CA Wastewater Grade 3 sample questions & Answers
Fluffy white foam indicates low aerator T
solids concentration, while leathery
brown foam indicates high solids
concentration.
When an anaerobic digester is F
becoming upset, the first sign will be
increased alkalinity and decreased
volatile acid concentration
Surface aerator oxygen transfer F
efficiency increases as submergence
decreases and the oxygen transfer
efficiency increases
When chlorine is used before F
disinfection for odor control it is not
necessary to satisfy a chlorine demand.
Biological secondary treatment T
processes should remove at least 85%
of the influent BOD
, CA Wastewater Grade 3 sample questions & Answers
Short detention times are normal for F
package plants
An activated sludge plant with an MCRT T
of over 10-days is normally
considered an extended aeration plant.
Wasting of activated sludge on a T
continuos basis is the preferred
method.
SVI is used as an indicator for clarifier T
stability.
The standard BOD test measures the F
amount of dissolved oxygen
consumed by bacteria as they utilize
waste for food during a 8 day period
at 15 degrees Celsius.
When operating an aerobic digester be F
sure to keep the feed sludge
volatile solid concentration high or else
the percent reduction will decrease
, CA Wastewater Grade 3 sample questions & Answers
Any sample can be "fixed" for later F
testing.
The nice thing about anaerobic process F
is the operator can smoke
since no oxygen is present for a fire to
start.
Dissolved oxygen in an aeration tank T
should be at a minimum of 1 ppm
for biological nitrification
Nitrification is the process where by F
ammonia is converted to nitrogen
gas.
In order for nitrification to occur you F
must have an anaerobic process
Chlorine is lighter than air and will F
collect on the ceiling if a leak occurs.
A complete-mix activated sludge basin T
is normally square allowing
complete MLSS mixing.
Fluffy white foam indicates low aerator T
solids concentration, while leathery
brown foam indicates high solids
concentration.
When an anaerobic digester is F
becoming upset, the first sign will be
increased alkalinity and decreased
volatile acid concentration
Surface aerator oxygen transfer F
efficiency increases as submergence
decreases and the oxygen transfer
efficiency increases
When chlorine is used before F
disinfection for odor control it is not
necessary to satisfy a chlorine demand.
Biological secondary treatment T
processes should remove at least 85%
of the influent BOD
, CA Wastewater Grade 3 sample questions & Answers
Short detention times are normal for F
package plants
An activated sludge plant with an MCRT T
of over 10-days is normally
considered an extended aeration plant.
Wasting of activated sludge on a T
continuos basis is the preferred
method.
SVI is used as an indicator for clarifier T
stability.
The standard BOD test measures the F
amount of dissolved oxygen
consumed by bacteria as they utilize
waste for food during a 8 day period
at 15 degrees Celsius.
When operating an aerobic digester be F
sure to keep the feed sludge
volatile solid concentration high or else
the percent reduction will decrease
, CA Wastewater Grade 3 sample questions & Answers
Any sample can be "fixed" for later F
testing.
The nice thing about anaerobic process F
is the operator can smoke
since no oxygen is present for a fire to
start.
Dissolved oxygen in an aeration tank T
should be at a minimum of 1 ppm
for biological nitrification
Nitrification is the process where by F
ammonia is converted to nitrogen
gas.
In order for nitrification to occur you F
must have an anaerobic process
Chlorine is lighter than air and will F
collect on the ceiling if a leak occurs.
A complete-mix activated sludge basin T
is normally square allowing
complete MLSS mixing.
