WASTE WATER GRADE 1 EXAM LATEST WITH
ACTUAL QUESTIONS AND CORRECT VERIFIED
ANSWERS ALREADY GRADED A+ 100%
GUARANTEED PASS!
domestic wastewater - (answers)Comes from schools, homes, hospitals, businesses, light
industrial facilities.
population equivalents - (answers)100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
industrial wastewater - (answers)Comes from industries. Compatible wastes can be processed by
the plant. Incompatible wastes are toxic to the plant.
sanitary wastewater - (answers)The combined domestic and industrial waste waters from
community.
storm water - (answers)Water that runs off roads, parking lots, and other impervious surfaces
during rain and snow storms
sanitary sewers - (answers)Convey domestic and industrial waste waters, typically from where
they are generated to the plant.
storm sewers - (answers)Convey storm water, typically from storm drains directly to a point of
discharge (stream, river, ocean).
combined sewers - (answers)Convey sanitary waste water combined with storm water.
Reasons to collect samples - (answers)federal and state regulatory compliance, process control,
trouble shooting, special studies including future designs.
, grab sample - (answers)One time sample. Chlorine residual, coliform tests, settable solids,
dissolved oxygen, pH, grease and oil, sulfide tests.
Time based composite sample - (answers)Fixed volume of sample is collected after passage of a
set amount of time over a certain time period.
Flow based composite sample - (answers)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.
diurnal flow - (answers)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.
BOD - (answers)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.
COD - (answers)This test involves the chemical oxidation of all organics in a sample. Measure
of organic strength of waste water, COD is always greater than BOD, In raw municipal sewage
COD is typically 2 to 4 times greater than BOD, takes 2 hrs to run COD compared to 5 days for
BOD therefore more appropriate for process control.
pH - (answers)The log of the reciprocal of the the hydrogen ion concentration. PH 6 is 10 times
the hydrogen ion concentration of 7. 5 is 100 times the conc of ph 7.
Total solids - (answers)TSS + TDS
ACTUAL QUESTIONS AND CORRECT VERIFIED
ANSWERS ALREADY GRADED A+ 100%
GUARANTEED PASS!
domestic wastewater - (answers)Comes from schools, homes, hospitals, businesses, light
industrial facilities.
population equivalents - (answers)100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
industrial wastewater - (answers)Comes from industries. Compatible wastes can be processed by
the plant. Incompatible wastes are toxic to the plant.
sanitary wastewater - (answers)The combined domestic and industrial waste waters from
community.
storm water - (answers)Water that runs off roads, parking lots, and other impervious surfaces
during rain and snow storms
sanitary sewers - (answers)Convey domestic and industrial waste waters, typically from where
they are generated to the plant.
storm sewers - (answers)Convey storm water, typically from storm drains directly to a point of
discharge (stream, river, ocean).
combined sewers - (answers)Convey sanitary waste water combined with storm water.
Reasons to collect samples - (answers)federal and state regulatory compliance, process control,
trouble shooting, special studies including future designs.
, grab sample - (answers)One time sample. Chlorine residual, coliform tests, settable solids,
dissolved oxygen, pH, grease and oil, sulfide tests.
Time based composite sample - (answers)Fixed volume of sample is collected after passage of a
set amount of time over a certain time period.
Flow based composite sample - (answers)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.
diurnal flow - (answers)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.
BOD - (answers)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.
COD - (answers)This test involves the chemical oxidation of all organics in a sample. Measure
of organic strength of waste water, COD is always greater than BOD, In raw municipal sewage
COD is typically 2 to 4 times greater than BOD, takes 2 hrs to run COD compared to 5 days for
BOD therefore more appropriate for process control.
pH - (answers)The log of the reciprocal of the the hydrogen ion concentration. PH 6 is 10 times
the hydrogen ion concentration of 7. 5 is 100 times the conc of ph 7.
Total solids - (answers)TSS + TDS
