WASTEWATER TREATMENT
OPERATOR UPDATED ACTUAL EXAM
QUESTIONS CORRECT ANSWERS
⩥ Total Suspended Solids (TSS). Answer: solids that will not pass
through glass filter. .1% of wastewater. 180-300mgl. each person loads
.2 lbs per day.
⩥ math pg 26. Answer:
⩥ Biochemical Oxygen Demand (BOD). Answer: each person adds .17
lb per day. amount of oxygen needed by the bugs. 160-280mgl in
wastewater.
⩥ math pg 28. Answer:
⩥ ammonia as nitrogen. Answer: parameter in wastewater. normal range
kjeldahl 40-50 ppm, organic nitrogen 15-20ppm, ammonia nitrogen 25-
30ppm.
each person adds .02 lbs each day
report only
,⩥ math p29. Answer:
⩥ phosphorus. Answer: rage 5-20mgl total, 1-5 organic,
each person adds .0048 lbs a day
normal treatment removes 1-2 mgl
discharged can cause eutrophication
limits 1mgl average, 2 mgl max
⩥ conservative pollutants. Answer: metals. not altered by
microorganisms
⩥ flow. Answer: report only
100gallons per day per person
⩥ math p32. Answer:
⩥ fecal coliform, e coli. Answer: colony count per 100ml
fecal coliform 200 monthly average, 400 maximum,
e coli 130 monthly average, 240 max
sterile container, grab sample, 6 hr holding time, sodium thiosulphate to
remove cl2
, ⩥ DO. Answer: normal limit 7 mgl
in plant desired 2-4 mgl
must be calibrated
⩥ PH. Answer: measure of hydrogen ions in solution H+,
acidity or alkalinity of solution,
limits usually between 6-9
logrithmic, increase 10x per unit
⩥ CL2. Answer: limit, monthly average .011 mgl, daily max .019 mgl
calibrated daily
⩥ population loading. Answer: BOD .17
TSS .2
phos .0048
influent 100 gallons
⩥ what is the preservative added to samples. Answer: sulfuric acid to PH
less than 2
⩥ what acid used to preserve metal samples. Answer: nitric acid
OPERATOR UPDATED ACTUAL EXAM
QUESTIONS CORRECT ANSWERS
⩥ Total Suspended Solids (TSS). Answer: solids that will not pass
through glass filter. .1% of wastewater. 180-300mgl. each person loads
.2 lbs per day.
⩥ math pg 26. Answer:
⩥ Biochemical Oxygen Demand (BOD). Answer: each person adds .17
lb per day. amount of oxygen needed by the bugs. 160-280mgl in
wastewater.
⩥ math pg 28. Answer:
⩥ ammonia as nitrogen. Answer: parameter in wastewater. normal range
kjeldahl 40-50 ppm, organic nitrogen 15-20ppm, ammonia nitrogen 25-
30ppm.
each person adds .02 lbs each day
report only
,⩥ math p29. Answer:
⩥ phosphorus. Answer: rage 5-20mgl total, 1-5 organic,
each person adds .0048 lbs a day
normal treatment removes 1-2 mgl
discharged can cause eutrophication
limits 1mgl average, 2 mgl max
⩥ conservative pollutants. Answer: metals. not altered by
microorganisms
⩥ flow. Answer: report only
100gallons per day per person
⩥ math p32. Answer:
⩥ fecal coliform, e coli. Answer: colony count per 100ml
fecal coliform 200 monthly average, 400 maximum,
e coli 130 monthly average, 240 max
sterile container, grab sample, 6 hr holding time, sodium thiosulphate to
remove cl2
, ⩥ DO. Answer: normal limit 7 mgl
in plant desired 2-4 mgl
must be calibrated
⩥ PH. Answer: measure of hydrogen ions in solution H+,
acidity or alkalinity of solution,
limits usually between 6-9
logrithmic, increase 10x per unit
⩥ CL2. Answer: limit, monthly average .011 mgl, daily max .019 mgl
calibrated daily
⩥ population loading. Answer: BOD .17
TSS .2
phos .0048
influent 100 gallons
⩥ what is the preservative added to samples. Answer: sulfuric acid to PH
less than 2
⩥ what acid used to preserve metal samples. Answer: nitric acid
