Dean Lampman
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Wastewater Wastewater Treatment Study Material Quiz sobre Operation of Wastewater Treatment Plants Volume 2 Review, criado por Dean Lampman em 21-01-2018.

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Operation of Wastewater Treatment Plants Volume 2 Review

Operation of Wastewater Treatment Plants Volume 2 Review

Questão 1 de 131

1

In the activated sludge process, the oxidation may be by chemical or biological processes.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 2 de 131

1

The removal of organisms from the activated sludge treatment process (sludge wasting) is a very important control technique.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 3 de 131

1

In an air distribution system, an air metering device should be located in a straight section of the air main on the suction side of the blower.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 4 de 131

1

In an aeration tank, the higher the food to microorganism (F/M) ratio, the more food and therefore a lower dissolved oxygen (DO) is needed.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 5 de 131

1

When considering a major process change, first review the plant data and then make only one major change at a time.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 6 de 131

1

Microbiology is another tool for operators to use in controlling the activated sludge process.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 7 de 131

1

The psychrophilic bacteria in anaerobic digesters appear to be able to survive temperatures well below freezing with little or no harm.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 8 de 131

1

Mixing is very important in a digester because it greatly speeds up the digestion rate.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 9 de 131

1

Operators should make every effort to pump as thick a sludge to the digester as possible.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 10 de 131

1

The withdrawal rate of sludge from a digester should be faster than a rate at which the gas production from the system is able to maintain a positive pressure in the digester.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 11 de 131

1

Aerobic sludge digestion completes the oxidation of volatile materials in the digester.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 12 de 131

1

The proper discharge of plant effluent is the final process for the operator.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 13 de 131

1

The principles for collecting samples for measuring dissolved oxygen are the same as for measuring temperature.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 14 de 131

1

Site-specific safety procedures should be confirmed with your local safety regulatory agency.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 15 de 131

1

Always get air into the confined space before you enter to work and maintain the ventilation until you have left the space.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 16 de 131

1

The sense of smell is reliable for evaluating the presence of dangerous gases.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 17 de 131

1

Moving parts that create a contact hazard to employees must be guarded.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 18 de 131

1

When applying protective coatings in a clarifier, you can create an atmospheric hazard.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 19 de 131

1

In the laboratory, separate flammable, explosive, or special hazard items for storage in an approved manner.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 20 de 131

1

Hard hats, safety footwear, eye protection, and hearing protection apply to all personnel in designated areas and specific jobs.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 21 de 131

1

When you are performing plant maintenance, you must recognize tasks that may be beyond your capabilities or repair facilities, and you should request assistance when needed.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 22 de 131

1

The horizontal pump suction piping slopes downward toward the pump.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 23 de 131

1

Fuses are used to protect operators, wiring, main circuits, branch circuits, heaters, and motors.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 24 de 131

1

Electric motors are the machines most commonly used to convert electrical energy into mechanical energy.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 25 de 131

1

Valves, elbows, and other items that could disrupt the flow ahead of a meter can upset the accuracy and reliability of a flowmeter

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 26 de 131

1

Safety is just as important in the laboratory as in the rest of the treatment plant.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 27 de 131

1

The shorter the time that elapses between sample collection and analysis, the more reliable will be the analytical results.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 28 de 131

1

The COD test is used to measure the strength of that are too toxic for the BOD test.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 29 de 131

1

Probably the most frequent use of computers is for word processing.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 30 de 131

1

Wastewater flows and other characteristics that can be sensed by instruments can be monitored by computers.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 31 de 131

1

When installing any computer program, be sure to check to see that it is doing what you expect it to do.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 32 de 131

1

Collection of data without analysis, interpretation, and use of results is a waste of time and money.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 33 de 131

1

Operators are likely to draw the line of best fit slightly differently as each operator will visualize a slightly different line (slope).

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 34 de 131

1

Well-kept records will make the task of writing treatment plant cost and efficiency reports much easier.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 35 de 131

1

Records at most wastewater treatment facilities are kept daily and summarized on a monthly basis.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 36 de 131

1

You and your plant operation are partially judged by the information contained in your report, its style, and its appearance.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 37 de 131

1

The utility manager must provide a safer, cleaner work environment while constantly training and retraining operators to understand new technologies

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 38 de 131

1

Establishing safe work procedures for new employees is a very important function of management.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 39 de 131

1

Good communication is an essential part of good management skills.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 40 de 131

1

Every utility needs an effective operations and maintenance program.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 41 de 131

1

The supervisor who has the responsibility for directing work activities must be safety conscious.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 42 de 131

1

operator must think, act, and promote safety if the utility is to achieve a good safety record.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 43 de 131

1

Why must the proper dissolved oxygen (DO) level be maintained in an aeration tank?

Selecione uma das seguintes:

  • So filamentous organisms will thrive and the sludge floc will settle properly

  • So pinpoint floc will develop and be removed by the secondary clarifier

  • So the contents of the aeration tank will be thoroughly mixed

  • So the solids will settle properly and the plant effluent will be clear

Explicação

Questão 44 de 131

1

Why should weirs installed at the outlet or effluent end of the aeration tank be level?

Selecione uma das seguintes:

  • To comply with the plant's plans and specifications

  • To keep the aeration tank balanced

  • To prevent short-circuiting and an uneven distribution of solids in the effluent

  • To provide a uniform appearing tank

Explicação

Questão 45 de 131

1

How can the mixed liquor suspended solids in the aeration tank be increased?

Selecione uma das seguintes:

  • By increasing the influent flows

  • By reducing the aeration tank capacity

  • By reducing the effluent flows

  • By reducing the sludge wasting rate

Explicação

Questão 46 de 131

1

What is bound water?

Selecione uma das seguintes:

  • A high-molecular-weight substance that is formed by either natural or synthetic processes

  • Clouds of billowing sludge that occur throughout secondary clarifiers and sludge thickeners when the sludge does not settle properly

  • The gathering together of fine particles after coagulation to form larger particles by a process of gentle mixing

  • Water contained within the cell mass of sludges or strongly held on the surface of colloidal particles

Explicação

Questão 47 de 131

1

What are raw sludge and scum?

Selecione uma das seguintes:

  • Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the aerators

  • Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the clarifiers

  • Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the digesters

  • Untreated solids and scum that are removed from the bar screens

Explicação

Questão 48 de 131

1

What is the purpose of a vacuum relief valve on an anaerobic sludge digester?

Selecione uma das seguintes:

  • Prevents a spark or flame from entering the digester

  • Prevents air from entering the digester or digester gas from escaping

  • Relieves excessive pressures in the digester so the water seal will not be blown out

  • Relieves excessive vacuums so the digester cover will not collapse

Explicação

Questão 49 de 131

1

Which item is the key to successful digester operation?

Selecione uma das seguintes:

  • pH

  • Recirculated sludge

  • Temperature

  • Volatile acid/alkalinity relationship

Explicação

Questão 50 de 131

1

Successful operation of a surface discharge system depends on which factor?

Selecione uma das seguintes:

  • Adequate budgets to meet the essential O & M requirements

  • All operators being properly certified

  • Conscientious operators using proper techniques for sampling and analysis

  • Qualified regulators understanding the plant's O & M requirements

Explicação

Questão 51 de 131

1

What type of emergency operating equipment should be available for pumped discharge systems when there is a loss of power?

Selecione uma das seguintes:

  • Standby generators

  • Standby monitors

  • Standby operators

  • Standby pumps

Explicação

Questão 52 de 131

1

What is a representative sample?

Selecione uma das seguintes:

  • A collection of individual samples obtained at regular intervals, usually every one or two hours during a 24-hour time span

  • A collection of samples combined with other samples in proportion to the rate of flow when the sample was collected

  • A sample portion of material, water, or wastestream that is as nearly identical in content and consistency as possible to that in the larger body being sampled

  • A single sample of water collected at a particular time and place that represents the composition of the water only at that time and place

Explicação

Questão 53 de 131

1

What is the best protection against the risk of infections and infectious diseases?

Selecione uma das seguintes:

  • Immunization program

  • Personal hygiene

  • Personal protective equipment (PPE)

  • Personnel safety courses

Explicação

Questão 54 de 131

1

What is the ideal method of dealing with any high-noise environment?

Selecione uma das seguintes:

  • The elimination or reduction of all sources through feasible engineering or administrative controls

  • The scheduling of work in the high-noise environment when the equipment is not operating

  • The selection of operators with a high level of noise tolerance to work in the high-noise environment

  • The use of generous compensation packages when loss of hearing results

Explicação

Questão 55 de 131

1

What is the apparent cause of drowning when someone falls into a diffused aeration tank?

Selecione uma das seguintes:

  • A strong undertow pulls the person under

  • The aerator is too deep for a person to stand on the bottom

  • The air in the water causes the person to sink to the bottom

  • There is nothing to grab hold of to keep afloat or to pull oneself out of the aerator

Explicação

Questão 56 de 131

1

If your hands may come in contact with wastewater or sludge during sampling, how can you prevent the spread of disease?

Selecione uma das seguintes:

  • Dry hands in the sunlight when you have finished sampling

  • Wear disposable, impervious gloves

  • Wear heavy leather gloves

  • Wear light, flexible, cotton gloves

Explicação

Questão 57 de 131

1

Which materials are consumed by a Class B fire?

Selecione uma das seguintes:

  • Combustible metals, such as magnesium, sodium, zinc, and potassium

  • Energized electrical equipment, such as starters, breakers, and motors

  • Flammable and combustible liquids, such as gasoline,oil, and grease

  • Ordinary combustibles, such as wood, paper, and cloth

Explicação

Questão 58 de 131

1

Why is a good maintenance program essential for a wastewater treatment plant?

Selecione uma das seguintes:

  • So operators can maintain their operator maintenance certificates

  • So operators will have time to conduct plant tours

  • To arrange for equipment vendors to observe their products

  • To operate continuously at peak design efficiency

Explicação

Questão 59 de 131

1

How can pipelines that carry chlorine gas be purged to remove moisture?

Selecione uma das seguintes:

  • By using cold water

  • By using dry air or nitrogen

  • By using methane gas

  • By using moist air

Explicação

Questão 60 de 131

1

Why do very few maintenance operators do the actual electrical repairs or troubleshooting?

Selecione uma das seguintes:

  • Because cost-effective training programs are rarely available for maintenance operators

  • Because highly trained technicians are readily available at a lower cost than maintenance operators

  • Because this is a highly specialized field and unqualified people can seriously injure themselves and
    damage costly equipment

  • Because union regulations and negotiations forbid maintenance operators from performing this work

Explicação

Questão 61 de 131

1

What is voltage? Voltage is

Selecione uma das seguintes:

  • A measure of power units used to rate electrical machines or motors or to indicate power in an electric circuit

  • A practical unit of electrical resistance

  • The electrical pressure available to cause a flow of current when an electric circuit is closed

  • The measurement of current or electron flow and is an indication of work being done

Explicação

Questão 62 de 131

1

What is a fuse?

Selecione uma das seguintes:

  • A device that allows a motor to be run continuously at its rated horsepower without causing damage to the insulation system

  • A protective device having a strip or wire of fusible metal which, when placed in a circuit, will melt and break the electric circuit when subjected to an excessive temperature

  • A switch that is opened automatically when the current or voltage exceeds or falls below a certain limit

  • An expression representing an electrical connection to earth or a large conductor that is at the earth's potential or neutral voltage

Explicação

Questão 63 de 131

1

When two or more pumps of the same size are installed, why should they be operated alternately?

Selecione uma das seguintes:

  • To ensure that all the pumps will fail simultaneously and can be replaced all at once

  • To equalize wear, keep the motor windings dry, and distribute lubricant in the bearings

  • To keep the load on the foundation and flow in the pipes balanced

  • To minimize electricity consumption and system electrical hazards

Explicação

Questão 64 de 131

1

What do flow measurement transmitter instruments do?

Selecione uma das seguintes:

  • Compare received signals with other values and send corrective or adjusting signals when necessary

  • Measure the variable flow indicator and convert this value to a usable number

  • Pick up the transmitted signal and convert it to a usable number

  • Send the flow variable to another device for conversion to a usable number

Explicação

Questão 65 de 131

1

Why should operators review the plans and specifications for pumps and lift stations?

Selecione uma das seguintes:

  • To be sure adequate provisions have been made for the station pumps, equipment, and instrumentation to be easily and properly operated and maintained

  • To review the plans and specifications to ensure receipt of low bids

  • To suggest contractors who could do an acceptable job

  • To verify and confirm the consulting engineers' calculations

Explicação

Questão 66 de 131

1

In chemistry, to what does normality (N) refer?

Selecione uma das seguintes:

  • Solution hazard

  • Solution strength

  • Solution toxicity

  • Solution volume

Explicação

Questão 67 de 131

1

What does the digester supernatant solids test measure?

Selecione uma das seguintes:

  • The degree of liquid-solids separation occurring when mixing is stopped in the digester

  • The effectiveness of the digester mixing procedures

  • The percent of settleable solids being returned to the plant headworks

  • The strength of the supernatant that is removed from the digester

Explicação

Questão 68 de 131

1

Why should chlorine residual be removed before final discharge to a receiving stream?

Selecione uma das seguintes:

  • For protection of aquatic vegetation from toxic chemicals

  • For protection of fish and other aquatic life

  • For protection of swimmers from skin rashes

  • For protection of water supplies from TTHMs

Explicação

Questão 69 de 131

1

What is aseptic?

Selecione uma das seguintes:

  • A plastic tube that contains an exact amount of chemical or reagent

  • A representative portion of a sample. Often, an equally divided portion of a sample

  • A solution or liquid whose chemical makeup neutralizes acids or bases without a great change in pH

  • Free from the living germs of disease, fermentation, or putrefaction. Sterile

Explicação

Questão 70 de 131

1

What is the first question an operator should ask when considering the possibility of using a computer or expanding the use of computers?

Selecione uma das seguintes:

  • How can I find a computer course to improve my computer skills?

  • How can I find funds in the budget to help me?

  • How can I get the computer staff to assist me?

  • How can I use a computer to help me do a better job?

Explicação

Questão 71 de 131

1

What does a SCADA system do?

Selecione uma das seguintes:

  • Collects, stores, and analyzes information about all aspects of O & M, transmits alarm signals when necessary, and allows fingertip control of alarms, equipment, and processes

  • Provides standby power to operate critical pumps when power systems fail

  • Scans plant facilities and reports unusual conditions to plant security

  • Surveys stakeholders and system users and reports

Explicação

Questão 72 de 131

1

What is the median?

Selecione uma das seguintes:

  • The difference between the largest and smallest measurement

  • The measurement that occurs most frequently

  • The middle measurement when the measurements are ranked in order of magnitude (size)

  • The sum of all measurements divided by the number of measurements.

Explicação

Questão 73 de 131

1

What is a normal distribution of data?

Selecione uma das seguintes:

  • The geometric mean describes the distribution

  • The mean, median, and mode values are different

  • The mean, median, and mode values will be be approximately the same

  • The percentile plotting points are different

Explicação

Questão 74 de 131

1

What is the main means by which operators who have information communicate with those who need it?

Selecione uma das seguintes:

  • Committee meetings

  • Professional conferences

  • Report writing

  • Telephones

Explicação

Questão 75 de 131

1

Recorded data should enable the operator to determine how to perform which task?

Selecione uma das seguintes:

  • Develop tailgate safety sessions

  • Operate and maintain the plant

  • Promote qualified operators

  • Schedule plant tours

Explicação

Questão 76 de 131

1

What is planning?

Selecione uma das seguintes:

  • Deciding who does what work and delegating authority to the appropriate operators

  • Determining the goals, policies, procedures, and other elements to achieve the goals and objectives of the agency

  • Guiding, teaching, motivating, and supervising operators and utility staff members

  • Taking the steps necessary to ensure that essential activities are performed so that objectives will be achieved as planned

Explicação

Questão 77 de 131

1

What is authority?

Selecione uma das seguintes:

  • Answering to those above in the chain of command to explain how and why you have used your authority

  • The act in which power is given to another person in the organization to accomplish a specific job

  • The power and resources to do a specific job or to get that job done

  • When a manager gives power or responsibility to an employee, the employee ensures that the manager is informed of results or events

Explicação

Questão 78 de 131

1

How do you measure financial stability for a utility?

Selecione uma das seguintes:

  • By calculating the benefit/cost ratio for the utility

  • By calculating the net revenue for the utility

  • By calculating the operating ratio and the coverage ratio

  • By calculating the rate of return on the utility's assets

Explicação

Questão 79 de 131

1

What is the operating ratio?

Selecione uma das seguintes:

  • A measure of the ability of the utility to pay the principal and interest on loans and bonds in addition to any unexpected expenses

  • A measure of the total revenues divided by the total operating expenses

  • The amount of money required annually to pay the interest on outstanding debts

  • The rate of return on the funds expended on facilities

Explicação

Questão 80 de 131

1

What is SCADA?

Selecione uma das seguintes:

  • A computer analytical system that continuously monitors water quality changes in the system

  • A computer budgeting system that records and monitors costs and revenues

  • A computer intelligence system that eliminates many tasks performed by operators

  • A computer-monitored alarm, response, control, and data acquisition system used to monitor and adjust the operation of equipment

Explicação

Questão 81 de 131

1

What is the purpose of a safety policy statement?

Selecione uma das seguintes:

  • To comply with OSHA regulations

  • To create the proper atmosphere to impress insurance companies

  • To let employees know that the safety program has the full support of the agency and its management

  • To let the media and the public know that the agency is safety conscious

Explicação

Questão 82 de 131

1

When wastewater enters an activated sludge plant, the preliminary treatment processes remove which pollutants?

Selecione uma ou mais das seguintes:

  • Coarse or heavy solids (grit)

  • Debris, such as roots, rags, and boards

  • Floatable and settleable material

  • Nutrients

  • Soluble or finely divided suspended materials

Explicação

Questão 83 de 131

1

Which items can cause an unsuitable environment for the activated sludge process?

Selecione uma ou mais das seguintes:

  • Failure to supply enough oxygen

  • High concentrations of acids, bases, and other toxic substances

  • Maintaining proper solids (floc mass) concentration in the aerator

  • Proper adjustment of the waste sludge pumping rate

  • Uneven flows of wastewater, which can cause overfeeding or starvation

Explicação

Questão 84 de 131

1

What information should be recorded when testing pumps?

Selecione uma ou mais das seguintes:

  • Date of the test

  • Location of the pump

  • Name of the operator

  • Pump discharge (flow)

  • Pump discharge pressure

Explicação

Questão 85 de 131

1

Which plant changes could cause an activated sludge plant to become upset?

Selecione uma ou mais das seguintes:

  • Changes in operators' shifts

  • Changes in the sampling program

  • Flow or waste changes

  • High solids in the digester supernatant

  • Temperature changes

Explicação

Questão 86 de 131

1

Which items are possible causes of sludge bulking?

Selecione uma ou mais das seguintes:

  • Filamentous organisms growing from one floc mass to another

  • Low DO

  • Low nutrient concentrations

  • Low pH

  • Production of a highly jelly-like, waterlogged sludge that has a very low sludge density

Explicação

Questão 87 de 131

1

Which items should be checked before starting a new sequencing batch reactor (SBR) plant?

Selecione uma ou mais das seguintes:

  • Be sure the plant has an up-to-date O & M manual and a set of as-built plans (record drawings)

  • Check and flush pipe systems and remove any refuse or debris left in them during construction

  • Ensure protective safety guards are installed on rotating equipment, open tanks, and channels

  • Make sure tanks are clean; be sure all debris, boards,ladders, and tools have been removed

  • To the extent possible, operate and test all equipment before admitting wastewater for treatment

Explicação

Questão 88 de 131

1

Operators can achieve good digester operation by controlling which items?

Selecione uma ou mais das seguintes:

  • Loading rate or food supply (organic solids)

  • Mixing

  • Reproduction rate of acid formers and methane fermenters

  • Temperature

  • Volatile acid/alkalinity relationship

Explicação

Questão 89 de 131

1

How can a scum blanket be controlled in a digester?

Selecione uma ou mais das seguintes:

  • By adequate mixing

  • By chemicals

  • By heat

  • By methane fermenters

  • By volatile acids

Explicação

Questão 90 de 131

1

Where does struvite scale sometimes form?

Selecione uma ou mais das seguintes:

  • In anaerobic digesters

  • In downstream chlorination equipment

  • In downstream digested sludge concentration equipment

  • In downstream digested sludge handling equipment

  • In downstream effluent weirs

Explicação

Questão 91 de 131

1

When operators are making their rounds inspecting their plant, they should be alert and investigate and record
which items? Anything that

Selecione uma ou mais das seguintes:

  • Feels different (hotter or vibrating more)

  • Looks different or unusual

  • Smells different

  • Sounds different

  • Tastes different

Explicação

Questão 92 de 131

1

What types of problems are encountered when operating aerobic digesters?

Selecione uma ou mais das seguintes:

  • Floating sludge

  • Fluctuating BODs

  • Odors

  • Scum

  • Wet solids

Explicação

Questão 93 de 131

1

When reviewing the specifications for sludge digestion and solids handling facilities, which items should operators check?

Selecione uma ou mais das seguintes:

  • Adequate supply of equipment operation and maintenance manuals

  • Equipment warranties and responsibility for acceptance testing

  • Instrumentation—remote and local control board items and recorders are provided

  • Paints and protective coatings

  • Performance requirements and capabilities

Explicação

Questão 94 de 131

1

Prior to discharge to surface waters, why must wastewater be treated?

Selecione uma ou mais das seguintes:

  • To prevent nuisances due to odors or unsightliness

  • To prevent the wastewater from interfering with the many uses of surface waters

  • To produce documentation for the record keeping system

  • To protect the health of the people who may come in contact with it

  • To provide water for discharge sampling and analysis

Explicação

Questão 95 de 131

1

Which operating procedures should be developed for the start-up of a plant?

Selecione uma ou mais das seguintes:

  • Inspect the discharge line, where possible

  • Look at the water surface over the diffuser or outfall pipe

  • Observe the flow entering the discharge system for visible pollutants

  • Open all appropriate valves

  • Start the pumps (unless it is a gravity system)

Explicação

Questão 96 de 131

1

Which items are probable causes of floatables in pond effluents?

Selecione uma ou mais das seguintes:

  • Excessive floatables and scum on the surface

  • Excessive solids accumulated on the bottom have gasified and floated to the surface

  • Excessive velocity or insufficient detention time

  • Outlet baffle is not at the proper location

  • Temperature or weather conditions may favor a particular species of algae

Explicação

Questão 97 de 131

1

Under what conditions may the frequency of sampling be increased?

Selecione uma ou mais das seguintes:

  • When the lab is not meeting QA/QC requirements

  • When the lab staff have the opportunity to analyze more samples

  • When the receiving waters are not meeting established water quality standards

  • When the treatment plant effluent is not meeting discharge requirements

  • When the treatment plant staff increases and more time is available to collect more samples

Explicação

Questão 98 de 131

1

A confined space may be defined as any space that meets Which conditions?

Selecione uma ou mais das seguintes:

  • Allows more than one employee to fit into the space and work

  • Has limited or restricted means for entry or exit

  • Is large enough and so configured that an employee can bodily enter and perform assigned work

  • Is not designed for continuous employee occupancy

  • Requires employees to wear personal protective equipment (PPE)

Explicação

Questão 99 de 131

1

The hazard warnings on containers of hazardous chemicals at your plant should contain emergency guide information on which specific categories?

Selecione uma ou mais das seguintes:

  • Flammability

  • Health

  • Nutrients

  • Permeability

  • Reactivity

Explicação

Questão 100 de 131

1

Which items could be included in your plant's fire prevention plan?

Selecione uma ou mais das seguintes:

  • Develop written response procedures for reacting to a fire situation, to include evacuation

  • Provide periodic cleanup of weeds or other vegetation in and around the plant

  • Provide required service on all fire detection and response equipment (inspection, service, hydrostatic

  • Regulate the use, storage, and disposal of all combustible materials/substances

  • Routinely inspect fire doors to ensure proper operation and unobstructed access

Explicação

Questão 101 de 131

1

The primary use for polymers in wastewater treatment is the conditioning of sludge to facilitate removal of water in
which subsequent treatment processes?

Selecione uma ou mais das seguintes:

  • Aerobic digesters

  • Belt filter presses

  • Centrifuges

  • Dissolved air flotation thickeners

  • Gravity belt thickeners

Explicação

Questão 102 de 131

1

Working safely in the laboratory involves which basic safety procedures and practices?

Selecione uma ou mais das seguintes:

  • Always check labels on bottles to make sure that the proper chemical is selected

  • Never handle chemicals with your bare hands

  • Never use laboratory glassware for a cup or food dish

  • Use care in making rubber-to-glass connections

  • Use proper safety goggles or a face shield in all tests where there is danger to the eyes

Explicação

Questão 103 de 131

1

Which paperwork items can be helpful in identifying the causes of accidents and developing corrective procedures?

Selecione uma ou mais das seguintes:

  • Accident report forms

  • Facility plans and specifications and plant inspection reports

  • Plant's safety policy

  • Plant's safety rules

  • Supervisors' guidelines on how to promote and implement a safety plan

Explicação

Questão 104 de 131

1

What could cause a pump to run dry?

Selecione uma ou mais das seguintes:

  • Excessive leakage when pumping against a high head

  • Holes (spacing) being too large in the suction intake screen

  • Impeller rotating too fast and causing cavitation

  • Lack of proper priming when starting

  • Loss of suction when operating

Explicação

Questão 105 de 131

1

Which items are primary sources of unsatisfactory AC brush and ring performance?

Selecione uma ou mais das seguintes:

  • Disturbing external condition

  • Improper load or service condition

  • Mechanical fault in the machine

  • Poor machine design

  • Poor preparation and care of the machine

Explicação

Questão 106 de 131

1

When performing pump station electrical equipment maintenance tasks, which items should be checked and inspected annually?

Selecione uma ou mais das seguintes:

  • All panel instruments

  • All switch gear and distribution equipment

  • Enclosures

  • Fuses and circuit breakers

  • Wiring integrity

Explicação

Questão 107 de 131

1

Which items are causes of motor malfunction or failure?

Selecione uma ou mais das seguintes:

  • Bearing failures

  • Contaminants

  • Old age

  • Overload (thermal)

  • Single phasing

Explicação

Questão 108 de 131

1

When troubleshooting any motor control that has developed trouble, the qualified maintenance operator should be able to do which of the following?

Selecione uma ou mais das seguintes:

  • Examine all unusual factors

  • Find the cause of the problem

  • Know what should happen when a switch is pushed

  • Make a visual inspection

  • Repair the problem and eliminate the cause, if possible

Explicação

Questão 109 de 131

1

Plugged pipelines are encountered in lines transporting which types of materials and liquids?

Selecione uma ou mais das seguintes:

  • Digested sludge

  • Effluent

  • Grit

  • Raw sludge

  • Scum

Explicação

Questão 110 de 131

1

Which factors will cause sludge lines to plug more often?

Selecione uma ou mais das seguintes:

  • When industrial wastes are discharged after a fine screening process

  • When plant effluent and reclaimed effluent are pumped through the lines

  • When RAS (return activated sludge) and WAS (waste activated sludge) are pumped through the lines

  • When scum and raw sludge are pumped through the same line

  • When stormwaters carry in grit and silt that are not effectively removed by the grit removal facilities

Explicação

Questão 111 de 131

1

When examining lift station prints, operators should ensure adequate provisions have been made for which items?

Selecione uma ou mais das seguintes:

  • Floors should be sloped to provide drainage, where needed, and drains should be located in low spots

  • Overhead clearances of power lines, trees, and roofs should be adequate for a crane to remove large equipment

  • The alarm system should signal high water levels in the wet well and water on the floor of the dry well

  • There should be room to use hydrolifts, cranes, and high-velocity cleaners, as needed

  • There should be sufficient room to set up portable pumping units or other necessary equipment in cases of major station failures or disasters

Explicação

Questão 112 de 131

1

When working with chemicals and other materials in the wastewater treatment plant laboratory, which hazards can
be minimized by using proper techniques and equipment?

Selecione uma ou mais das seguintes:

  • Burns

  • Electric shock

  • Infectious materials

  • Poisons

  • Toxic fumes

Explicação

Questão 113 de 131

1

Why must hydrogen sulfide gas be measured in the atmosphere?

Selecione uma ou mais das seguintes:

  • Because it causes corrosion

  • Because it causes odors

  • Because it increases the fuel value of sewer gas

  • Because it is flammable and explosive under certain conditions

  • Because it is toxic to your respiratory system

Explicação

Questão 114 de 131

1

Which precautions should be considered when measuring the chemical oxygen demand (COD) of a sample?

Selecione uma ou mais das seguintes:

  • Flasks and condensers should be clean and free from grease or other oxidizable materials

  • The standard ferrous ammonium sulfate solution is unstable and should be standardized daily

  • The wastewater sample should be well mixed

  • Use a wide-tip pipet to ensure a representative sample is added

  • Use extreme caution and safety precautions when handling the chemicals used for the test

Explicação

Questão 115 de 131

1

Which precautions should be considered when using a dissolved oxygen (DO) probe?

Selecione uma ou mais das seguintes:

  • Dissolved inorganic salts, such as found in seawater, can influence the readings from a probe

  • Do not place the probe directly over a diffuser because you want to measure the dissolved oxygen in the water being treated, not the oxygen in the air supply to the aerator

  • Keep the membrane in the tip of the probe from drying out

  • Periodically check the calibration of the probe

  • Reactive compounds, such as reactive gases and sulfur compounds, can interfere with the output of a probe

Explicação

Questão 116 de 131

1

Sulfate ions in wastewater are indirectly responsible for which serious problems?

Selecione uma ou mais das seguintes:

  • Indigestion

  • Laxative effects

  • Odor

  • Sewer corrosion problems

  • Toxic gas

Explicação

Questão 117 de 131

1

Which items are general types of computer applications in wastewater treatment plants??

Selecione uma ou mais das seguintes:

  • Communications

  • Data analysis

  • Recordkeeping

  • Report generation

  • Systems monitoring

Explicação

Questão 118 de 131

1

If the proper lab results are entered into the computer, the computer can calculate and print out which items?

Selecione uma ou mais das seguintes:

  • Chemical dosages

  • F/Ms (Food to Microorganism ratios)

  • MCRTs (Mean Cell Residence Times)

  • Percent removals

  • Suspended solids, BOD, or COD loadings

Explicação

Questão 119 de 131

1

Which programs are typically included in general purpose software packages?

Selecione uma ou mais das seguintes:

  • Database management

  • Graphics

  • Plant template

  • Spreadsheet

  • Word processing

Explicação

Questão 120 de 131

1

Which items can typically be monitored, recorded, and controlled by computers in a wastewater treatment plant?

Selecione uma ou mais das seguintes:

  • Aeration basin dissolved oxygen

  • Anaerobic sludge digester gas production

  • Chlorine contact time

  • Influent flow control gates and valves

  • Secondary clarifier sludge pumping

Explicação

Questão 121 de 131

1

When preparing to plot data in a bar graph, what information must first be determined?

Selecione uma ou mais das seguintes:

  • Class midpoint

  • Distribution of data

  • Measurement frequencies

  • Spread of data

  • Width of the class interval

Explicação

Questão 122 de 131

1

Why are records important?

Selecione uma ou mais das seguintes:

  • They are needed to fill unused space in storage rooms and filing cabinets

  • They are needed to show the type and frequency of maintenance and to evaluate the effectiveness of maintenance programs

  • They can indicate plant efficiency, performance, past problems, and potential problems

  • They can provide data upon which to base recommendations for modifying plant operation and facilities

  • They may be needed in damage suits brought against the district or municipality

Explicação

Questão 123 de 131

1

A list of the minimum daily records kept at a fairly large treatment plant with digester tanks may include which items?

Selecione uma ou mais das seguintes:

  • Chlorine use (lbs or kg)

  • Influent and effluent temperatures

  • pH of influent and effluent

  • Precipitation and air temperature

  • Raw wastewater flow (MGD from totalizer)

Explicação

Questão 124 de 131

1

Which items are basic principles common to good report writing?

Selecione uma ou mais das seguintes:

  • Know the purpose and objective of your report

  • Know your subject

  • Omit any recommendations

  • Organize the report to present your ideas in a logical order

  • Tailor your report to the person or persons to whom it is directed

Explicação

Questão 125 de 131

1

Which items are guidelines for preparing a report?

Selecione uma ou mais das seguintes:

  • Arrange the ideas in a logical sequence

  • Begin writing

  • Gather material needed to support the ideas to be presented in the report

  • List ideas and topics you plan to cover in the report

  • Prepare conclusions and recommendations after writing the main body of the report

Explicação

Questão 126 de 131

1

The utility manager's staffing responsibilities include which tasks?

Selecione uma ou mais das seguintes:

  • Evaluating employee performance

  • Issuing orders and instructions

  • Providing opportunities for advancement for operators and staff

  • Selecting and training employees

  • Teaching classes

Explicação

Questão 127 de 131

1

Which items are important steps in the process of hiring and selecting a new operator?

Selecione uma ou mais das seguintes:

  • Advertising the position

  • Avoiding unacceptable pre-employment inquiries

  • Interviewing applicants

  • Paper screening

  • Selecting the most qualified candidate

Explicação

Questão 128 de 131

1

Which items may serve as a guide for both the employee and the supervisor when dealing with a confrontation regarding employee performance issues?

Selecione uma ou mais das seguintes:

  • Aim for a permanent solution

  • Create a private environment

  • Keep your language appropriate

  • Listen very carefully

  • Maintain an adult approach

Explicação

Questão 129 de 131

1

The total revenue of a utility comes from revenue generated by which sources?

Selecione uma ou mais das seguintes:

  • Chemicals

  • Hook-up charges

  • Interest income

  • Taxes or assessments

  • User fees

Explicação

Questão 130 de 131

1

What is predictive maintenance?

Selecione uma ou mais das seguintes:

  • A method of establishing baseline performance data

  • Monitoring performance criteria over a period of time

  • Observing changes in performance so that failure can be predicted and maintenance can be performed on a planned, scheduled basis

  • The same as corrective maintenance

  • The same as proactive maintenance

Explicação

Questão 131 de 131

1

How can a supervisor be partially or fully responsible for an accident?

Selecione uma ou mais das seguintes:

  • By causing unsafe acts to take place

  • By disregarding an unsafe work environment

  • By overlooking or failing to consider any number of safety hazards

  • By requiring operators to follow safe procedures

  • By requiring work to be performed in haste

Explicação

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