Dean Lampman
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Wastewater Wastewater Treatment Study Material Test sobre Operation of Wastewater Treatment Plants Volume 2 Review, creado por Dean Lampman el 21/01/2018.

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Operation of Wastewater Treatment Plants Volume 2 Review

Operation of Wastewater Treatment Plants Volume 2 Review

Pregunta 1 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 2 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 6 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 8 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 9 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 11 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 12 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 13 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 14 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 16 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 17 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 18 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 19 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 20 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 22 de 131

1

The horizontal pump suction piping slopes downward toward the pump.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 23 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 24 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 26 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 27 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 28 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 29 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 30 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 32 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 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).

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 34 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 35 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 36 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 37 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 38 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 39 de 131

1

Good communication is an essential part of good management skills.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 40 de 131

1

Every utility needs an effective operations and maintenance program.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 41 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 42 de 131

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 43 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 44 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 45 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • By increasing the influent flows

  • By reducing the aeration tank capacity

  • By reducing the effluent flows

  • By reducing the sludge wasting rate

Explicación

Pregunta 46 de 131

1

What is bound water?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 47 de 131

1

What are raw sludge and scum?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 48 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 49 de 131

1

Which item is the key to successful digester operation?

Selecciona una de las siguientes respuestas posibles:

  • pH

  • Recirculated sludge

  • Temperature

  • Volatile acid/alkalinity relationship

Explicación

Pregunta 50 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 51 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • Standby generators

  • Standby monitors

  • Standby operators

  • Standby pumps

Explicación

Pregunta 52 de 131

1

What is a representative sample?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 53 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • Immunization program

  • Personal hygiene

  • Personal protective equipment (PPE)

  • Personnel safety courses

Explicación

Pregunta 54 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 55 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 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?

Selecciona una de las siguientes respuestas posibles:

  • Dry hands in the sunlight when you have finished sampling

  • Wear disposable, impervious gloves

  • Wear heavy leather gloves

  • Wear light, flexible, cotton gloves

Explicación

Pregunta 57 de 131

1

Which materials are consumed by a Class B fire?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 58 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 59 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • By using cold water

  • By using dry air or nitrogen

  • By using methane gas

  • By using moist air

Explicación

Pregunta 60 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 61 de 131

1

What is voltage? Voltage is

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 62 de 131

1

What is a fuse?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 63 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 64 de 131

1

What do flow measurement transmitter instruments do?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 65 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 66 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • Solution hazard

  • Solution strength

  • Solution toxicity

  • Solution volume

Explicación

Pregunta 67 de 131

1

What does the digester supernatant solids test measure?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 68 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 69 de 131

1

What is aseptic?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 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?

Selecciona una de las siguientes respuestas posibles:

  • 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?

Explicación

Pregunta 71 de 131

1

What does a SCADA system do?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 72 de 131

1

What is the median?

Selecciona una de las siguientes respuestas posibles:

  • 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.

Explicación

Pregunta 73 de 131

1

What is a normal distribution of data?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 74 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • Committee meetings

  • Professional conferences

  • Report writing

  • Telephones

Explicación

Pregunta 75 de 131

1

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

Selecciona una de las siguientes respuestas posibles:

  • Develop tailgate safety sessions

  • Operate and maintain the plant

  • Promote qualified operators

  • Schedule plant tours

Explicación

Pregunta 76 de 131

1

What is planning?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 77 de 131

1

What is authority?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 78 de 131

1

How do you measure financial stability for a utility?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 79 de 131

1

What is the operating ratio?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 80 de 131

1

What is SCADA?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 81 de 131

1

What is the purpose of a safety policy statement?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 82 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Coarse or heavy solids (grit)

  • Debris, such as roots, rags, and boards

  • Floatable and settleable material

  • Nutrients

  • Soluble or finely divided suspended materials

Explicación

Pregunta 83 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 84 de 131

1

What information should be recorded when testing pumps?

Selecciona una o más de las siguientes respuestas posibles:

  • Date of the test

  • Location of the pump

  • Name of the operator

  • Pump discharge (flow)

  • Pump discharge pressure

Explicación

Pregunta 85 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Changes in operators' shifts

  • Changes in the sampling program

  • Flow or waste changes

  • High solids in the digester supernatant

  • Temperature changes

Explicación

Pregunta 86 de 131

1

Which items are possible causes of sludge bulking?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 87 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 88 de 131

1

Operators can achieve good digester operation by controlling which items?

Selecciona una o más de las siguientes respuestas posibles:

  • Loading rate or food supply (organic solids)

  • Mixing

  • Reproduction rate of acid formers and methane fermenters

  • Temperature

  • Volatile acid/alkalinity relationship

Explicación

Pregunta 89 de 131

1

How can a scum blanket be controlled in a digester?

Selecciona una o más de las siguientes respuestas posibles:

  • By adequate mixing

  • By chemicals

  • By heat

  • By methane fermenters

  • By volatile acids

Explicación

Pregunta 90 de 131

1

Where does struvite scale sometimes form?

Selecciona una o más de las siguientes respuestas posibles:

  • In anaerobic digesters

  • In downstream chlorination equipment

  • In downstream digested sludge concentration equipment

  • In downstream digested sludge handling equipment

  • In downstream effluent weirs

Explicación

Pregunta 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

Selecciona una o más de las siguientes respuestas posibles:

  • Feels different (hotter or vibrating more)

  • Looks different or unusual

  • Smells different

  • Sounds different

  • Tastes different

Explicación

Pregunta 92 de 131

1

What types of problems are encountered when operating aerobic digesters?

Selecciona una o más de las siguientes respuestas posibles:

  • Floating sludge

  • Fluctuating BODs

  • Odors

  • Scum

  • Wet solids

Explicación

Pregunta 93 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 94 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 95 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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)

Explicación

Pregunta 96 de 131

1

Which items are probable causes of floatables in pond effluents?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 97 de 131

1

Under what conditions may the frequency of sampling be increased?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 98 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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)

Explicación

Pregunta 99 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Flammability

  • Health

  • Nutrients

  • Permeability

  • Reactivity

Explicación

Pregunta 100 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 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?

Selecciona una o más de las siguientes respuestas posibles:

  • Aerobic digesters

  • Belt filter presses

  • Centrifuges

  • Dissolved air flotation thickeners

  • Gravity belt thickeners

Explicación

Pregunta 102 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 103 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 104 de 131

1

What could cause a pump to run dry?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 105 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Disturbing external condition

  • Improper load or service condition

  • Mechanical fault in the machine

  • Poor machine design

  • Poor preparation and care of the machine

Explicación

Pregunta 106 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • All panel instruments

  • All switch gear and distribution equipment

  • Enclosures

  • Fuses and circuit breakers

  • Wiring integrity

Explicación

Pregunta 107 de 131

1

Which items are causes of motor malfunction or failure?

Selecciona una o más de las siguientes respuestas posibles:

  • Bearing failures

  • Contaminants

  • Old age

  • Overload (thermal)

  • Single phasing

Explicación

Pregunta 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?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 109 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Digested sludge

  • Effluent

  • Grit

  • Raw sludge

  • Scum

Explicación

Pregunta 110 de 131

1

Which factors will cause sludge lines to plug more often?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 111 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 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?

Selecciona una o más de las siguientes respuestas posibles:

  • Burns

  • Electric shock

  • Infectious materials

  • Poisons

  • Toxic fumes

Explicación

Pregunta 113 de 131

1

Why must hydrogen sulfide gas be measured in the atmosphere?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 114 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 115 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 116 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Indigestion

  • Laxative effects

  • Odor

  • Sewer corrosion problems

  • Toxic gas

Explicación

Pregunta 117 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Communications

  • Data analysis

  • Recordkeeping

  • Report generation

  • Systems monitoring

Explicación

Pregunta 118 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Chemical dosages

  • F/Ms (Food to Microorganism ratios)

  • MCRTs (Mean Cell Residence Times)

  • Percent removals

  • Suspended solids, BOD, or COD loadings

Explicación

Pregunta 119 de 131

1

Which programs are typically included in general purpose software packages?

Selecciona una o más de las siguientes respuestas posibles:

  • Database management

  • Graphics

  • Plant template

  • Spreadsheet

  • Word processing

Explicación

Pregunta 120 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Aeration basin dissolved oxygen

  • Anaerobic sludge digester gas production

  • Chlorine contact time

  • Influent flow control gates and valves

  • Secondary clarifier sludge pumping

Explicación

Pregunta 121 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Class midpoint

  • Distribution of data

  • Measurement frequencies

  • Spread of data

  • Width of the class interval

Explicación

Pregunta 122 de 131

1

Why are records important?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 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?

Selecciona una o más de las siguientes respuestas posibles:

  • Chlorine use (lbs or kg)

  • Influent and effluent temperatures

  • pH of influent and effluent

  • Precipitation and air temperature

  • Raw wastewater flow (MGD from totalizer)

Explicación

Pregunta 124 de 131

1

Which items are basic principles common to good report writing?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 125 de 131

1

Which items are guidelines for preparing a report?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 126 de 131

1

The utility manager's staffing responsibilities include which tasks?

Selecciona una o más de las siguientes respuestas posibles:

  • Evaluating employee performance

  • Issuing orders and instructions

  • Providing opportunities for advancement for operators and staff

  • Selecting and training employees

  • Teaching classes

Explicación

Pregunta 127 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Advertising the position

  • Avoiding unacceptable pre-employment inquiries

  • Interviewing applicants

  • Paper screening

  • Selecting the most qualified candidate

Explicación

Pregunta 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?

Selecciona una o más de las siguientes respuestas posibles:

  • Aim for a permanent solution

  • Create a private environment

  • Keep your language appropriate

  • Listen very carefully

  • Maintain an adult approach

Explicación

Pregunta 129 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Chemicals

  • Hook-up charges

  • Interest income

  • Taxes or assessments

  • User fees

Explicación

Pregunta 130 de 131

1

What is predictive maintenance?

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 131 de 131

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • 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

Explicación

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