GRIT REMOVAL
DISINFECTION
PUMPS
MICROBIOLOGY
SLUDGE DIGESTION
MATH
MIXED BAG
100
Question:
What are heavy inorganic materials found in wastewater that will not break down?
ANSWER:
Grit - Eggshells, Sand, and Gravel
100
QUESTION:
What are Chloramines
ANSWER:
Chlorine combined with ammonia.
100
QUESTION:
What is Cavitation.
ANSWER:
The formation of an air bubble or bubbles inside a pump.
Discussion:
When the bubbles collapse, they can damage the impeller or pump housing.
100
QUESTION:
What is Biochemical Oxygen Demand? (BOD)
ANSWER:
The organic strength of a sample by measuring the amount of oxygen consumed over a given period of time and expressed in mg/L.
100
QUESTION:
What is Denitrification
ANSWER:
Facultative bacteria in the activated sludge process can "breathe" nitrate when oxygen is not available.
100
QUESTION:
What is Sludge Volume Index (SVI)
ANSWER:
The calculation that describes the settleability of activated sludge.
100
QUESTION:
What is Aerobic
ANSWER:
The term that describes an environment where dissolved oxygen is plentiful.
200
Question:
What will happen if the flow to the grit chamber is too low?
Answer:
Too much organic material will be deposited
200
QUESTION:
What is Chlorine Dose
ANSWER:
Is determined by the calculation
DOSE = Demand + Residual
200
QUESTION:
What is Friction Head?
ANSWER:
The resistance caused by a pump pushing water uphill through valve elbows.
Also: The inside roughness of the pipe.
200
Question:
The rate at which organisms use the oxygen in water or wastewater while stabilizing decomposable organic matter under aerobic conditions.
Answer:
What is BOD?
200
Question:
How does an operator control the suspended solids in an activated sludge basin?
Answer:
By wasting and returning activated sludge.
200
QUESTION:
What is Food to Microorganism Ratio
ANSWER:
The amount of organic matter (BOD) available per microorganism in the activated sludge process.
200
QUESTION:
What are Ammonia, Nitrite, and Nitrate
ANSWER:
The three components consisting in TIN (Total Inorganic Nitrogen)
300
QUESTION:
What is VELOCITY?
ANSWER:
The force which keeps things in suspension prior to the grit channel.
300
QUESTION:
What is Chlorine Demand?
ANSWER:
The amount of chlorine used up or consumed by the wastewater.
300
QUESTION:
What is Cavitation
ANSWER:
The term that describes the collapsing of air bubbles inside a pump, which can damage the impeller or pump housing.
300
QUESTION:
What are Heterotrophs?
ANSWER:
Bacteria obtaining their carbon (food) by eating other organisms and organic matter.
300
QUESTION:
What is Denitrification?
ANSWER:
It is the process in which facultative bacteria in the activated sludge process can "breathe" nitrate when oxygen is not available.
300
Velocity ft/sec =
Distance Traveled, ft
________________
Time, sec
300
QUESTION:
What is Publicly Owned Treatment Works
(WW Treatment Plant, Wastewater Treatment Facility)
ANSWER:
POTW
400
QUESTION:
What is Detritus?
ANSWER:
The mixture of grit and large quantities of organic matter.
400
TEAM BONUS!
400
QUESTION:
What is Static Head?
ANSWER:
The amount of force a pump must use due to gravity when pumping uphill.
400
Can Autotrophic bacteria consume BOD?
No.
These Bacteria get their carbon from inorganic sources only.
400
To determine the phosphorus balance in a wastewater treatment plant, from where should samples be collected?
Influent, effluent, and waste-activated sludge
400
QUESTION:
What is the means by which the surface overflow rate for a clarifier is calculated.
ANSWER:
Dividing the total flow entering the clarifier by the surface area.
Expressed as: gpd/sf
400
QUESTION:
Colony Forming Units per 100 milliliters
ANSWER:
CFU/100 mL
500
QUESTION:
What is the velocity needed to accomplish settling of grit in a horizontal grit chamber?
ANSWER:
Less than 1ft/sec. (0.7 is ideal)
500
QUESTION:
What is Chlorine Residual
ANSWER:
The amount of chlorine that can be measured after the demand has been satisfied.
500
QUESTION:
What is Total Dynamic Head
ANSWER:
The total equivalent height that a fluid is to be pumped, taking into account the friction losses in the pipe.
500
QUESTION:
What are Anaerobic Bacteria?
ANSWER:
Bacteria that are poisoned by oxygen. They don't want any dissolved oxygen, nitrate, or sulfate around.
500
QUESTION:
What is Mixed Liquor Suspended Solids (MLSS) or "bugs"
ANSWER:
The term that describes the mixture of bacteria, protozoans, filaments, and other organisms present in the activated sludge basin.
500
Determine the food-to-microorganism ratio (F:M) in the aeration basin of an activated sludge plant.
- Flow In = 5 MGD
- Waste Strength = 250 mg/L Biochemical Oxygen Demand (BOD5)
- Aeration Basin Volume = 335,000 ft3
- Mixed Liquor suspended Solids (MLSS)= 2,950 mg/L
The F:M ratio is the amount of food fed/active biomass.
- Influent feed: 5,000,000-gal x 8.34 lb./gal x 250/106 = 10,425 lb.
- MLSS - 335,000 ft3 x 7.48 gal/ft3 x 8.34 lb./gal x 2,950/106 = 61,650 lb.
- F:M = 10,425/61,650 = 0.169 or 0.17
500
QUESTION:
What are Pathogens
ANSWER:
Bacteria, viruses, and protozoans that can cause illness in humans