MultipleChoicePractice-3 Flashcards
Hyancinth cultures are associated with
a. Ponds
b. Trickling filter plants
c. Primary treatment
d. Activated sludge
e. RBC
A. Ponds
Facultative ponds are
a. Aerobic on the top and anaerobic on the bottom
b. Anaerobic on the top and aerobic on the bottom
c. Anaerobic through out
d. Aerobic through out
e. For primary treatment
A. Aerobic on the top and anaerobic on the bottom
Ammonia-nitrogen in the effluent of treatment plants may cause
a. Ammonia toxicity to fish in receiving waters
b. Increased dissolved oxygen depletion in receiving waters
c. Potential health hazards to a newborn infant
d. All are correct
e. Increased MPN
E. All are correct
A COD Test advantage over the BOD test is the
a. Test required little operator time to do
b. Test requires little Operator time to do
c. COD test has no advantage over the BOD test
d. Oxygen demand is not caused by biological organisms
e. Results are available sooner
E. Results are available sooner
In the F/M ratio, the F is
a. Inorganic and organic matter
b. Organic matter only
c. Determined from anaerobic data
d. All are correct
e. Determined from the MLVSS
B. Organic matter only
The main workers in the activated sludge process are
a. Viruses
b. Bacteria
c. Protozoa
d. Rotifers
e. Ciliate
B. Bacteria
(C)(T)
a. Stands for concentration and time
b. Is the value used for disinfection process control
c. All though weighed equally, good operators know T is more important than C
d. All are correct
e. An indicator of the inactivation of microorganisms
D. All are correct
Expressions for pond loading include?
a. Person per acre
b. Detention time
c. Gallons of BOD per day, per acre
d. PPD/ft
e. GPD/ft
A. Persons per acre
Before the breakpoint is reached
a. Chlorine will react with reducing agents
b. Chlorine addition will always produce an increase in chlorine concentration
c. Chlorine will not react with ammonia
d. Chlorine has no disinfection properties
e. All are correct
A. Chlorine will react with reducing agents
Nitrobacter and nitrosomonas bacteria are
a. Responsible for nitrification
b. Responsible for de-nitrification
c. Quick growing bacteria
d. Not effected by temperature
e. Not effected by pH
A. Responsible for nitrification
How often should the DO in wastewater pond be checked?
a. Daily
b. Monthly
c. Once an hour
d. The DO does not need to be checked in a wastewater pond
e. When the boss is around
A. Daily
Sodium nitrate can be used to
a. Provide oxygen for facultative organisms
b. Provide a source for disinfection
c. Caused coagulation
d. Sweeten a sour anaerobic digester
e. Disinfect sludge
A. Provide oxygen for facultative organism
High and low rate digestion refers to
a. The flow rate
b. The time required for treatment
c. The amount of treatment
d. none of the above
e. Growth rate
A. The flow rate
The presence of stalked ciliates in the MLSS normally indicates
a. A MLSS that will not settle well
b. A MLSS that will settle easily
c. The wasting rate needs to be decreased
d. Stalked ciliates are not found in MLSS
e. A long MCRT
B. A MLSS that will settle easily
When starting up an activated sludge basin, white foam indicates
a. A low MLSS concentration
b. A low pH
c. A low F:M ratio
d. A high pH
e. All are correct
A. A low MLSS concentration
