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67 Cards in this Set
- Front
- Back
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In the activated sludge process, the oxidation may be by chemical or biological process?
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True
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The removal of organisms from the activated sludge treatment process (sludge wasting) is very important control technique.
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True
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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
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False - In an air distribution system, an air metering device should be located in a straight section of the air main on the discharge ( NOT SUCTION) side of the blower |
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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.
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False - In an aeration tank, the higher the food to microorganism (F/M) ratio, the more food and therefore a higher (NOT LOWER) dissolved oxygen (DO) is needed.
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When considering a major process change, first review the plant data and then make only one major change at a time
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True
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Microbiology is another tool for operators to use in controlling the activated sludge process
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True |
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The psychrophilic bacteria in anaerobic digesters appear to be able to survive temperatures well below freezing with little to no harm.
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True
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Mixing is very important in a digester because it greatly speeds up the digestive rate
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True
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Operators should make every effort to pump as thick a sludge to the digester as possible
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True
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The withdrawal rate of sludge from a digester should be faster than a rate at which gas production from the system is able to maintain a positive pressure
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False - The withdrawal rate of sludge from a digester should NOT be faster than a rate at which gas production from the system is able to maintain a positive pressure
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Aerobic sludge digestion completes the oxidation of volatile materials in the digester
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False - Aerobic digestion does NOT complete the oxidation of volatile materials in the digester
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The proper discharge of plant effluent is the final process for the operator
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True
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The principles for collecting samples for measuring dissolved oxygen are the same as for measuring temperature
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True
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Site - Specific safety procedures should be confirmed with your local safety regulatory agency
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True
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Always get air into the confined space before you enter to work and maintain the ventilation until you have left the space.
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True
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The sense of smell is reliable for evaluating the presence of dangerous gasses.
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False - The sense of smell is absolutely UNRELIABLE for evaluating the presence of dangerous gasses.
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Moving parts that create a contact hazard to employees must be grounded
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True
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When applying protective coatings in a clarifier, you can create an atmospheric hazard
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True
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In the laboratory, separate flammable, explosive, or special hazard items for storage in an approved manner.
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True
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Hard hats, safety footwear, eye protection, and hearing protection apply to all personnel in designated areas and specific jobs.
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True
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When you are preforming plant maintenance, you must recognize tasks that may be beyond your capabilities or repair facilities, and you should request assistance when needed. |
True
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The horizontal pump suction piping slopes downward toward the pump
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False - The horizontal pump suction piping slopes UPWARD ( NOT downward) toward the pump
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Fuses are used to protect operators, wiring, main circuits, branch circuits, heaters, and motors.
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True
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Electric motors are the machines most commonly used to convert electrical energy into mechanical energy
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True
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Valves, elbows, and other items that could disrupt the flow ahead of a meter can upset the accuracy and reliability of a flow meter.
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True
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Safety is just as important in the laboratory as in the rest of the treatment plant.
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True
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The shorter the time that elapses between sample collection and analysis, the more reliable will be the analytical results
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True
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The COD test is used to measure the strength of wastes that are too toxic for the BOD test
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True
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Probably the most frequent use of computers is for word processing
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True
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Wastewater flows and other characteristics that can be sensed by instruments can be monitored by computers.
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True
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When installing any computer program, be sure to check to see that it is doing what you expect it to do.
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True
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Collection of data without analysis, interpretation, and use of results is a waste of time and money
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True
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Operators are likely to draw the line of best fit slightly different as each operator will visualize a slightly different line (Slope)
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True
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Well kept records will make the task of writing treatment plant costs and efficiency reports much easier
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True
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Record at most wastewater treatment facilities are kept daily and summarized on a monthly basis.
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True
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You and your plant operation are partially judged by the information contained in your report, its style, and its appearance
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True
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The utility manager must provide a safer, cleaner work environment while constantly training and retraining operators to understand new technologies
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True
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Establishing safe work procedures for new employees is a very important function of management |
True
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Good communication is an essential part of good management skills
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True
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Every utility needs an effective operations and maintenance program
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True
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The supervisory who has the responsibility for directing work activities must be safety conscious
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True
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Each operator must think, act, and promote safety if the utility is to achieve a good safety record.
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True
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Why must the proper dissolved oxygen (DO) level be maintained in an aeration tank? 1. So filamentous organisms will thrive and the sludge floc will settle properly 2. So pinfloc will develop and be removed by the secondary clarifier 3. So the contents of the aeration tank will be thoroughly mixed 4. So the solids will settle properly and the plant effluent will be clear |
4. The proper dissolved oxygen (DO) level must be maintained in an aeration tank so the solids will settle properly and the plant effluent will be clear |
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Why should weirs be installed at the outlet or effluent end of the aeration tank be level? 1. To comply with the plants plans and specifications 2. To keep the aeration tank balanced 3. to prevent short-circuiting and an uneven distribution of solids in the effluent 4. To provide an uniform appearing tank |
3. Weirs installed at the outlet or effluent end of the aeration tank should be level to prevent short-circuiting and an uneven distribution of solids in the effluent
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How can mixed liquor suspended solids in the aeration tank be increased? 1. By increasing the influent flows 2. By reducing the aeration tank capacity 3. By reducing the effluent flows 4. By reducing the sludge wasting rate |
4. The mixed liquor suspended solids in the aeration tank can be increased by reducing the sludge wasting rate
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What is bound water? 1. A high molecular weight substance that is formed by either natural or synthetic processes 2. Clouds of billowing sludge that occur through secondary clarifiers and sludge thickeners when sludge does not settle properly 3. The gathering together of fine particles after coagulation to form larger particles by the process of gentle mixing 4. Water contained within the cell mass of sludge or strongly held on the surface of colloidal particles |
4. Bound water is water contained within the cell mass of sludge or strongly held on the surface of colloidal particles
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What are raw scum and sludge? 1. Settled sludge solids that are removed from the bottom and the floating scum removed from the top of aerators 2. Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the clarifiers 3. Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the digesters 4. untreated solids and scum that are removed from the bar screen |
2. Raw scum and sludge is the settled sludge solids that are removed from the bottom and the floating scum removed from the top of the clarifiers
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What is the purpose of a vacuum relief valve on an anaerobic sludge digester? 1. Prevents a spark or flame from entering the digester 2. Prevents air from entering the digester or digester gas from escaping 3. Relieves excessive pressure in the digester so the water seal will not be blow out 4. Relieves excessive vacuums so the digester cover will not collapse |
4. The purpose of a vacuum relief valve on an anaerobic sludge digester is to relieve excessive vacuums so the digester cover will not collapse
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Which item is the key to successful digester operation? 1. pH 2. Recirculated sludge 3. Temp 4. Volatile acid/alkalinity relationship |
4. Volatile acid/alkalinity relationship is the key to successful digester operation
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Successful operation of a surface discharge system depends on which factor? 1. Adequate budgets to meet the essential O & M requirements 2. All operators being properly certified 3. conscientious operators using proper techniques for sampling and analysis 4. Qualified regulators understanding the plants O & M requirements |
3. Successful operation of a surface discharge system depends on conscientious operators using proper techniques for sampling and analysis
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What type of emergency operating equipment should be available for pumped discharge systems when there is a loss of power? 1. Standby generators 2. Standby monitors 3. Standby operators 4. Standby pumps |
1. pumped discharge systems should have standby generators available for emergency operation when there is a loss of power
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What is a representative sample? 1. A collection of individual samples obtained at regular intervals, usually every one or two hours during a 24 hour time span 2. A collection of samples combined with other samples in a proportion to the rate of flow when the sample was collected 3. A sample portion of material, water, or waste stream that is as nearly identical in content and consistency as possible to that in the larger body being sampled 4. A single sample of water collected at a particular time and place that represents the composition of the water at that time and place |
3. A representative sample is a sample portion of material, water, or waste stream that is as nearly identical in content and consistency as possible to that in the larger body being sampled
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What is the best protection against the risk of infections and infectious diseases? 1. Immunization program 2. Personal hygiene 3. PPE 4. Personnel safety courses |
2. Personal hygiene is the best protection against the risk of infections and infectious diseases
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Which materials are consumed by Class B fire? 1. Combustible metals 2. Energized electrical equipment 3. Flammable com combustible liquids 4. Ordinary combustibles |
3
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What is voltage? 1. A measure of power units used to rate electrical machines or motors or to indicate power in an electrical circuit 2. A Practical unit of electrical resistance 3. The electrical pressure available to cause a flow of current when an electric circuit is closed 4. The measurement of current or electron flow and is an indication of work being done |
3
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What is a fuse? 1. A device that allows a motor to be run continuously at its rated horsepower without causing damage to the insulation system 2. A protective device having a strip or wire of fusible metal which, when placed in a circuit, will melt and break the electrical circuit when subjected to an excessive temp 3. A switch that is opened automatically when the current or voltage exceeds or falls below a certain limit |
2
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Wastewater Review Volume II
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What do flow measurement transmitter instruments do? 1. Compare received signals with other values and send corrective or adjusting signals when necessary 2. Measure the variable flow indicator and convert it to a usable number 3. Pick up the transmitted signal and convert it to a usable number 4. Send the flow variable to another device for conversion to a usable number |
4
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What does the digester supernatant solids test measure? 1. The degree of liquid - solids separation occurring when mixing is stopped in the digester 2. the effectiveness of the digester mixing procedures 3. The percent of settleable solids being returned to the plant headoworks 4. The strength of the supernatant that is removed from the digester |
3
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When wastewater enters an activated sludge plant, the preliminary processes remove which pollutants? 1. Grit 2. Debris 3. Floatable and settleable material 4. Nutrients 5. Soluble or finely divided suspended materials |
1 & 2
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Which items can cause an unsuitable environment for the activated sludge process? 1. Failure to supply enough oxygen 2. High concentrations of acids, bases, and other toxic substances 3. Maintaining proper solids (floc mass) concentration in the aerator 4. Proper adjustment of the waste sludge pumping rate 5. Uneven flows of wastewater, which can cause overfeeding and or starvation |
1, 2, 5
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What information should be recorded when testing pumps? 1. Date of the test 2. Location of the pump 3. Name of the operator 4. Pump Flow (discharge) 5. Pump discharge pressure |
All
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Which plant changes could cause an activated sludge plant to become upset? 1. Changes in operators shifts 2. changes in the sampling program 3. flow or waste changes 4. high solids in the digester supernatant 5. temp changes |
2, 3, 4 & 5
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Which items are possible causes of sludge bulking? 1. Filamentous organisms growing from one floc mass to another 2. Low DO 3. Low nutrient concentrations 4. Low pH 5. Production of highly jelly-like, waterlogged sludge that has a very low sludge density |
All
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Operators can achieve good digester operation by controlling which items? 1. Loading rate of food supply (organic solids) 2. Mixing 3. Reproduction rate of acid formers and methane fermenters 4. Temp 5. Volatile acid/alkalinity relationship |
1,2,4, & 5
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How can scum blanket be controlled in a digester? 1. By adequate mixing 2. By Chemicals 3. By heat 4. By methane fermenters 5. By volatile acids |
1 & 3
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What could cause a pump to run dry? 1. Excessive leakage when pumping against a high head 2. Holes (spacing) being too large in the section intake screen 3. Impeller rotating to fast and causing cavitation 4. Lack of proper priming when starting 5. Loss of suction when operating |
4 & 5
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