L of
calcium carbonate. – ANSWER- 100 (may vary depending on
who you talk to)
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A gallon of water weighs _ pounds and 1 mg/L equals one . – ANSWER- water weights 8.34 pounds
1 mg/L equals one part per million
Hydrogen sulfide is heavier than air, colorless, flammable, toxic,
and has a odor. – ANSWER- rotten egg (unless you
get a dose that’s so heavy it numbs your sense of smell)
Excessive nitrates in drinking water can cause
syndrome in infants. – ANSWER- blue baby syndrome
Excessive amounts of fluoride may cause or staining
of teeth. – ANSWER- mottling
Trihalomethanes and haloacetic acids are byproducts of
chlorination and may increase risk. – ANSWERcancer
The action level for copper is _ mg/L and for lead it is _ mg/L. – ANSWER- copper is 1.3 mg/L
lead is 0.015 mg/L
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_ are underground, water-bearing formations yielding useful quantities of water. – ANSWER- Aquifers The quantity of water a formation yields depends on the thickness and of the formation. – ANSWER- permeability
Problems caused by are declining water levels and
subsidence. – ANSWER- overpumping
Well and cementing protect the well from collapse and
surface contamination. – ANSWER- Well casing
The purpose of the well screen is to keep out birds and insects.
(true/false) – ANSWER- false (the well screen keeps out sand;
the well vent screen keeps out birds and insects)
The most important feature of the well screen is the length.
(true/false) – ANSWER- false (the mesh size is the most
important feature)
The __ of the screen is determined by the size of the aquifer
material, the size of the gravel in the gravel pack, and the type of
well development. – ANSWER- mesh size
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