Wastewater Grade 1 Exam (Newest
2025/2026 Update) Real Exam
Questions and Answers | Certified
Solutions | 100 % Correct.
Quiz_________________?
domestic wastewater -
Answer☑
Comes from schools, homes, hospitals, businesses, light industrial facilities.
Quiz_________________?
population equivalents -
Answer☑
100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
Quiz_________________?
industrial wastewater -
Answer☑
Comes from industries. Compatible wastes can be processed by the plant. Incompatible wastes are toxic
to the plant.
Quiz_________________?
sanitary wastewater -
Answer☑
The combined domestic and industrial waste waters from community.
, Quiz_________________?
storm water -
Answer☑
Water that runs off roads, parking lots, and other impervious surfaces during rain and snow storms
Quiz_________________?
sanitary sewers -
Answer☑
Convey domestic and industrial waste waters, typically from where they are generated to the plant.
Quiz_________________?
storm sewers -
Answer☑
Convey storm water, typically from storm drains directly to a point of discharge (stream, river, ocean).
Quiz_________________?
combined sewers -
Answer☑
Convey sanitary waste water combined with storm water.
Quiz_________________?
Reasons to collect samples -
Answer☑
federal and state regulatory compliance, process control, trouble shooting, special studies including
future designs.
Quiz_________________?
grab sample -
Answer☑
, One time sample. Chlorine residual, coliform tests, settable solids, dissolved oxygen, pH, grease and oil,
sulfide tests.
Quiz_________________?
Time based composite sample -
Answer☑
Fixed volume of sample is collected after passage of a set amount of time over a certain time period.
Quiz_________________?
Flow based composite sample -
Answer☑
Fixed volume of sample is collected after a prescribed amount of flow has passed through the sampling
point, or a volume of sample proportional to the flow is collected after passage of a prescribed amount
of time over a certain time period. This sample can also be called a flow proportional composite sample.
Quiz_________________?
diurnal flow -
Answer☑
Low at night between 2 and 5 am, steady steep increase in flow starting after 5 am, reaching first peak in
the late morning or early afternoon, slight decrease through the afternoon, second peak between 6 and
9 pm, and a tapering off of to the low flows of 2 am.
Quiz_________________?
BOD -
Answer☑
Depletion of dissovled oxygen in a sample over 5 days at 20c is measured. Direct measure of the
amount of dissolved oxygen consumed by aerobic bacteria over five days, indirect measure of the
organic strength of waste water, used to asses the performance of WTP and the unit operations and
unit processes used in WTP.
Quiz_________________?
COD -
2025/2026 Update) Real Exam
Questions and Answers | Certified
Solutions | 100 % Correct.
Quiz_________________?
domestic wastewater -
Answer☑
Comes from schools, homes, hospitals, businesses, light industrial facilities.
Quiz_________________?
population equivalents -
Answer☑
100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
Quiz_________________?
industrial wastewater -
Answer☑
Comes from industries. Compatible wastes can be processed by the plant. Incompatible wastes are toxic
to the plant.
Quiz_________________?
sanitary wastewater -
Answer☑
The combined domestic and industrial waste waters from community.
, Quiz_________________?
storm water -
Answer☑
Water that runs off roads, parking lots, and other impervious surfaces during rain and snow storms
Quiz_________________?
sanitary sewers -
Answer☑
Convey domestic and industrial waste waters, typically from where they are generated to the plant.
Quiz_________________?
storm sewers -
Answer☑
Convey storm water, typically from storm drains directly to a point of discharge (stream, river, ocean).
Quiz_________________?
combined sewers -
Answer☑
Convey sanitary waste water combined with storm water.
Quiz_________________?
Reasons to collect samples -
Answer☑
federal and state regulatory compliance, process control, trouble shooting, special studies including
future designs.
Quiz_________________?
grab sample -
Answer☑
, One time sample. Chlorine residual, coliform tests, settable solids, dissolved oxygen, pH, grease and oil,
sulfide tests.
Quiz_________________?
Time based composite sample -
Answer☑
Fixed volume of sample is collected after passage of a set amount of time over a certain time period.
Quiz_________________?
Flow based composite sample -
Answer☑
Fixed volume of sample is collected after a prescribed amount of flow has passed through the sampling
point, or a volume of sample proportional to the flow is collected after passage of a prescribed amount
of time over a certain time period. This sample can also be called a flow proportional composite sample.
Quiz_________________?
diurnal flow -
Answer☑
Low at night between 2 and 5 am, steady steep increase in flow starting after 5 am, reaching first peak in
the late morning or early afternoon, slight decrease through the afternoon, second peak between 6 and
9 pm, and a tapering off of to the low flows of 2 am.
Quiz_________________?
BOD -
Answer☑
Depletion of dissovled oxygen in a sample over 5 days at 20c is measured. Direct measure of the
amount of dissolved oxygen consumed by aerobic bacteria over five days, indirect measure of the
organic strength of waste water, used to asses the performance of WTP and the unit operations and
unit processes used in WTP.
Quiz_________________?
COD -
