WASTE WATER TREATMENT 6C EXAM
PREP QUESTIONS AND ANSWERS 2026
VERIFIED.
What is used for Phosphorus Testing? - ANS Stannous Chloride
When sludge is incinerated what is the reduction in volume? - ANS 80%-90%
Four 8" pipes carry the same volume as? - ANS One 16" pipe
In backwashing of a mixed media filter, there is a bed expansion of how much? - ANS 10%
when water temperature increases the settling rate in a clarifier does what? - ANS Decreases
Before being used, a tertiary filter should be what? - ANS Backwashed
Coliform bacteria is More or Less resistant to chlorination than pathological bacteria? -
ANS More
What are always required for installing couplings? - ANS Precision Assembling Device
@2026/2027 ALLRIGHTS RESERVED.
, When an Air Flotation Unit is turned off, drain valves should be opened when? - ANS Only if it
will be off for a long time
Industrial Discharge for pre-treatment must meet specifications within? - ANS 3 Years
Phenolic wastes are treated with what? - ANS Chlorine
A centrifugal pump is running hot, a decrease in flow through the pump will do what? -
ANS Lower the Temperature
How often should air masks be inspected? - ANS Every 6 Months
What is the order from top to bottom for filtered materials? - ANS Coal, Sand, Garnet (CGS)
Microbial Growth rate does what? - ANS Increase rapidly in a short period, then decreases as
sludge age increases
Wire to Water Efficiency includes which measurements? - ANS Motor + Pump efficiency
If a trickling filter is restarted when the temp is under 55 Degrees, how long will it take to reach
full level of treatment? - ANS 4 - 9 Weeks
How do you start up an anaerobic digester? - ANS Half way with seed sludge, then add raw
sludge slowly
@2026/2027 ALLRIGHTS RESERVED.
PREP QUESTIONS AND ANSWERS 2026
VERIFIED.
What is used for Phosphorus Testing? - ANS Stannous Chloride
When sludge is incinerated what is the reduction in volume? - ANS 80%-90%
Four 8" pipes carry the same volume as? - ANS One 16" pipe
In backwashing of a mixed media filter, there is a bed expansion of how much? - ANS 10%
when water temperature increases the settling rate in a clarifier does what? - ANS Decreases
Before being used, a tertiary filter should be what? - ANS Backwashed
Coliform bacteria is More or Less resistant to chlorination than pathological bacteria? -
ANS More
What are always required for installing couplings? - ANS Precision Assembling Device
@2026/2027 ALLRIGHTS RESERVED.
, When an Air Flotation Unit is turned off, drain valves should be opened when? - ANS Only if it
will be off for a long time
Industrial Discharge for pre-treatment must meet specifications within? - ANS 3 Years
Phenolic wastes are treated with what? - ANS Chlorine
A centrifugal pump is running hot, a decrease in flow through the pump will do what? -
ANS Lower the Temperature
How often should air masks be inspected? - ANS Every 6 Months
What is the order from top to bottom for filtered materials? - ANS Coal, Sand, Garnet (CGS)
Microbial Growth rate does what? - ANS Increase rapidly in a short period, then decreases as
sludge age increases
Wire to Water Efficiency includes which measurements? - ANS Motor + Pump efficiency
If a trickling filter is restarted when the temp is under 55 Degrees, how long will it take to reach
full level of treatment? - ANS 4 - 9 Weeks
How do you start up an anaerobic digester? - ANS Half way with seed sludge, then add raw
sludge slowly
@2026/2027 ALLRIGHTS RESERVED.