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Wastewater Wastewater Treatment Study Material Test sobre Class C Wastewater Treatment Plant Operator Questions, creado por Dean Lampman el 29/12/2017.

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Class C Wastewater Treatment Plant Operator Questions

Pregunta 1 de 45

1

pH is the measure of

Selecciona una de las siguientes respuestas posibles:

  • Amount of an acid

  • Intensity of basic or acidic condition of a liquid

  • Acidity

  • Alkalinity

Explicación

Pregunta 2 de 45

1

The second stage of anaerobic digestion is called

Selecciona una de las siguientes respuestas posibles:

  • Acid formation

  • Stabilization

  • Methane formation

  • Pathogenic formation

Explicación

Pregunta 3 de 45

1

One liter of elemental liquid chlorine can evaporate and produce how many liters of chlorine gas

Selecciona una de las siguientes respuestas posibles:

  • 100

  • 250

  • 457

  • 567

Explicación

Pregunta 4 de 45

1

Chlorine gas is how many times heavier than air?

Selecciona una de las siguientes respuestas posibles:

  • 1 times

  • 2.5 times

  • 7 times

  • 25 times

Explicación

Pregunta 5 de 45

1

PLANT PROBLEM: Plant effluent coliform count fails to meet required standards for disinfection. Chlorine residual is normal. Disinfection supplies are not a problem.

Selecciona una de las siguientes respuestas posibles:

  • Capacity of chlorinator too low

  • Too little solids in effluent

  • Contact time too short

  • Chlorine demand too high

Explicación

Pregunta 6 de 45

1

The most important adjustments to the activated sludge process are made by adjusting

Selecciona una de las siguientes respuestas posibles:

  • Aeration, pH, and RAS

  • Aeration, pH and WAS

  • RAS, WAS and aeration

  • pH, RAS and WAS

Explicación

Pregunta 7 de 45

1

Problem: Classic sludge bulking occurring in the final clarifier of a conventional activated sludge plant. Indicators include solids pouring over the weirs, excessive floc observed at the surface, and a homogenous sludge blanket appearing throughout the clarifier. Sludge in settling test settles slowly leaving a cloudy supernatant. What is the MOST probable cause?

Selecciona una de las siguientes respuestas posibles:

  • Over-oxidized sludge

  • Hydraulic washout

  • Young sludge

  • SVI too low

Explicación

Pregunta 8 de 45

1

PROBLEM: Operational data is given below for a primary clarifier:
Influent flow: 2.5 mgd
Primary tank volume: 41,310 cubic feet

Selecciona una de las siguientes respuestas posibles:

  • 0.3 hours

  • 3.0 hours

  • 13.0 hours

  • 16.8 hours

Explicación

Pregunta 9 de 45

1

As the operator of a primary clarifier, you notice black and odorous septic wastewater leaving the clarifier. What is the probable cause?

Selecciona una de las siguientes respuestas posibles:

  • Withdrawing sludge too frequently

  • Improper sludge removal

  • Excessive I&I entering WWTP

  • Excessive oil and grease entering WWTP

Explicación

Pregunta 10 de 45

1

PROBLEM: Plant fecal coliform counts do not meet State standards. The chlorine supply is not the problem, there is adequate vacuum and chlorine feed. The chlorine contact tank has no solids build-up and the effluent flow is below design. That is the MOST likely cause?

Selecciona una de las siguientes respuestas posibles:

  • High chlorine demand from excessive ammonia in effluent

  • High chlorine demand from excessive nitrate in effluent

  • High chlorine demand from excessive nitrite in effluent

  • High chlorine demand from excessive polymer in effluent

Explicación

Pregunta 11 de 45

1

A fixed sample is

Selecciona una de las siguientes respuestas posibles:

  • Not broken

  • A sample purposely 'spiked' by the lab technician for QA/QC

  • A series of composite samples

  • A sample preserved in the field upon completion

Explicación

Pregunta 12 de 45

1

According to FDEP Chapter 62-602 FAC, an operator could have his/her license permanently revoked for

Selecciona una de las siguientes respuestas posibles:

  • Falsified or misrepresented reports, logs or lab sheets

  • Cheating on an exam

  • Incompetence in operation of a wastewater treatment plant

  • Submitting false data on license application

Explicación

Pregunta 13 de 45

1

PROBLEM: Excessive white, billowing foam in the aeration tank surface.

Selecciona una de las siguientes respuestas posibles:

  • pH too high

  • MLSS too low

  • Waste temperature too high

  • WAS too low

Explicación

Pregunta 14 de 45

1

According to Chapter 62-620 FAC, Wastewater Permitting, plant records must be maintained on-site for how many years?

Selecciona una de las siguientes respuestas posibles:

  • One year

  • Three years

  • Five years

  • Forever

Explicación

Pregunta 15 de 45

1

What happens in the stabilization (re-aeration) tank in the contact-stabilization process?

Selecciona una de las siguientes respuestas posibles:

  • Adsoption of the activated floc

  • Adsorption of waste material by microorganisms

  • Agglomeration of the activated floc

  • Adsorption and digestion of the waste material collected by microorganisms

Explicación

Pregunta 16 de 45

1

PROBLEM: Good settling in the 30 minute settleability test. Excessive floc billowing in the clarifier and washing out. Sludge scrapers and RAS system appear normal. What is the BEST solution to fix the problem?

Selecciona una de las siguientes respuestas posibles:

  • Lower aeration tank effluent weirs

  • Increase RAS

  • Add chlorine to RAS

  • Reduce clarifier hydraulic loading rates.

Explicación

Pregunta 17 de 45

1

PROBLEM: Classic sludge bulking occurring in the final clarifier of a conventional activated sludge plant. Indicators include solids pouring over the weirs, excessive floc observed at the surface, and a homogenous sludge blanket appearing throughout the clarifier. Sludge in settling test settles slowly leaving a cloudy supernatant. What is the necessary check to confirm the cause?

Selecciona una de las siguientes respuestas posibles:

  • Weir over flow rate

  • Determine effluent suspended solids concentration

  • Calculate the sludge age

  • DO in the aeration tank

Explicación

Pregunta 18 de 45

1

In a well operated activated sludge plant, when the RAS rate is decreased but the WAS rate remains constant, the expected conditions would be

Selecciona una de las siguientes respuestas posibles:

  • MLSS decreases, F/M Ration increases, MCRT decreases

  • MLSS decreases, F/M Ration decreases, MCRT increases

  • MLSS increases, F/M Ration increases, MCRT decreases

  • MLSS increases, F/M Ration decreases, MCRT increases

Explicación

Pregunta 19 de 45

1

The first step in anaerobic digestion is called

Selecciona una de las siguientes respuestas posibles:

  • Acid formation

  • Stabilization

  • Methane formation

  • Alkalinity formation

Explicación

Pregunta 20 de 45

1

A screenings dumpster is full at the headworks of the treatment plant. The dumpster is 6 ft tall, 10 ft long and 8 ft wide. How many cubic yards of screenings myst be disposed of.

Selecciona una de las siguientes respuestas posibles:

  • 17.8

  • 129.6

  • 480.0

  • 575.0

Explicación

Pregunta 21 de 45

1

The two main gases formed in the anaerobic digestion process are

Selecciona una de las siguientes respuestas posibles:

  • Nitrogen and oxygen

  • Methane and oxygen

  • Methane and water

  • Methane and carbon dioxide

Explicación

Pregunta 22 de 45

1

In an activated sludge plant, if the DO in the aeration tank suddenly decreases and the aerators are not the problem, what is the most probable cause

Selecciona una de las siguientes respuestas posibles:

  • F/M Ratio decreased

  • Increased organic load into tank

  • Denitrification occuring

  • MCRT too long

Explicación

Pregunta 23 de 45

1

How many fusible plugs can be found on a one-ton chlorine container?

Selecciona una de las siguientes respuestas posibles:

  • 1

  • 2

  • 6

  • There are no fusible plugs on a one-ton container

Explicación

Pregunta 24 de 45

1

A fire has started in the maintenance shop due to an ignition of petroleum oil. Which type of fire extinguisher should not be used to fight the fire?

Selecciona una de las siguientes respuestas posibles:

  • CO2

  • Purple K

  • Pressurized water

  • Dry chemical

Explicación

Pregunta 25 de 45

1

Mixing dry granular chlorine with petroleum products will

Selecciona una de las siguientes respuestas posibles:

  • Create anhydrous chlorine dioxide

  • Create an explosive device

  • Create hydrogen dioxide

  • Create a white cloud

Explicación

Pregunta 26 de 45

1

A confined space is defined as having a space large enough to bodily enter and perform work, has limited entry and egress and is _______________ ?

Selecciona una de las siguientes respuestas posibles:

  • Not designed for continuous occupancy

  • Designed for state exam prep classes

  • Not designed to perform strenuous computer calculations

  • Designed as a long term hurricane and tornado shelter

Explicación

Pregunta 27 de 45

1

What is the dosage of chlorine, in mg/L, if the flow being treated is 85,000 gpd and 3 pounds of chlorine are used per day?

Selecciona una de las siguientes respuestas posibles:

  • 0.42 mg/L

  • 1.4 mg/L

  • 2.3 mg/L

  • 4.2 mg/L

Explicación

Pregunta 28 de 45

1

When properly adjusted, the rope packing on a centrifugal pump is designed to leak how much?

Selecciona una de las siguientes respuestas posibles:

  • One drip per second

  • One drip per hour

  • A steady, pencil sized stream should flow at all times

  • There should be NO leaks from a rope packing

Explicación

Pregunta 29 de 45

1

In a lab, a dilute acid solution must be prepared for titration in the alkalinity test. The proper procedure for making the weak acid is to:

Selecciona una de las siguientes respuestas posibles:

  • Add the water slowly to the concentrated acid to begin dilution

  • Add the water quickly to the acid to begin dilution

  • Add the acid directly to the sample without dilution

  • Add the acid slowly to the dilution water

Explicación

Pregunta 30 de 45

1

What is the removal efficiency of the solids contact/trickling filter process if the influent TSS is 439 mg/L and the plant effluent TSS is 4.0 mg/L?

Selecciona una de las siguientes respuestas posibles:

  • 4%

  • 40%

  • 89%

  • 99%

Explicación

Pregunta 31 de 45

1

As an operator of a gravity thickener, you notice floating sludge rising throughout the thickener. All of the following may be a cause for the problem EXCEPT

Selecciona una de las siguientes respuestas posibles:

  • Sludge decomposing in the tank

  • Sludge collection mechanism is off

  • Insufficient sludge removal

  • Sludge blanket too low

Explicación

Pregunta 32 de 45

1

PROBLEM: Upon arriving at the package treatment plant serving a small community, you find a uniform sludge blanket rising throughout the clarifier. A settlettling sludge leaving a clear supernatant. MLSS test results are normal, but a calculation of the SVI shows a high sludge volume indability test reveals a very slow seex. What is the MOST likely cause of the high sludge blanket ?

Selecciona una de las siguientes respuestas posibles:

  • The operator has wasted too much sludge, causing a young sludge condition

  • An extreme rain event washed out the majority of the solids

  • Filamentous bacteria are causing the slow settling

  • An overdose of chlorine has killed the floc forming and filament bacteria

Explicación

Pregunta 33 de 45

1

PROBLEM: Solids are washing out of the secondary clarifier of the activated sludge
plant. Plant personnel increase the return activated sludge (RAS) flow rate,
which slows the problem temporarily, but gets worse after 30 minutes.
What is the cause of the plant problem?

Selecciona una de las siguientes respuestas posibles:

  • Increasing the RAS increased the detention time in the clarifier

  • Increasing the RAS decreased the detention time in the clarifier

  • Increasing the RAS increased the detention time in the aeration
    tank

  • Increasing the RAS caused the DO in the aeration tank to increase

Explicación

Pregunta 34 de 45

1

PROBLEM: Solids are washing out of the secondary clarifier of the activated sludge plant. A settleability test shows good settling CAN occur. The MOST likely cause of the problem is:

Selecciona una de las siguientes respuestas posibles:

  • High flows are entering the treatment plant

  • The RAS rate is too low

  • Denitrification is occurring in the chlorine contact tank

  • The sludge collector mechanism is rotating clockwise

Explicación

Pregunta 35 de 45

1

PROBLEM: The chlorine residual is falling, and inspection of the 150 lb cylinder and chlorine feed equipment shows ice forming on the chlorine regulator and feed lines. The BEST method to fix the falling chlorine residual is:

Selecciona una de las siguientes respuestas posibles:

  • switch over to sodium hypochlorite solution

  • place a second chlorine cylinder on-line

  • roll the cylinder so liquid is feeding instead of gas

  • place a 1500W space heater next to the cylinder to thaw the ice

Explicación

Pregunta 36 de 45

1

The fusible plug on a chlorine cylinder is designed to:

Selecciona una de las siguientes respuestas posibles:

  • Melt at 1500 degrees F

  • Prevent a dangerous vacuum from forming in the cylinder

  • Melt at 158-165 degrees F

  • Melt when placed in the direct sunlight

Explicación

Pregunta 37 de 45

1

How many times heavier than air is methane gas?

Selecciona una de las siguientes respuestas posibles:

  • 1 time

  • 2.5 times

  • 4.6 times

  • Methane is lighter than air

Explicación

Pregunta 38 de 45

1

The combination of methane and _____________ can be very combustible?

Selecciona una de las siguientes respuestas posibles:

  • Carbon monoxide

  • Carbon dioxide

  • Carbon tetrazini

  • Oxygen

Explicación

Pregunta 39 de 45

1

A class C fire extinguisher is safe to use of what type of fire?

Selecciona una de las siguientes respuestas posibles:

  • Ordinary paper, wood and trash

  • Flammable fuels

  • Electrical equipment

  • Flammable metals

Explicación

Pregunta 40 de 45

1

F/M Ratio can be BEST be described as:

Selecciona una de las siguientes respuestas posibles:

  • The pounds of CBOD applied to a pound of MLVSS

  • The amount of influent TSS applied to the aeration tank

  • The loading of solids to a trickling filter

  • The amount of soluble CBOD fed to an RBC

Explicación

Pregunta 41 de 45

1

According to FDEP chapter 62-601, FAC, a composite sample shall be used for which test?

Selecciona una de las siguientes respuestas posibles:

  • Total chlorine residual

  • Effluent CBOD

  • Effluent pH

  • Effluent fecal coliform

Explicación

Pregunta 42 de 45

1

According to FDEP chapter 62-604.550 (a) FAC, a wastewater spill shall be verbally reported to the state warning point no later than:

Selecciona una de las siguientes respuestas posibles:

  • 8 hours from discovery

  • 12 hours from discovery

  • 24 hours from discovery

  • 72 hours from discovery

Explicación

Pregunta 43 de 45

1

According to F DEP chapter 62-600.440 (4)(b), basic disinfection is
described as:

Selecciona una de las siguientes respuestas posibles:

  • A chlorine residual of 0.5 mg/L for 30 minutes at peak hourly flow

  • A chlorine residual of 1.0 mg/L for 15 minutes at peak hourly flow

  • A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly flow

  • A chlorine residual of 0.5 mg/L for 30 minutes at average daily flow

Explicación

Pregunta 44 de 45

1

According to FDEP chapter 62-600.440 (4)(c) 4, basic level disinfection, any ONE sample may not exceed how many colonies per 100 ml sample?

Selecciona una de las siguientes respuestas posibles:

  • 100

  • 200

  • 500

  • 800

Explicación

Pregunta 45 de 45

1

The preservative used for transport of the fecal coliform sample is:

Selecciona una de las siguientes respuestas posibles:

  • Ice the sample for no less than 6 hours minimum

  • Ice to 4 degrees C

  • 0.5% nitric acid

  • 0.2% sulfuric acid

Explicación

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