wastewater grade 1 exam
Study online at https://quizlet.com/_256mx4
1. domestic wastewater Comes from schools, homes, hospitals, businesses, light industrial facil-
ities.
2. population equivalents 100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
3. industrial wastewater Comes from industries. Compatible wastes can be processed by the
plant. Incompatible wastes are toxic to the plant.
4. sanitary wastewater The combined domestic and industrial waste waters from community.
5. storm water Water that runs off roads, parking lots, and other impervious surfaces
during rain and snow storms
6. sanitary sewers Convey domestic and industrial waste waters, typically from where they
are generated to the plant.
7. storm sewers Convey storm water, typically from storm drains directly to a point of
discharge (stream, river, ocean).
8. combined sewers Convey sanitary waste water combined with storm water.
9. Reasons to collect sam- federal and state regulatory compliance, process control, trouble shoot-
ples ing, special studies including future designs.
10. grab sample One time sample. Chlorine residual, coliform tests, settable solids, dis-
solved oxygen, pH, grease and oil, sulfide tests.
11. Time based composite Fixed volume of sample is collected after passage of a set amount of time
sample over a certain time period.
12. Flow based composite Fixed volume of sample is collected after a prescribed amount of flow has
sample 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
, wastewater grade 1 exam
Study online at https://quizlet.com/_256mx4
a certain time period. This sample can also be called a flow proportional
composite sample.
13. diurnal flow 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.
14. BOD Depletion of dissovled oxygen in a sample over 5 days at 20c is mea-
sured. 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.
15. COD 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.
16. pH 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.
17. Total solids TSS + TDS
18. Settleable solids All settleable solids are TSS but not all TSS are settleable.
19. Hydrogen sulfide h2s Toxic, flammable and explosive, rotten egg odor, dulls sense of smell,
paralyzes ability to breath, corrosive, heavier than air collects in low lying
areas.
20. Methane ch4
Study online at https://quizlet.com/_256mx4
1. domestic wastewater Comes from schools, homes, hospitals, businesses, light industrial facil-
ities.
2. population equivalents 100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day
3. industrial wastewater Comes from industries. Compatible wastes can be processed by the
plant. Incompatible wastes are toxic to the plant.
4. sanitary wastewater The combined domestic and industrial waste waters from community.
5. storm water Water that runs off roads, parking lots, and other impervious surfaces
during rain and snow storms
6. sanitary sewers Convey domestic and industrial waste waters, typically from where they
are generated to the plant.
7. storm sewers Convey storm water, typically from storm drains directly to a point of
discharge (stream, river, ocean).
8. combined sewers Convey sanitary waste water combined with storm water.
9. Reasons to collect sam- federal and state regulatory compliance, process control, trouble shoot-
ples ing, special studies including future designs.
10. grab sample One time sample. Chlorine residual, coliform tests, settable solids, dis-
solved oxygen, pH, grease and oil, sulfide tests.
11. Time based composite Fixed volume of sample is collected after passage of a set amount of time
sample over a certain time period.
12. Flow based composite Fixed volume of sample is collected after a prescribed amount of flow has
sample 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
, wastewater grade 1 exam
Study online at https://quizlet.com/_256mx4
a certain time period. This sample can also be called a flow proportional
composite sample.
13. diurnal flow 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.
14. BOD Depletion of dissovled oxygen in a sample over 5 days at 20c is mea-
sured. 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.
15. COD 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.
16. pH 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.
17. Total solids TSS + TDS
18. Settleable solids All settleable solids are TSS but not all TSS are settleable.
19. Hydrogen sulfide h2s Toxic, flammable and explosive, rotten egg odor, dulls sense of smell,
paralyzes ability to breath, corrosive, heavier than air collects in low lying
areas.
20. Methane ch4
