Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
75 Cards in this Set
- Front
- Back
|
What does D.O. stand for? |
Dissolved Oxygen |
|
|
What is MLSS? |
Mixed Liquor Suspended Solids |
|
|
Self Scouring Velocity should be ( ) Fps? |
2 |
|
|
Define Accuracy |
How closely an instrument measures the true value of a process variable. |
|
|
What would cause pneumonic gauges to behave erratically? |
Oil or water in the air supply. |
|
|
If ponds discharge only twice a year, when would they discharge? |
When flows are high in recieving waters, and when it's a non recreational season. |
|
|
Which digestion process provides a greater volatile solds reduction compared to anaerobic digestion? |
Aerobic |
|
|
What causes algae growth in recieving waters to get out of hand? |
Nitrogen and phosphorus. |
|
|
What is a type of aeration method in ponds? |
Floating aerators. |
|
|
What is added to sludge before it gets to the belt press, to aid in dewatering? |
Polymer or polyelectrolytes. |
|
|
What process is best for handling shock loads? |
Step-feed. |
|
|
What sewage has the highest ammonia nitrogen levels? |
Stale raw sewage. |
|
|
A ( ) amount of foam is normal in aeration basins? |
Modest |
|
|
In this process, flow should be where flow is turbulent, and no short circuiting exists. It usually happens just prior to discharge into receiving waters. |
Dechlorination. |
|
|
Olfactometer or an odor panel is used to measure? |
Odors. |
|
|
What is prepared on site due to it's unstable? |
Ozone. |
|
|
What is determined by the velocity of water in the chamber? |
Grit chamber buildup. |
|
|
The stages of SBR's (Sequential Batch Reactors) are? |
Fill, react (aeration), settle, decant, and idle. |
|
|
Used to prevent fires and explosions in digesters. |
Flame arrestor. |
|
|
What are some causes of a loss of vacuum? |
Filter media misaligned, tear in filter media, trough empty, vacuum pumps inoperative. |
|
|
When dewatered sludge is incinerated it is reduced in weight by ( )%? |
90 |
|
|
How can you make a drier cake on a belt filter press? |
Increase belt tension (using rollers) or decrease belt speed. |
|
|
These are components of a (? ) incinerator. Rabble teeth, center shaft, flap gate, blue flame (which means adequate excess air.) It also has 3 zones, top (drying), burning (middle), cooling (bottom. ) |
Hearth |
|
|
What percentage does methane need to be, to be used as fuel? |
62% |
|
|
Large floc develops when? |
Rapid mix is too slow. |
|
|
Improper chemical dosage or rapid mix too fast causes? |
Too small of floc. |
|
|
What can be added to increase pH in primary clarifier? |
Lime or caustic soda. |
|
|
The ratio for C:N:P for activated sludge is? |
100:5:1. |
|
|
Define absorption. |
The soaking of one substance into the body of another. |
|
|
Define adsorption. |
The gathering of gas, liquid, or dissolved substances on the surface of another material. |
|
|
This bacteria has a circle of short hair like protrusions on their front end. |
Rotifer |
|
|
This sludge can usually be concentrated to the highest degree? |
Fresh primary sludge |
|
|
BOD reduction from primary clarifier is an average of? |
35% Range (20%-50%) |
|
|
Clouds of billowing sludge, rising to the top of the secondary clarifier. Caused by too many filamentous organisms, or low pH, or low D.O., or low nutrients, or low sludge age. |
Bulking |
|
|
Caused by a blockage in the suction side of the pump or too high flow rate through the pump. It's the formation and collapse of gas bubbles on the impeller blade. |
Cavitation |
|
|
Too many weeds in an oxidation pond can cause? |
Flow and odor problems. |
|
|
Electric probe level indicators need to be? |
Cleaned periodically. |
|
|
To decrease the MLSS and MCRT in an activated sludge plant... |
Decrease the RAS and increase the WAS. |
|
|
Gaurds are required on? |
Moving parts. |
|
|
Too many amoeba in mixed liquor indicate that the mixed liquor is? |
Too young (new plant.) Or plant is operating at high F:M ratio. |
|
|
If you have excessive growth of filamientous organisms (thiothrix) it usually means? |
Oxygen is too low in aeration basin. Check Oxygen levels in all levels. |
|
|
What type of pond is aerobic on top, and anaerobic on bottom? |
Faculative pond. (Faculative bugs can live under both conditions.) |
|
|
( ? ) Should be metered so adequate treatment can be provided and so that ( ? ) can be monitored? |
(Flow) (I&I) |
|
|
Preaeration helps remove? |
Oil and grease. |
|
|
How do you slow down a trickling filter? |
Open reverse orifices. |
|
|
Sloughing occurs when? |
A layer of organisms get too thick and fall off of the media. It then gets collected in the secondary treatment, and removed as sludge. |
|
|
Bacteria samples require a ( ? ) sample. BOD usually requires a ( ? ) sample. |
(Grab) (Composite) |
|
|
What protects the bulbs in UV systems? |
Quartz sleeve |
|
|
How does UV kill, or inactivate bugs? |
It damages their genetic material. |
|
|
When testing chlorine or sulfur dioxide with ammonia vapors, what does a white cloud indicate? |
That there's a leak. |
|
|
Typhoid, cholera, giardia, dysentery, E. Coli, hepatitis, polio, cryptosporidium, and salmonella are? |
Water born diseases |
|
|
Calcium hypochlorite or HTH is a form of? |
Chlorine |
|
|
This liquid is chocolate brown in color and has a musty odor. |
Mixed Liquor |
|
|
( ? ) between a motor and a pump will cause vibration, even when the pump is first turned on. |
Misalignment |
|
|
What is the best lab test for sludge in aerobic digesters? |
Respiration rate test. |
|
|
A sharp drop in Oxygen uptake load ration usually means? |
Toxicity has entered your system. |
|
|
If you receive a large amount of an unknown chemical being dumped into the collection system, the first thing you should do is? |
Grab a sample of the incoming raw sewage. |
|
|
What may happen if a shock load of toxic material enters your anaerobic digester and upsets the pH level? |
Methane gas production may slowly decrease. |
|
|
The inside of an oxidation pond levee should be sloped ( ? ) |
2:1 |
|
|
The depth of an oxidation pond should be ( ? ) to avoid weed growth. |
3 feet |
|
|
If filtration time on plate and frame filters is too short to fill plate cavities, water will be ( ? ) when the plates are disengaged. |
Discharged |
|
|
You have how many minutes to grab a sample once DEQ shows up? |
30 minutes |
|
|
New NPDES permits must be reapplied for ( ? ) days before expiration? |
180 days or 6 months. This also applies for a new facility. |
|
|
What is sludge age? |
The amount of time the sludge, or bugs, are in the treatment process. Also known as MCRT (Mean Cell Residence Time) |
|
|
What is SVI? |
Sludge Volume Index, measures how well the activated sludge settles in the clarifier. |
|
|
One horse power equates to? |
0.746 kilowatts |
|
|
Any bypass, overflow, etc. Must be reported within? |
24 hours orally and 5 days written. |
|
|
Safest sludge for fertilizer is? |
Heat dried sludge. |
|
|
Renew LPDES permits every ( ? ) years. |
Five |
|
|
A float will travel ( ? ) faster than the average speed of the water in a channel. |
10-15% |
|
|
( ? ) indicates how thick a liquid is. 20 weight oil is thinner than 50 weight oil. The hotter the liquid, the thinner it gets. |
Viscosity |
|
|
Vertical steel shafts on sludge rakes in gravity thickeners used for stirring the sludge. |
Pickets |
|
|
To control filamientous organisms in activated sludge, add ( ? ) to RAS. Also, don't let Oxygen levels get too low in aeration basins. |
Chlorine |
|
|
( ? ) should be at least 2 times it's initial concentration before leaving the gravity thickener. |
Primary sludge |
|
|
What's the purpose of baffles in a clarifier? |
To slow flow down and promote settling, also to prevent short circuiting. |
