Wastewater grade 1 exam questions and
answers graded A+
domestic wastewater ✔✔Comes from schools, homes, hospitals, businesses, light industrial
facilities.
population equivalents ✔✔100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
industrial wastewater ✔✔Comes from industries. Compatible wastes can be processed by the
plant. Incompatible wastes are toxic to the plant.
sanitary wastewater ✔✔The combined domestic and industrial waste waters from community.
storm water ✔✔Water that runs off roads, parking lots, and other impervious surfaces during
rain and snow storms
sanitary sewers ✔✔Convey domestic and industrial waste waters, typically from where they are
generated to the plant.
, storm sewers ✔✔Convey storm water, typically from storm drains directly to a point of
discharge (stream, river, ocean).
combined sewers ✔✔Convey sanitary waste water combined with storm water.
Reasons to collect samples ✔✔federal and state regulatory compliance, process control, trouble
shooting, special studies including future designs.
grab sample ✔✔One time sample. Chlorine residual, coliform tests, settable solids, dissolved
oxygen, pH, grease and oil, sulfide tests.
Time based composite sample ✔✔Fixed volume of sample is collected after passage of a set
amount of time over a certain time period.
Flow based composite sample ✔✔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.
answers graded A+
domestic wastewater ✔✔Comes from schools, homes, hospitals, businesses, light industrial
facilities.
population equivalents ✔✔100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
industrial wastewater ✔✔Comes from industries. Compatible wastes can be processed by the
plant. Incompatible wastes are toxic to the plant.
sanitary wastewater ✔✔The combined domestic and industrial waste waters from community.
storm water ✔✔Water that runs off roads, parking lots, and other impervious surfaces during
rain and snow storms
sanitary sewers ✔✔Convey domestic and industrial waste waters, typically from where they are
generated to the plant.
, storm sewers ✔✔Convey storm water, typically from storm drains directly to a point of
discharge (stream, river, ocean).
combined sewers ✔✔Convey sanitary waste water combined with storm water.
Reasons to collect samples ✔✔federal and state regulatory compliance, process control, trouble
shooting, special studies including future designs.
grab sample ✔✔One time sample. Chlorine residual, coliform tests, settable solids, dissolved
oxygen, pH, grease and oil, sulfide tests.
Time based composite sample ✔✔Fixed volume of sample is collected after passage of a set
amount of time over a certain time period.
Flow based composite sample ✔✔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.
