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Operation of Wastewater Treatment Plants Volume 2 Review

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Wastewater Wastewater Treatment Study Material Quiz on Operation of Wastewater Treatment Plants Volume 2 Review, created by Dean Lampman on 21/01/2018.
Dean Lampman
Quiz by Dean Lampman, updated more than 1 year ago
Dean Lampman
Created by Dean Lampman over 6 years ago
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Resource summary

Question 1

Question
In the activated sludge process, the oxidation may be by chemical or biological processes.
Answer
  • True
  • False

Question 2

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

Question 3

Question
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.
Answer
  • True
  • False

Question 4

Question
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.
Answer
  • True
  • False

Question 5

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

Question 6

Question
Microbiology is another tool for operators to use in controlling the activated sludge process.
Answer
  • True
  • False

Question 7

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

Question 8

Question
Mixing is very important in a digester because it greatly speeds up the digestion rate.
Answer
  • True
  • False

Question 9

Question
Operators should make every effort to pump as thick a sludge to the digester as possible.
Answer
  • True
  • False

Question 10

Question
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.
Answer
  • True
  • False

Question 11

Question
Aerobic sludge digestion completes the oxidation of volatile materials in the digester.
Answer
  • True
  • False

Question 12

Question
The proper discharge of plant effluent is the final process for the operator.
Answer
  • True
  • False

Question 13

Question
The principles for collecting samples for measuring dissolved oxygen are the same as for measuring temperature.
Answer
  • True
  • False

Question 14

Question
Site-specific safety procedures should be confirmed with your local safety regulatory agency.
Answer
  • True
  • False

Question 15

Question
Always get air into the confined space before you enter to work and maintain the ventilation until you have left the space.
Answer
  • True
  • False

Question 16

Question
The sense of smell is reliable for evaluating the presence of dangerous gases.
Answer
  • True
  • False

Question 17

Question
Moving parts that create a contact hazard to employees must be guarded.
Answer
  • True
  • False

Question 18

Question
When applying protective coatings in a clarifier, you can create an atmospheric hazard.
Answer
  • True
  • False

Question 19

Question
In the laboratory, separate flammable, explosive, or special hazard items for storage in an approved manner.
Answer
  • True
  • False

Question 20

Question
Hard hats, safety footwear, eye protection, and hearing protection apply to all personnel in designated areas and specific jobs.
Answer
  • True
  • False

Question 21

Question
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.
Answer
  • True
  • False

Question 22

Question
The horizontal pump suction piping slopes downward toward the pump.
Answer
  • True
  • False

Question 23

Question
Fuses are used to protect operators, wiring, main circuits, branch circuits, heaters, and motors.
Answer
  • True
  • False

Question 24

Question
Electric motors are the machines most commonly used to convert electrical energy into mechanical energy.
Answer
  • True
  • False

Question 25

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

Question 26

Question
Safety is just as important in the laboratory as in the rest of the treatment plant.
Answer
  • True
  • False

Question 27

Question
The shorter the time that elapses between sample collection and analysis, the more reliable will be the analytical results.
Answer
  • True
  • False

Question 28

Question
The COD test is used to measure the strength of that are too toxic for the BOD test.
Answer
  • True
  • False

Question 29

Question
Probably the most frequent use of computers is for word processing.
Answer
  • True
  • False

Question 30

Question
Wastewater flows and other characteristics that can be sensed by instruments can be monitored by computers.
Answer
  • True
  • False

Question 31

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

Question 32

Question
Collection of data without analysis, interpretation, and use of results is a waste of time and money.
Answer
  • True
  • False

Question 33

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

Question 34

Question
Well-kept records will make the task of writing treatment plant cost and efficiency reports much easier.
Answer
  • True
  • False

Question 35

Question
Records at most wastewater treatment facilities are kept daily and summarized on a monthly basis.
Answer
  • True
  • False

Question 36

Question
You and your plant operation are partially judged by the information contained in your report, its style, and its appearance.
Answer
  • True
  • False

Question 37

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

Question 38

Question
Establishing safe work procedures for new employees is a very important function of management.
Answer
  • True
  • False

Question 39

Question
Good communication is an essential part of good management skills.
Answer
  • True
  • False

Question 40

Question
Every utility needs an effective operations and maintenance program.
Answer
  • True
  • False

Question 41

Question
The supervisor who has the responsibility for directing work activities must be safety conscious.
Answer
  • True
  • False

Question 42

Question
operator must think, act, and promote safety if the utility is to achieve a good safety record.
Answer
  • True
  • False

Question 43

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

Question 44

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

Question 45

Question
How can the mixed liquor suspended solids in the aeration tank be increased?
Answer
  • By increasing the influent flows
  • By reducing the aeration tank capacity
  • By reducing the effluent flows
  • By reducing the sludge wasting rate

Question 46

Question
What is bound water?
Answer
  • 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

Question 47

Question
What are raw sludge and scum?
Answer
  • 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

Question 48

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

Question 49

Question
Which item is the key to successful digester operation?
Answer
  • pH
  • Recirculated sludge
  • Temperature
  • Volatile acid/alkalinity relationship

Question 50

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

Question 51

Question
What type of emergency operating equipment should be available for pumped discharge systems when there is a loss of power?
Answer
  • Standby generators
  • Standby monitors
  • Standby operators
  • Standby pumps

Question 52

Question
What is a representative sample?
Answer
  • 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

Question 53

Question
What is the best protection against the risk of infections and infectious diseases?
Answer
  • Immunization program
  • Personal hygiene
  • Personal protective equipment (PPE)
  • Personnel safety courses

Question 54

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

Question 55

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

Question 56

Question
If your hands may come in contact with wastewater or sludge during sampling, how can you prevent the spread of disease?
Answer
  • Dry hands in the sunlight when you have finished sampling
  • Wear disposable, impervious gloves
  • Wear heavy leather gloves
  • Wear light, flexible, cotton gloves

Question 57

Question
Which materials are consumed by a Class B fire?
Answer
  • 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

Question 58

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

Question 59

Question
How can pipelines that carry chlorine gas be purged to remove moisture?
Answer
  • By using cold water
  • By using dry air or nitrogen
  • By using methane gas
  • By using moist air

Question 60

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

Question 61

Question
What is voltage? Voltage is
Answer
  • 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

Question 62

Question
What is a fuse?
Answer
  • 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

Question 63

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

Question 64

Question
What do flow measurement transmitter instruments do?
Answer
  • 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

Question 65

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

Question 66

Question
In chemistry, to what does normality (N) refer?
Answer
  • Solution hazard
  • Solution strength
  • Solution toxicity
  • Solution volume

Question 67

Question
What does the digester supernatant solids test measure?
Answer
  • 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

Question 68

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

Question 69

Question
What is aseptic?
Answer
  • 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

Question 70

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

Question 71

Question
What does a SCADA system do?
Answer
  • 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

Question 72

Question
What is the median?
Answer
  • 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.

Question 73

Question
What is a normal distribution of data?
Answer
  • 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

Question 74

Question
What is the main means by which operators who have information communicate with those who need it?
Answer
  • Committee meetings
  • Professional conferences
  • Report writing
  • Telephones

Question 75

Question
Recorded data should enable the operator to determine how to perform which task?
Answer
  • Develop tailgate safety sessions
  • Operate and maintain the plant
  • Promote qualified operators
  • Schedule plant tours

Question 76

Question
What is planning?
Answer
  • 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

Question 77

Question
What is authority?
Answer
  • 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

Question 78

Question
How do you measure financial stability for a utility?
Answer
  • 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

Question 79

Question
What is the operating ratio?
Answer
  • 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

Question 80

Question
What is SCADA?
Answer
  • 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

Question 81

Question
What is the purpose of a safety policy statement?
Answer
  • 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

Question 82

Question
When wastewater enters an activated sludge plant, the preliminary treatment processes remove which pollutants?
Answer
  • Coarse or heavy solids (grit)
  • Debris, such as roots, rags, and boards
  • Floatable and settleable material
  • Nutrients
  • Soluble or finely divided suspended materials

Question 83

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

Question 84

Question
What information should be recorded when testing pumps?
Answer
  • Date of the test
  • Location of the pump
  • Name of the operator
  • Pump discharge (flow)
  • Pump discharge pressure

Question 85

Question
Which plant changes could cause an activated sludge plant to become upset?
Answer
  • Changes in operators' shifts
  • Changes in the sampling program
  • Flow or waste changes
  • High solids in the digester supernatant
  • Temperature changes

Question 86

Question
Which items are possible causes of sludge bulking?
Answer
  • 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

Question 87

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

Question 88

Question
Operators can achieve good digester operation by controlling which items?
Answer
  • Loading rate or food supply (organic solids)
  • Mixing
  • Reproduction rate of acid formers and methane fermenters
  • Temperature
  • Volatile acid/alkalinity relationship

Question 89

Question
How can a scum blanket be controlled in a digester?
Answer
  • By adequate mixing
  • By chemicals
  • By heat
  • By methane fermenters
  • By volatile acids

Question 90

Question
Where does struvite scale sometimes form?
Answer
  • In anaerobic digesters
  • In downstream chlorination equipment
  • In downstream digested sludge concentration equipment
  • In downstream digested sludge handling equipment
  • In downstream effluent weirs

Question 91

Question
When operators are making their rounds inspecting their plant, they should be alert and investigate and record which items? Anything that
Answer
  • Feels different (hotter or vibrating more)
  • Looks different or unusual
  • Smells different
  • Sounds different
  • Tastes different

Question 92

Question
What types of problems are encountered when operating aerobic digesters?
Answer
  • Floating sludge
  • Fluctuating BODs
  • Odors
  • Scum
  • Wet solids

Question 93

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

Question 94

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

Question 95

Question
Which operating procedures should be developed for the start-up of a plant?
Answer
  • 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)

Question 96

Question
Which items are probable causes of floatables in pond effluents?
Answer
  • 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

Question 97

Question
Under what conditions may the frequency of sampling be increased?
Answer
  • 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

Question 98

Question
A confined space may be defined as any space that meets Which conditions?
Answer
  • 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)

Question 99

Question
The hazard warnings on containers of hazardous chemicals at your plant should contain emergency guide information on which specific categories?
Answer
  • Flammability
  • Health
  • Nutrients
  • Permeability
  • Reactivity

Question 100

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

Question 101

Question
The primary use for polymers in wastewater treatment is the conditioning of sludge to facilitate removal of water in which subsequent treatment processes?
Answer
  • Aerobic digesters
  • Belt filter presses
  • Centrifuges
  • Dissolved air flotation thickeners
  • Gravity belt thickeners

Question 102

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

Question 103

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

Question 104

Question
What could cause a pump to run dry?
Answer
  • 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

Question 105

Question
Which items are primary sources of unsatisfactory AC brush and ring performance?
Answer
  • Disturbing external condition
  • Improper load or service condition
  • Mechanical fault in the machine
  • Poor machine design
  • Poor preparation and care of the machine

Question 106

Question
When performing pump station electrical equipment maintenance tasks, which items should be checked and inspected annually?
Answer
  • All panel instruments
  • All switch gear and distribution equipment
  • Enclosures
  • Fuses and circuit breakers
  • Wiring integrity

Question 107

Question
Which items are causes of motor malfunction or failure?
Answer
  • Bearing failures
  • Contaminants
  • Old age
  • Overload (thermal)
  • Single phasing

Question 108

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

Question 109

Question
Plugged pipelines are encountered in lines transporting which types of materials and liquids?
Answer
  • Digested sludge
  • Effluent
  • Grit
  • Raw sludge
  • Scum

Question 110

Question
Which factors will cause sludge lines to plug more often?
Answer
  • 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

Question 111

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

Question 112

Question
When working with chemicals and other materials in the wastewater treatment plant laboratory, which hazards can be minimized by using proper techniques and equipment?
Answer
  • Burns
  • Electric shock
  • Infectious materials
  • Poisons
  • Toxic fumes

Question 113

Question
Why must hydrogen sulfide gas be measured in the atmosphere?
Answer
  • 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

Question 114

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

Question 115

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

Question 116

Question
Sulfate ions in wastewater are indirectly responsible for which serious problems?
Answer
  • Indigestion
  • Laxative effects
  • Odor
  • Sewer corrosion problems
  • Toxic gas

Question 117

Question
Which items are general types of computer applications in wastewater treatment plants??
Answer
  • Communications
  • Data analysis
  • Recordkeeping
  • Report generation
  • Systems monitoring

Question 118

Question
If the proper lab results are entered into the computer, the computer can calculate and print out which items?
Answer
  • Chemical dosages
  • F/Ms (Food to Microorganism ratios)
  • MCRTs (Mean Cell Residence Times)
  • Percent removals
  • Suspended solids, BOD, or COD loadings

Question 119

Question
Which programs are typically included in general purpose software packages?
Answer
  • Database management
  • Graphics
  • Plant template
  • Spreadsheet
  • Word processing

Question 120

Question
Which items can typically be monitored, recorded, and controlled by computers in a wastewater treatment plant?
Answer
  • Aeration basin dissolved oxygen
  • Anaerobic sludge digester gas production
  • Chlorine contact time
  • Influent flow control gates and valves
  • Secondary clarifier sludge pumping

Question 121

Question
When preparing to plot data in a bar graph, what information must first be determined?
Answer
  • Class midpoint
  • Distribution of data
  • Measurement frequencies
  • Spread of data
  • Width of the class interval

Question 122

Question
Why are records important?
Answer
  • 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

Question 123

Question
A list of the minimum daily records kept at a fairly large treatment plant with digester tanks may include which items?
Answer
  • Chlorine use (lbs or kg)
  • Influent and effluent temperatures
  • pH of influent and effluent
  • Precipitation and air temperature
  • Raw wastewater flow (MGD from totalizer)

Question 124

Question
Which items are basic principles common to good report writing?
Answer
  • 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

Question 125

Question
Which items are guidelines for preparing a report?
Answer
  • 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

Question 126

Question
The utility manager's staffing responsibilities include which tasks?
Answer
  • Evaluating employee performance
  • Issuing orders and instructions
  • Providing opportunities for advancement for operators and staff
  • Selecting and training employees
  • Teaching classes

Question 127

Question
Which items are important steps in the process of hiring and selecting a new operator?
Answer
  • Advertising the position
  • Avoiding unacceptable pre-employment inquiries
  • Interviewing applicants
  • Paper screening
  • Selecting the most qualified candidate

Question 128

Question
Which items may serve as a guide for both the employee and the supervisor when dealing with a confrontation regarding employee performance issues?
Answer
  • Aim for a permanent solution
  • Create a private environment
  • Keep your language appropriate
  • Listen very carefully
  • Maintain an adult approach

Question 129

Question
The total revenue of a utility comes from revenue generated by which sources?
Answer
  • Chemicals
  • Hook-up charges
  • Interest income
  • Taxes or assessments
  • User fees

Question 130

Question
What is predictive maintenance?
Answer
  • 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

Question 131

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