CA Wastewater Grade 3 sample
questions
Fluffy white foam indicates low aerator solids concentration, while leathery brown foam indicates high
solids concentration. Ans- T
When an anaerobic digester is becoming upset, the first sign will be increased alkalinity and decreased
volatile acid co...
CA Wastewater Grade 3 sample
questions
Fluffy white foam indicates low aerator solids concentration, while leathery brown foam indicates high
solids concentration. Ans- T
When an anaerobic digester is becoming upset, the first sign will be increased alkalinity and decreased
volatile acid concentration Ans- F
Surface aerator oxygen transfer efficiency increases as submergence decreases and the oxygen transfer
efficiency increases Ans- F
When chlorine is used before disinfection for odor control it is not necessary to satisfy a chlorine
demand. Ans- F
Biological secondary treatment processes should remove at least 85% of the influent BOD Ans- T
Short detention times are normal for package plants Ans- F
An activated sludge plant with an MCRT of over 10-days is normally
considered an extended aeration plant. Ans- T
Wasting of activated sludge on a continuos basis is the preferred
method. Ans- T
SVI is used as an indicator for clarifier stability. Ans- T
The standard BOD test measures the amount of dissolved oxygen
consumed by bacteria as they utilize waste for food during a 8 day period
at 15 degrees Celsius. Ans- F
,When operating an aerobic digester be sure to keep the feed sludge
volatile solid concentration high or else the percent reduction will decrease Ans- F
Any sample can be "fixed" for later testing. Ans- F
The nice thing about anaerobic process is the operator can smoke
since no oxygen is present for a fire to start. Ans- F
Dissolved oxygen in an aeration tank should be at a minimum of 1 ppm
for biological nitrification Ans- T
Nitrification is the process where by ammonia is converted to nitrogen
gas. Ans- F
In order for nitrification to occur you must have an anaerobic process Ans- F
Chlorine is lighter than air and will collect on the ceiling if a leak occurs. Ans- F
A complete-mix activated sludge basin is normally square allowing
complete MLSS mixing. Ans- T
Blanks are used in the BOD test to calculate dilution water DO uptake Ans- T
Flexible piping sometimes called a pigtail should connect a chlorine
container to stationary piping. Ans- T
Carbon dioxide will lower the pH of water. Ans- T
, When chlorine gas combines with moisture in the air it forms
hydrochloric gas. Ans- T
A high hydrogen sulfide gas concentration is required before your
sense of smell will be dulled. Ans- F
Alkalinity is the key control for an activated sludge basin. Ans- F
30 days is normally required for anaerobic digestion Ans- T
The first sign that an anaerobic digester is becoming sick is normally
A. a pH change.
B. a decrease in gas production.
C. a change in the volatile acid/alkalinity relationship.
D. an increase in the amount of hydrogen sulfide gas.
E. a temperature change. Ans- C
In order for a pond to be functioning correctly________ must be taking
place.
A. photosynthesis
B. rapid temperature changes
C. rapid pH changes
D. rapid DO changes
E. alkalinity changes Ans- A
Potential problems of ammonia in wastewater.
A. ammonia toxicity to fish.
B. DO depletion in the receiving waters.
C. Increase algae growth.
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