BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS AND CORRECT ANSWERS

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BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS AND CORRECT ANSWERS

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2025/2026

Institution WASTE WATER CLASS B

Course WASTE WATER CLASS B

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BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS AND CORRECT ANSWERS

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BASIC WASTEWATER OPERATOR
PRACTICE EXAM CLASS 3 QUESTIONS
AND CORRECT ANSWERS

StalkedA2ciliatesA2-A2Ans--
WhatA2isA2theA2predominantA2organismA2inA2aA2healthyA2ActivatedA2SludgeA2TreatmentA2P
lant?

RepresentativeA2andA2Sub-samplesA2timeA2spacedA2overA215A2minutesA2apartA2-A2Ans--
AA2compositeA2sampleA2mustA2be?

300mlA2-A2Ans--WhatA2isA2theA2standardA2volumeA2forA2aA2BODA2sampleA2bottle?

PlugA2valveA2-A2Ans--
IfA2youA2haveA2aA2limeA2slurryA2feedA2line,A2whatA2isA2theA2bestA2valveA2toA2use?

OldA2SludgeA2-A2Ans--
IfA2youA2noticeA2aA2predominanceA2ofA2rotifersA2inA2yourA2activatedA2sludgeA2sampleA2whil
eA2lookingA2atA2itA2underA2aA2microscope,A2whatA2doesA2thisA2indicate?

SettlingA2inA2theA2clarifiersA2-A2Ans--
IfA2yourA2activatedA2sludgeA2plantA2beginsA2toA2nitrify,A2whatA2conditionsA2wouldA2youA2ex
pectA2toA2decrease?

360mg/lA2-A2Ans--CalculateA2theA2BODA2givenA2theA2information:
InitialA2DO:A28.3
FinalA2DO:A25.9
MillilitersA2ofA2sampleA2used:A22

ByA2measuringA2theA2pumpA2outputA2-A2Ans--
HowA2doA2youA2calibrateA2aA2chemicalA2feedA2pump?

H2SO4A2-A2Ans--WhatA2isA2theA2chemicalA2formulaA2forA2sulfuricA2acid?

extendedA2aerationA2-A2Ans--
WhatA2isA2theA2mostA2commonA2typeA2ofA2ActivatedA2SludgeA2packageA2plants?

IncreaseA2wastingA2-A2Ans--
WhatA2isA2theA2mostA2appropriateA2methodA2ofA2reducingA2theA2F:MA2Ratio?

, UnequalA2airA2distributionA2causedA2byA2aA2blownA2diffuserA2-A2Ans--
AnA2operatorA2noticesA2aA2portionA2ofA2theA2aerationA2tankA2withA2largeA2bubblesA2risingA2
up.A2WhatA2isA2theA2mostA2likelyA2problem?

TheA2pressureA2onA2theA2suctionA2sideA2ofA2theA2pumpA2-A2Ans--WhatA2isA2suctionA2lift?

22.5A2mg/lA2-A2Ans--
TheA2primaryA2effluentA2toA2aA2RBCA2systemA2isA2350A2mg/
lA2BOD.A2TheA2primaryA2unitA2removesA283%,A2theA2secondaryA2unitA2removesA250%,A2an
dA2theA2finalA2unitA2removesA225%.A2WhatA2isA2theA2BODA2leavingA2theA2finalA2unitA2ofA2th
eA2RBCA2train?

DecreaseA2theA2lagA2timeA2forA2pumpA2operationA2byA2movingA2theA2floatsA2closerA2togeth
erA2-A2Ans--
TheA2influentA2toA2theA2treatmentA2plantA2isA2septic.A2ItA2isA2determinedA2thatA2itA2isA2comin
gA2fromA2aA2liftA2stationA2upstreamA2fromA2theA2plant.A2WhatA2shouldA2theA2operatorA2do?

ToA2protectA2chemicalsA2thatA2areA2sensitiveA2toA2lightA2-A2Ans--
WhatA2isA2theA2purposeA2ofA2amberA2storageA2bottles?

24A2daysA2-A2Ans--CalculateA2SRT
GIVEN:A2MixedA2liquorA2suspendedA2solidsA2(MLSS)A2=A22400mg/l
AerationA2basinA2volumeA2=A235,000A2gallonsA2=A20.0350A2millionA2gallonsA2(MG)
WasteA2activatedA2sludgeA2(WAS)A2concentrationA2=A23500mg/l
WasteA2activatedA2sludgeA2(WAS)A2flowrateA2=A20.001MGD

HorizontalA2&A2HorizontalA2-A2Ans--HowA2shouldA2aA21-
tonA2chlorineA2cylinderA2beA2moved?

0.68A2-A2Ans--CalculateA2F:MA2ratio
GIVEN:A2InfluentA2BOD5A2=A2290mg/l
InfluentA2FlowA2=A25.0MGD
AerationA2basinA2MLSSA2=A22650A2mg/l
AerationA2basinA2volumeA2=A20.8MG

CloggedA2impellerA2-A2Ans--
WhatA2wouldA2mostA2likelyA2causeA2aA2submersibleA2pumpA2toA2haveA2anA2AMPA2reading
A2thatA2isA2aboveA2theA2optimumA2level?

StatorA2-A2Ans--WhichA2ofA2theA2followingA2areA2non-
movingA2partsA2ofA2aA2runningA2motor?

225A2-A2Ans--CalculateA2SVI
GIVEN:A230A2minuteA2settlingA2testA2=A21800mlA2inA2aA22000mlA2container
MLSS:A24000mg/L

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Uploaded on: February 15, 2026
Number of pages: 10
Written in: 2025/2026
Type: Exam (elaborations)
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