WASTEWATER GRADE 2 STUDY QUESTIONS AND CORRECT ANSWERS

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WASTEWATER GRADE 2 STUDY QUESTIONS AND CORRECT ANSWERS

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2025/2026

Institution WASTE WATER CLASS B

Course WASTE WATER CLASS B

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WASTEWATER GRADE 2 STUDY QUESTIONS AND CORRECT ANSWERS

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WASTEWATER GRADE 2 STUDY
QUESTIONS AND CORRECT ANSWERS

WhatA2isA2theA2methaneA2contentA2inA2aA2properlyA2operatingA2anaerobicA2digester?

a.A230A2toA235%A2byA2volume
b.A21A2toA22%A2byA2volume
c.A265A2toA270%A2byA2volume
d.A215A2toA220A2%A2byA2volumeA2-A2Ans--c

WhatA2willA2theA2additionA2ofA2chlorineA2gasA2doA2toA2theA2pHA2ofA2wastewater?

a.A2ModeratelyA2increaseA2theA2pH
b.A2pHA2willA2notA2beA2affected
c.A2SignificantlyA2increaseA2theA2pH
d.A2DecreaseA2theA2pHA2-A2Ans--d

WhatA2isA2theA2purposeA2ofA2aA2ParshallA2flume?

a.A2MeasureA2turbidity
b.A2MeasureA2flowrate
c.A2MeasureA2settlingA2rate
d.A2MeasureA2solidsA2contentA2-A2Ans--b

WhatA2isA2theA2typicalA2removalA2efficiencyA2ofA2settleableA2solidsA2inA2aA2primaryA2clarifie
r?

a.A295A2toA299%
b.A240A2toA260%
C.A220A2toA250%
d.A210A2toA215%A2-A2Ans--a

WhichA2ofA2theA2followingA2isA2trueA2aboutA2pumpingA2scumA2fromA2aA2primaryA2clarifier?

a.A2PumpingA2scumA2isA2lessA2problematicA2duringA2coldA2weather
b.A2ScumA2rarelyA2leadsA2toA2pluggedA2pipelinesA2dueA2toA2itsA2viscousA2nature
c.A2ScumA2causesA2moreA2pipingA2problemsA2thanA2otherA2substancesA2pumpedA2atA2aA2
wastewaterA2treatmentA2plant.
d.A2ScumA2causesA2theA2leastA2amountA2ofA2pipingA2problemsA2amongA2allA2theA2substan
cesA2pumpedA2atA2aA2wastewaterA2treatmentA2plantA2pumpedA2atA2aA2wastewaterA2treatm
entA2plantA2-A2Ans--c

WhatA2mightA2causeA2thickA2billowsA2ofA2whiteA2sudsyA2foamA2inA2theA2aerationA2tank?

,a.A2MLSSA2isA2tooA2high
b.A2TemperatureA2inA2theA2aerationA2tankA2isA2tooA2low
c.A2OldA2sludge
d.A2MLSSA2isA2tooA2lowA2-A2Ans--d

WhatA2doesA2theA2"M"A2inA2F/MA2ratioA2represent?

a.A2MLSSA2inA2theA2aerationA2tank
b.A2TheA2influentA2BODA2loadingA2rateA2intoA2theA2aerationA2tank
c.A2TheA2mixedA2liquorA2volatileA2suspendedA2solidsA2inA2theA2aerationA2tank
d.A2TheA2massA2ofA2inorganicA2solidsA2inA2theA2aerationA2tankA2-A2Ans--c

InA2general-
A2howA2willA2warmerA2temperatureA2affectA2theA2settlingA2rateA2ofA2solidsA2inA2aA2clarifier?

a.A2DecreaseA2theA2settlingA2rate
b.A2IncreaseA2theA2settlingA2rate
c.A2TemperatureA2willA2notA2affectA2theA2settlingA2rate
d.A2WorsensA2theA2settlingA2rateA2-A2Ans--b

WhatA2couldA2happenA2ifA2theA2digesterA2gasA2isA2mixedA2withA2airA2(85A2TOA295%A2byA2v
olume)?

a.A2CauseA2anA2explosion
b.A2ImproveA2efficiencyA2ofA2digestion
c.A2TheA2bacteriaA2willA2becomeA2aerobicA2andA2increaseA2VSR
d.A2TheA2digesterA2becomesA2saferA2toA2operateA2dueA2toA2lessA2toxicA2gasA2inA2theA2syst
em.A2-A2Ans--a

HowA2willA2algaeA2impactA2theA2chlorineA2demandA2inA2theA2pondA2effluent?

a.A2SlightlyA2decreasesA2chlorineA2demand
b.A2DoesA2notA2affectA2chlorineA2demand
c.A2SignificantlyA2decreasesA2chlorineA2demand
d.A2IncreasesA2chlorineA2demandA2-A2Ans--d

WhichA2ofA2theA2followingA2isA2trueA2aboutA2aA2positiveA2displacementA2pump?

a.A2ItA2isA2aA2typeA2ofA2centrifugalA2pump
b.A2SuctionA2valveA2shouldA2beA2closedA2whenA2theA2pumpA2isA2started
c.A2ItA2mustA2neverA2beA2startedA2withA2theA2dischargeA2valveA2closed
d.A2AddsA2headA2toA2liquidA2usingA2severalA2impellersA2-A2Ans--c

WhatA2isA2trueA2aboutA2theA2F/MA2ratio?

a.A2MLVSSA2dataA2isA2notA2requiredA2toA2determineA2theA2F/MA2ratio

,b.A2VolumeA2ofA2theA2secondaryA2clarifierA2isA2notA2neededA2toA2determineA2theA2F/
MA2ratio
c.A2TheA2amountA2ofA2CODA2orA2BODA2enteringA2theA2aerationA2tankA2doesA2notA2haveA2t
oA2beA2knownA2toA2calculateA2theA2F/MA2ratio
d.A2TheA2amountA2ofA2organismsA2inA2theA2aerationA2tankA2isA2notA2neededA2toA2calculateA
2theA2FA2/MA2ratioA2-A2Ans--b

WhichA2ofA2theA2followingA2isA2oneA2ofA2theA2basicA2rulesA2ofA2laboratoryA2work?

a.A2DoA2notA2leaveA2keysA2inA2equipmentA2orA2vehiclesA2atA2anyA2time
b.A2PatrolA2theA2facilitiesA2frequentlyA2andA2lookA2forA2suspiciousA2activityA2orA2behavior
c.A2NeverA2pipetA2hazardousA2materialA2withA2yourA2mouthA2evenA2ifA2theA2piA2petA2hasA2b
eenA2sterilized
d.A2LockA2outA2andA2tagA2outA2relevantA2mechanicalA2andA2electricalA2equipmentA2beforeA
2startingA2anyA2maintenanceA2activityA2-A2Ans--c

WhatA2isA2theA2recirculationA2ratioA2forA2aA2tricklingA2filter?

a.A2Qr/Q
b.A2Q/Qr
c.A2Q/A2Qr+Q
d.A2Qr+Q/QA2-A2Ans--a

WhichA2ofA2theA2followingA2isA2trueA2aboutA2CODA2andA2BOD?

a.A2TheyA2areA2directA2measurementsA2ofA2theA2organicA2contentA2inA2theA2influent
b.A2TheyA2measureA2theA2inorganicA2contentA2ofA2theA2influent
c.A2TheyA2representA2theA2amountA2ofA2filamentousA2bacteriaA2inA2theA2influent
d.A2TheyA2areA2indirectA2measurementsA2ofA2theA2organicA2contentA2inA2theA2influentA2-
A2Ans--d

WhatA2isA2theA2purposeA2ofA2theA2gritA2channel?

a.A2RemoveA2dissolvedA2andA2non-settleableA2organics
b.A2RemoveA2heavyA2inorganicA2wastes.
c.A2ToA2allowA2activatedA2sludgeA2toA2settle
d.A2RemoveA2substancesA2thatA2floatA2andA2readilyA2settleA2fromA2theA2wastewaterA2asA2p
artA2ofA2primaryA2treatment.A2-A2Ans--b

WhichA2ofA2theA2followingA2isA2trueA2aboutA2theA2extendedA2aerationA2process?

a.A2BugsA2getA2moreA2food
b.A2WastingA2isA2notA2necessaryA2
c.A2ItA2doesA2notA2produceA2asA2muchA2wasteA2sludgeA2asA2otherA2processes.A2
d.A2ItA2isA2veryA2differentA2fromA2theA2conventionalA2activatedA2sludgeA2processA2-A2Ans--c

, WhatA2isA2theA2correctA2formulaA2forA2solidsA2inA2rawA2wastewater?

a.A2Non-volatileA2solidsA2+A2SuspendedA2solidsA2=A2TotalA2solidsA2inA2theA2influent
b.A2DissolvedA2solidsA2+A2SettleableA2solidsA2=A2TotalA2suspendedA2solids
c.A2ColloidsA2+A2dissolvedA2solidsA2=A2totalA2suspendedA2solidsA2
d.A2Non-settleableA2solidsA2+A2SettleableA2solidsA2=A2TotalA2suspendedA2solids.A2-A2Ans--
d

WhatA2isA2"freeboard"A2inA2aA2wasteA2stabilizationA2pond?

a.A2OperationalA2depthA2ofA2theA2pond
b.A2WoodenA2inletA2andA2outletA2structures
c.A2WoodenA2bafflesA2
d.A2VerticalA2distanceA2fromA2normalA2waterA2surfaceA2toA2theA2topA2ofA2theA2levee.A2-
A2Ans--d

WhatA2isA2oneA2ofA2theA2requirementsA2forA2aA2BODA2test?

a.A2TheA2BODA2bottleA2shouldA2beA2completelyA2filledA2toA2theA2top.
b.A2TheA2BODA2bottlesA2mustA2beA2100-mLA2inA2size
c.A2SampleA2bottlesA2shouldA2beA2incubatedA2atA230A2degreesA2CelsiusA2
d.A2StoppersA2shouldA2notA2beA2installedA2onA2theA2bottlesA2toA2ensureA2properA2airA2flowA
2toA2theA2samplesA2-A2Ans--a

WhatA2shouldA2beA2scheduledA2everyA23A2monthsA2forA2aA2flamerA2arresterA2inA2anA2anaer
obicA2digester?

a.A2Replacement
b.A2Maintenance
c.A2FlowA2test
d.A2TemperatureA2testA2-A2Ans--b

WhatA2isA2commonA2practiceA2inA2anA2activatedA2sludgeA2process?

a.A2WasteA2allA2activatedA2sludge
b.A2SludgeA2ageA2ofA214A2daysA2forA2conventionalA2system
c.A2RecirculateA2activatedA2sludge
d.A2limitingA2DOA2toA2increaseA2microorganismA2populationA2-A2Ans--c

PriorA2toA2enteringA2aA2permit-requiredA2confinedA2spaceA2whatA2shouldA2youA2verify?

a.A2AA2standbyA2personA2shouldA2beA2atA2theA2entranceA2toA2theA2confinedA2space.A2AnA2a
dditionalA2personA2isA2notA2required
b.A2AA2standbyA2personA2shouldA2beA2withinA230A2feetA2ofA2theA2confinedA2space.
c.A2AA2standbyA2personA2shouldA2beA2withinA250A2feetA2ofA2theA2confinedA2space.

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