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201 Cards in this Set
- Front
- Back
What is the maximum hold time for a COD sample? |
28 days |
|
What is the maximum hold time for a fecal Coliform sample? |
6 hours |
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What kind of valve is used for a lime slurry? |
Ball valve |
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What kind of valve is used for a throttle? |
Butterfly valve |
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Waste water analysis and sampling techniques are published in? |
CFR 40 title 136 |
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Best gauge to measure low flow? |
V notch weir |
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Computer security that would help prevent terrorist threats? |
Firewall |
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What should a wastewater treatment plant manager know or do pertaining to public complaints? |
Know the rules and regulations pertaining to his plant |
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What is an advantage of using mechanical seals instead of packing? |
You don't have to replace mechanical seals as often as packing |
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Given the following data concerning the condition of a pump control panel what is the most likely problem? Main power to panel normal Pump main power is on Pump local power switch in hand Motor not running Motor power indicator light off |
Motor burned out |
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Sodium thiosulfate preservative is added to fecal Coliform bottles when? |
Before sterilization |
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356 extremely hazardous substances listed by EPA at or above it threshold planning quantity must notify the SERC and LEPC within how many days? |
60 days |
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The following device is used to measure low flow of wastewater |
V notch weir |
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A gravimetric belt feeder maintains a constant chemical ____________ on a revolving belt. |
Weight |
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The main petroleum refinery waste compounds the can be treated by the activated sludge process A- ammonia B- phenols C- sulfide D- all the above |
D- all the above |
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Office plates require little if any preventive maintenance but occasionally ___________ of the hydraulic sensing lines is a good practice. |
Flushing |
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Flows are measured with Venturi meters by sending the _________ between the water pressure before the restriction in the office and the pressure within the restriction. |
Pressure |
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Closing a motor control circuit supplies ______ to the motor. |
Amps |
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In the COD test what chemical is used for halides? |
Potassium dichromate |
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Dailey flows from a municipality tends to? |
Stay close to the same flow |
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What is a duplicate sample? |
Two samples taken at the same time from one location |
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What is a replicate analysis? |
Two or more analyses for the same constituent in an extract of a single sample |
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An employee has in the past had good attendance record and work performance. But now for the last couple of weeks he has reported late to work several times and neglected several of his duties. You should now do what? |
Talk to the employee about it |
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Under SARA regulations how many pounds of chlorine can you have onsite with out having to report it? |
100 pounds |
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The secondary treatment regulations say how much BOD and TSS % is to be removed? |
85% in 30 day average |
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The lowest detectable level of chlorine residual using DPD method is? |
.01 |
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If the wastewater underwent partial nitrification, chlorine demand would most likely? |
Increase dramatically |
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Everyday from 5-7 pm you notice a slug load of water passing through the treatment system. To what could you attribute this slug to. |
Industry |
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In a confined space entry, what is the air monitor important? |
To check oxygen deficiency, explosive 10% LEL, toxic concentrations |
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After a rainstorm you have a hydrologic slug, to what do you attribute this to? |
Infiltration |
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An operator ask you a question that you don't know the answer to, what should you do? |
Tell him you don't know but you will find the answer for him |
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At the startup of a DAF unit, why would you start and run the unit a while before introducing wastewater? |
To energize the water with air |
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To decrease your sludge blanket on a DAF unit what should you do? |
Increase the speed of the scrapers |
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What is the best method of chlorine determination to be used on a wastewater that is colored and residual of .1 ppm or below? |
Amperometric titration |
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If your grit chamber is to small what is the effect on the system? |
Excess amounts of inorganics |
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What would the results from a settleability test be used for? |
Determine WAS rate |
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An operator needs to put a flow meter on a lift station from an area that is primarily industrial park. What kind of flow meter would be best for this application? |
Magnetic |
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In the start up of a recently rebuilt centrifugal pump you notice the amperage draw is too high, what is the probable cause for this? |
Packing is to tight on shaft |
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What is the definition of suction head? |
The distance from the water to the centerline of the impeller |
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In the maintenance check of your rotary lobe blower system you notice it's overheating and the pop off valve is open. What is the probable cause for this? |
The diffusers are clogged |
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In your primary sludge tank, your flight collector system is broken, what effect will this have on your treatment system? |
MLSS increase |
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What should the oxygen levels be before entering a confined space? |
19.5%-21.5% |
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When you get a sample for fecal Coliform, what should you do? |
Carefully fill the container to within 1 inch of the top |
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If a district or municipality has a high bond rating, what does this mean? |
You will get a high return on the money |
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What preservative is used for q ammonia sample in addition to 4°c? |
H2SO4 to a pH of <2 |
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If a needle is jumping around o. The DO meter what does this indicate? |
Membrane is bad |
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Why should you check ground water levels before pumping a clarifier for service? |
So the tank doesn't float |
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If the cent rate looks dirty what should you do? |
Decrease flow |
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At what temperature is conductivity reported? |
25°c |
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If you have a DO of 6.5 mg/l it is. |
Saturated |
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What pH do you adjust your sample to before ammonia distillation? |
9.5 |
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What is the better disinfectant? A- hypochlorite acid B- monochloramines C- di chloramines |
A - hypochlorite acid |
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Which statement best describes the safety concerns for carbon dioxide? |
It is heavier than air and will cause an oxygen deficient atmosphere by displacing oxygen |
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Which of the following chemicals is explosive, corrosive and causes death? A - methane B- hydrogen sulfide C- ferric chloride |
B - hydrogen sulfide |
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What forms of nitrogen does the TKN test identify? |
Organic and ammonia |
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When using a SCBA what position does the bypass valve stay in? |
Closed |
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When repackaged f a gate valve, to minimize leaking open it.... |
1/2 turn open |
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What can be done to minimize water hammer? |
Install an air bleed valve |
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In your sludge pumping program, the sludge blanket is rising and the % solids is 9% when you start pumping and 6% when you stop. What should you do to correct this problem? |
Decrease the pumping rate |
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When using an SCBA you can interchange parts from different manufacturers when? |
Always |
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What if the following can be collected as a composite sample? A- pH B- oil and grease C- TSS |
C- tss |
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At the lowest fees setting on you chlorinate you still have too much residual. What can you do to still use the same equipment? |
Change to a smaller rota meter device |
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What does conductivity give an indication of? |
Trace metals |
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What test is used to measure the strength of waste water? |
BOD |
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Methane and what other gas is found in an anaerobic digester? |
Carbon dioxide |
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How long do you keep sludge records? |
5 years |
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If you have a leak in the chlorine tank where do you place the leak? |
At the top |
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Most DO meters are what kind? |
Membrane |
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Winkler titration is for? |
Dissolved Oxygen |
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Given the following data what is the most likely cause of the activated sludge diffused aeration system problem
Blower air rate output high Organic load normal Hydronic load normal Borderline dissolve oxygen Low turbulence throughout aeration tank |
Aeration system pipe leaking |
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Comparison of industry flow and flow of municipality/wastewater treatment plant? |
Industry wastewater vary widely in composition, strength, flow and volume as compared to municipality wastewater treatment |
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If you hire a contractor to work on your chlorine system, OSHA requires you to do what? |
Inform them of any hazzards |
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Chemical releases should be reported because of what provision? |
SARA III |
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Successful communication requires mutual... |
Understanding |
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For utility records and/or rate analysis purposes, customers with changing patterns of wastewater are... |
Municipal |
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Which of the following meters has no moving parts? A- rotometer B- Venturi C- proportional D- propellor |
B- venturi |
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Which pump impeller is the most energy efficient? |
Closed impeller |
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You can calculate flow rate in a completely filled pipe if you measure flow velocity or ______. |
Internal pressure |
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In order to discharge treated wastewater to a receiving water in the U.S. The operator of the facility must obtain a permit every _____ years. |
5 |
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You are working in a room using an aerosol can, what is the minimal I alarum protection? |
Protective mask |
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What material would most likely be found in the waste from a tanning industry? |
Organic material |
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BOD:nitrogen:phosphorous Ratio is... |
100:5:1 |
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The presence of amoebas in a mixed liquor sample indicates that the sludge is probably.... |
Young |
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The presence of Rotifera in a mixed liquor sample indicates that the sludge is probably.... |
Old |
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What type of laboratory analysis is usually reported monthly as a geometric mean? |
Fecal coliform |
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A chemical solution where the normality is established is known as a __________ solution. |
Stock |
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What is the major safety hazard with polyelectrolytes? |
Slipping |
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What is a major safety hazard with ferric chloride? |
Corrosive |
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Which gases can you be exposed to in a treatment plant? |
Chlorine, methane and hydrogen sulfide |
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When using a SCBA you have to be: |
Trained in use |
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What is the best chemical to use to adjust pH in an anaerobic digester? |
Lime |
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In the VSS test what is the temperature? |
550°c +/- 50° |
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When chlorine is applied to wastewater the residual is composed mostly of.... |
Hypochlorite ions |
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If the centrate from a solid bowl centrifuge is foamy white, what should you do? |
Decrease polymer |
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When you chlorinate your return sludge to control filamentous bacteria with chlorine or peroxide, these chemicals are... |
Oxidizers |
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Ferric chloride is... |
Corrosive |
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Ferric chloride is... |
Corrosive |
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What is the result of discharging a water with a high BOD loading to a stream? |
Oxygen depletion in the stream |
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When you mix acid in water what do you do? |
Mix acid into water |
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What do you wear when making a confined space entry? |
Safety harness and hard hat |
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What do you wear when making a confined space entry? |
Safety harness and hard hat |
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In BOD why do you add chemicals to the dilution water? |
To adjust pH and provide nutrients to organisms |
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The bacteria that is the true filamentous stalked gram positive is... |
Nocardia |
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In the examination of MLSS you notice the flagellates more dominate, the respiration rate decreased dramatically and over all treatment declining, what is the probable cause for this? |
Toxic slug load from industry |
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How long is the NPDES permit good for? |
5 years |
|
How long is the NPDES permit good for? |
5 years |
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How long before the NPDES permit expires should you start the renewal process? |
You have to file 180 days before expiration |
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How long is the NPDES permit good for? |
5 years |
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How long before the NPDES permit expires should you start the renewal process? |
You have to file 180 days before expiration |
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If you have a dairy discharging in your waste steam what effect can this have on the plant? |
Increase BOD loading |
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Why would you put alum into a secondary clarifier? |
Flock and remove phosphorus |
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What is vulnerability assessment? |
The process of identifying, quantifying and prioritizing vulnerabilities in the system |
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At what pH is hydrogen sulfide most corrosive? |
Less than 5 pH |
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How is current measured? |
Amps |
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What tool is used to measure air and gas? |
CO2 meter |
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What tool is used to measure air and gas? |
CO2 meter |
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What is an Orpheus plate? |
A device used for measuring flow rate by reducing pressure or restricting flow |
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What tool is used to measure air and gas? |
CO2 meter |
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What is an Orpheus plate? |
A device used for measuring flow rate by reducing pressure or restricting flow |
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What is static head? |
Internal pressure of a fluid due to the pressure exerted on its container
Calculate pressure from hieght |
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What should be done first when a problem developed in a mechanically cleaned screen? |
Lock out tag out |
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What are the problems that can develop from using a lime slurry? |
Buildup inside pumps and pipes |
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How can you tell if a new pump is delivering design flows and pressures? |
Measure flows and pressures and compare with manufacturers pump curve |
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Which of the following can most affect the pH of an anaerobic digester? |
Temperature |
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Which of the following can most affect the pH of an anaerobic digester? |
Temperature |
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The ph of a well operated anaerobic digester should be about? |
6.9
6.8-7.2 |
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Which of the following can most affect the pH of an anaerobic digester? |
Temperature |
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The ph of a well operated anaerobic digester should be about? |
6.9
6.8-7.2 |
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How is the amount of oxygen transferred per aerator horsepower affected by water temp in the aeration tank? |
Oxygen transfer rate increases as temp increases |
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A gravimetric belt feeder uses what to measure? |
Weight |
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What is the best backflow prevention? |
Air gap |
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What preservative do you use to preserve a nitrogen sample? |
Sulfuric acid - H2SO4 |
|
What is a duplicate sample? |
Two samples taken at the same time from one location |
|
You are running a BOD, on the first day the sample starts nitrification because: |
Bacteria population is high |
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You are running a BOD, on the first day the sample starts nitrification because: |
Bacteria population is high |
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Wastewater flow with large objects, the pump should have a: |
Closed impellar |
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What do you do to adjust a sample before ammonia distillation? |
Raise the pH |
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What does population equivalent mean? |
A means of expressing the strength of organic material in wastewater |
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When purchased materials are received by the utility they should be. |
Counted and checked against the purchase order |
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When purchased materials are received by the utility they should be. |
Counted and checked against the purchase order |
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Uniformly coefficient refers to: |
Measure of the uniformity of filter media |
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Alum is used to remove... |
Phosphorus |
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pH on odor control should be at? |
9.5 |
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Holding time for nitrogen? |
28 days for TKN and 48 hrs for nitrite |
|
Holding time for nitrogen? |
28 days for TKN and 48 hrs for nitrite |
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What type of materials should be avoided in piping for ferric chloride? |
Metals |
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What method is best used to determine DO |
Winkler titration |
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What method is best used to determine DO |
Winkler titration |
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Federally approved methods for wastewater analysis are listed in ... |
40 CFR 136 |
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What method is best used to determine DO |
Winkler titration |
|
Federally approved methods for wastewater analysis are listed in ... |
40 CFR 136 |
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As the temp increases the oxygen transfer rate ? |
Increases |
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What gas is most commonly found on the startup off a digester that also drops the pH. |
Carbon dioxide |
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Nestlerization is used for what? |
Ammonia test |
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For security reasons SCADA should not be connected to what? |
Internet |
|
Precision is the measure of consent ration, concentration is normalized by using? |
Coefficient/ standard accuracy |
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Precision is the measure of consent ration, concentration is normalized by using? |
Coefficient/ standard accuracy |
|
Air gas flow meter |
Orfice |
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Precision is the measure of consent ration, concentration is normalized by using? |
Coefficient/ standard accuracy |
|
Air gas flow meter |
Orfice |
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Advantage of using ferrous over alum |
Broader pH range |
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Which of the following is the most significant problem in using the activated sludge process to treat seasonal cannery waste? |
Nutrient imbalance |
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Which of the following is the most significant problem in using the activated sludge process to treat seasonal cannery waste? |
Nutrient imbalance |
|
pH for an anaerobic sludge digester? |
6.8-7.4 |
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Which of the following is the most significant problem in using the activated sludge process to treat seasonal cannery waste? |
Nutrient imbalance |
|
pH for an anaerobic sludge digester? |
6.8-7.4 |
|
Amperometric titration is often used when measuring? |
Residual chlorine |
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Type of pump used to decrease the overall specific weight of a confined column of a gas-water mixture? |
Air lift |
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If the discharge head drops on a pump what will happen to the pump? |
Lower discharge flow |
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If the discharge head drops on a pump what will happen to the pump? |
Lower discharge flow |
|
The beveled edge of a weir is located? |
Top face of the weir |
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If the discharge head drops on a pump what will happen to the pump? |
Lower discharge flow |
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The beveled edge of a weir is located? |
Top face of the weir |
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What two gases are most promo are at the startup of a digester? |
Carbon and nitrogen |
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If the discharge head drops on a pump what will happen to the pump? |
Lower discharge flow |
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The beveled edge of a weir is located? |
Top face of the weir |
|
What two gases are most promo are at the startup of a digester? |
Carbon and nitrogen |
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What does it mean if a fitting is 210 lbs? |
Pressure |
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For every _____ c the temp changes biological activity will change |
10° |
|
MHF interior column cooling temp raises why? |
Sludge feed dropped |
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Capacitance level indicator daily maintenance? |
Clean connectors |
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Which of the following is the most likely cause of fluctuating discharge output in a progressive cavity pump? |
Leak in suction pipe |
|
How does UV control disinfection |
Sterilizing the micro organisms so they can not reproduce |
|
What is a maintenance procedure for UV |
Check and clean Quartz sleeves |
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Two pumps of the same capacity operate together with a single main in a typical pump station the discharge will be? |
The same as one pump |
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What type of bottle is used for COD samples? |
Glass |
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Which of the following microscope optical systems should be used when testing for filamentous organisms? |
Phase contrast |
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Theoretically 1mg/l of sulfur dioxide will react instantaneously to neutralize how many mg/l of chlorine in the final effluent? |
1 mg/l |
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A recently rebuilt centrifugal pump has just been returned to service and is now drawing more amps. What is the most likely problem? |
Leaky suction line |
|
The pH of an aeration tank influential is 7.4. The effluent from the aeration tank has a pH of 6.5. The MCRT is 14.5 days. The most likely cause for this is? |
Insufficient alkalinity to support nitrification process |
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The pH of an aeration tank influential is 7.4. The effluent from the aeration tank has a pH of 6.5. The MCRT is 14.5 days. The most likely cause for this is? |
Insufficient alkalinity to support nitrification process |
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Assuming the operator makes no adjustments in the aeration return or waste rate, the addition of high strength anaerobic digester supernatant to the head of the aeration tank will? |
Decrease the DO concentration in the tank |
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A plant has a flow of 1.5 MGD that contains an industrial waste. The influential has 600 mg/l BOD. Assuming .17 pounds of BOD per capita per day, what is the population equivalent of this waste? |
44153 |
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A 20000 gallon tank is full of a liquid with a specific gravity of 1.35. What is the weight of the contents of the tank? |
225,180 pounds |
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In conducting an oxygen uptake test the feed sample consist of: |
Return activated sludge |
|
In conducting an oxygen uptake test the feed sample consist of: |
Return activated sludge |
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A pump has a capacity of 7000 gal/min and lifts the flow 22 feet total head. If the pump efficiency is 85% what the motor is required. |
50 hp |
|
A treatment plant is producing 3750lbs/day of 5% total solids sludge. The positive displacement pump operates at 2.5 gal/stroke and 40 strokes/min. How long will it take for the sludge to be pumped? |
30 minutes |
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A treatment plant is producing 3750lbs/day of 5% total solids sludge. The positive displacement pump operates at 2.5 gal/stroke and 40 strokes/min. How long will it take for the sludge to be pumped? |
30 minutes |
|
Blower engines must be started in an unload mode because.. |
Venting to the atmosphere reduces back pressure and allows the engine to be brought to operating speed under no load conditions. |
|
An operator wasted 13500 gallons of activated sludge to maintain the desired MCRT. The waste activated sludge meter was observed to rise 2 feet in 5 minutes and 30 seconds. What was the rate (GPM) of the flow into the wet well. |
524 GPM |