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Wastewater Wastewater Treatment Study Material Quiz am Class C Wastewater Treatment Plant Operator Questions, erstellt von Dean Lampman am 29/12/2017.

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Class C Wastewater Treatment Plant Operator Questions

Frage 1 von 45

1

pH is the measure of

Wähle eine der folgenden:

  • Amount of an acid

  • Intensity of basic or acidic condition of a liquid

  • Acidity

  • Alkalinity

Erklärung

Frage 2 von 45

1

The second stage of anaerobic digestion is called

Wähle eine der folgenden:

  • Acid formation

  • Stabilization

  • Methane formation

  • Pathogenic formation

Erklärung

Frage 3 von 45

1

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

Wähle eine der folgenden:

  • 100

  • 250

  • 457

  • 567

Erklärung

Frage 4 von 45

1

Chlorine gas is how many times heavier than air?

Wähle eine der folgenden:

  • 1 times

  • 2.5 times

  • 7 times

  • 25 times

Erklärung

Frage 5 von 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.

Wähle eine der folgenden:

  • Capacity of chlorinator too low

  • Too little solids in effluent

  • Contact time too short

  • Chlorine demand too high

Erklärung

Frage 6 von 45

1

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

Wähle eine der folgenden:

  • Aeration, pH, and RAS

  • Aeration, pH and WAS

  • RAS, WAS and aeration

  • pH, RAS and WAS

Erklärung

Frage 7 von 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?

Wähle eine der folgenden:

  • Over-oxidized sludge

  • Hydraulic washout

  • Young sludge

  • SVI too low

Erklärung

Frage 8 von 45

1

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

Wähle eine der folgenden:

  • 0.3 hours

  • 3.0 hours

  • 13.0 hours

  • 16.8 hours

Erklärung

Frage 9 von 45

1

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

Wähle eine der folgenden:

  • Withdrawing sludge too frequently

  • Improper sludge removal

  • Excessive I&I entering WWTP

  • Excessive oil and grease entering WWTP

Erklärung

Frage 10 von 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?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 11 von 45

1

A fixed sample is

Wähle eine der folgenden:

  • 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

Erklärung

Frage 12 von 45

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 13 von 45

1

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

Wähle eine der folgenden:

  • pH too high

  • MLSS too low

  • Waste temperature too high

  • WAS too low

Erklärung

Frage 14 von 45

1

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

Wähle eine der folgenden:

  • One year

  • Three years

  • Five years

  • Forever

Erklärung

Frage 15 von 45

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 16 von 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?

Wähle eine der folgenden:

  • Lower aeration tank effluent weirs

  • Increase RAS

  • Add chlorine to RAS

  • Reduce clarifier hydraulic loading rates.

Erklärung

Frage 17 von 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?

Wähle eine der folgenden:

  • Weir over flow rate

  • Determine effluent suspended solids concentration

  • Calculate the sludge age

  • DO in the aeration tank

Erklärung

Frage 18 von 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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 19 von 45

1

The first step in anaerobic digestion is called

Wähle eine der folgenden:

  • Acid formation

  • Stabilization

  • Methane formation

  • Alkalinity formation

Erklärung

Frage 20 von 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.

Wähle eine der folgenden:

  • 17.8

  • 129.6

  • 480.0

  • 575.0

Erklärung

Frage 21 von 45

1

The two main gases formed in the anaerobic digestion process are

Wähle eine der folgenden:

  • Nitrogen and oxygen

  • Methane and oxygen

  • Methane and water

  • Methane and carbon dioxide

Erklärung

Frage 22 von 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

Wähle eine der folgenden:

  • F/M Ratio decreased

  • Increased organic load into tank

  • Denitrification occuring

  • MCRT too long

Erklärung

Frage 23 von 45

1

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

Wähle eine der folgenden:

  • 1

  • 2

  • 6

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

Erklärung

Frage 24 von 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?

Wähle eine der folgenden:

  • CO2

  • Purple K

  • Pressurized water

  • Dry chemical

Erklärung

Frage 25 von 45

1

Mixing dry granular chlorine with petroleum products will

Wähle eine der folgenden:

  • Create anhydrous chlorine dioxide

  • Create an explosive device

  • Create hydrogen dioxide

  • Create a white cloud

Erklärung

Frage 26 von 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 _______________ ?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 27 von 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?

Wähle eine der folgenden:

  • 0.42 mg/L

  • 1.4 mg/L

  • 2.3 mg/L

  • 4.2 mg/L

Erklärung

Frage 28 von 45

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 29 von 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:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 30 von 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?

Wähle eine der folgenden:

  • 4%

  • 40%

  • 89%

  • 99%

Erklärung

Frage 31 von 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

Wähle eine der folgenden:

  • Sludge decomposing in the tank

  • Sludge collection mechanism is off

  • Insufficient sludge removal

  • Sludge blanket too low

Erklärung

Frage 32 von 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 ?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 33 von 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?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 34 von 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:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 35 von 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:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 36 von 45

1

The fusible plug on a chlorine cylinder is designed to:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 37 von 45

1

How many times heavier than air is methane gas?

Wähle eine der folgenden:

  • 1 time

  • 2.5 times

  • 4.6 times

  • Methane is lighter than air

Erklärung

Frage 38 von 45

1

The combination of methane and _____________ can be very combustible?

Wähle eine der folgenden:

  • Carbon monoxide

  • Carbon dioxide

  • Carbon tetrazini

  • Oxygen

Erklärung

Frage 39 von 45

1

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

Wähle eine der folgenden:

  • Ordinary paper, wood and trash

  • Flammable fuels

  • Electrical equipment

  • Flammable metals

Erklärung

Frage 40 von 45

1

F/M Ratio can be BEST be described as:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 41 von 45

1

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

Wähle eine der folgenden:

  • Total chlorine residual

  • Effluent CBOD

  • Effluent pH

  • Effluent fecal coliform

Erklärung

Frage 42 von 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:

Wähle eine der folgenden:

  • 8 hours from discovery

  • 12 hours from discovery

  • 24 hours from discovery

  • 72 hours from discovery

Erklärung

Frage 43 von 45

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 44 von 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?

Wähle eine der folgenden:

  • 100

  • 200

  • 500

  • 800

Erklärung

Frage 45 von 45

1

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

Wähle eine der folgenden:

  • Ice the sample for no less than 6 hours minimum

  • Ice to 4 degrees C

  • 0.5% nitric acid

  • 0.2% sulfuric acid

Erklärung

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