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Wastewater Grade 1 Exam Treatment Updated 20-24/2025

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Wastewater Grade 1 Exam Treatment Updated 20-24/2025 Wastewater Grade 1 Exam Treatment Updated 20-24/2025 Wastewater Grade 1 Exam Treatment Updated 20-24/2025 Wastewater Grade 1 Exam Treatment Updated 20-24/2025 Wastewater Grade 1 Exam Treatment Updated 20-24/2025

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Wastewater Grade 1 Exam Treatment
ll ll ll ll




ll
Updated 20-24/2025
ll ll ll


ll

domestic llwastewater ll- llCORRECT llANSWER-Comes llfrom llschools, llhomes,
llhospitals, ll
ll
businesses, lllight llindustrial

llfacilities.
ll

population llequivalents ll- llCORRECT llANSWER-100 lllbs llwastewater llper llday, ll.2
lllbs ll
ll
TSS/day, ll.17

llBOD/day
ll

industrial llwastewater ll- llCORRECT llANSWER-Comes llfrom llindustries.
llCompatible ll


wastes llcan llbe llprocessed llby llthe llplant. llIncompatible llwastes llare lltoxic llto llthe
llplant.
ll

sanitary llwastewater ll- llCORRECT llANSWER-The llcombined lldomestic lland
llindustrial ll
ll
waste llwaters llfrom

llcommunity.
ll

storm llwater ll- llCORRECT llANSWER-Water llthat llruns lloff llroads, llparking lllots, lland
llother ll
ll
impervious llsurfaces llduring llrain lland llsnow
llstorms
ll

sanitary llsewers ll- llCORRECT llANSWER-Convey lldomestic lland llindustrial llwaste
llwaters, ll
ll
typically llfrom llwhere llthey llare llgenerated llto llthe
llplant.
ll

storm llsewers ll- llCORRECT llANSWER-Convey llstorm llwater, lltypically llfrom llstorm
lldrains ll
ll
directly llto lla llpoint llof lldischarge ll(stream, llriver,
llocean).
ll

combined llsewers ll- llCORRECT llANSWER-Convey llsanitary llwaste llwater llcombined
llwith ll
ll
storm
llwater.
ll

, ll
Reasons llto llcollect llsamples ll- llCORRECT llANSWER-federal lland llstate
llregulatory

compliance, llprocess llcontrol, lltrouble llshooting, llspecial llstudies llincluding llfuture
lldesigns.
ll

grab llsample ll- llCORRECT llANSWER-One lltime llsample. llChlorine llresidual, llcoliform
lltests, ll
ll
settable llsolids, lldissolved lloxygen, llpH, llgrease lland lloil, llsulfide
lltests.
ll

Time llbased llcomposite llsample ll- llCORRECT llANSWER-Fixed llvolume llof llsample
llis ll
ll
collected llafter llpassage llof lla llset llamount llof lltime llover lla llcertain lltime
llperiod.
ll

Flow llbased llcomposite llsample ll- llCORRECT llANSWER-Fixed llvolume llof llsample llis
llcollected llafter lla llprescribed llamount llof llflow llhas llpassed llthrough llthe llsampling llpoint,

llor lla llvolume llof llsample llproportional llto llthe llflow llis llcollected llafter llpassage llof lla

llprescribed llamount llof lltime llover lla llcertain lltime llperiod. llThis llsample llcan llalso llbe

llcalled lla llflow llproportional llcomposite llsample. ll

diurnal llflow ll- llCORRECT llANSWER-Low llat llnight llbetween ll2 lland ll5 llam, llsteady llsteep
llincrease llin llflow llstarting llafter ll5 llam, llreaching llfirst llpeak llin llthe lllate llmorning llor llearly

llafternoon, llslight lldecrease llthrough llthe llafternoon, llsecond llpeak llbetween ll6 lland ll9

llpm, lland lla lltapering lloff llof llto llthe lllow llflows llof ll2 llam. ll
ll

BOD ll- llCORRECT llANSWER-Depletion llof lldissovled lloxygen llin lla llsample llover ll5 lldays
llat ll20c llis llmeasured. llDirect llmeasure llof llthe llamount llof lldissolved lloxygen llconsumed

llby llaerobic llbacteria llover llfive lldays, llindirect llmeasure llof llthe llorganic llstrength llof

llwaste llwater, llused llto llasses llthe llperformance llof llWTP lland llthe llunit lloperations lland

llunit llprocesses llused llin llWTP. ll
ll

COD ll- llCORRECT llANSWER-This lltest llinvolves llthe llchemical lloxidation llof llall llorganics
llin lla llsample. llMeasure llof llorganic llstrength llof llwaste llwater, llCOD llis llalways llgreater

llthan llBOD, llIn llraw llmunicipal llsewage llCOD llis lltypically ll2 llto ll4 lltimes llgreater llthan

llBOD, lltakes ll2 llhrs llto llrun llCOD llcompared llto ll5 lldays llfor llBOD lltherefore llmore

llappropriate llfor llprocess llcontrol. ll
ll

pH ll- llCORRECT llANSWER-The lllog llof llthe llreciprocal llof llthe llthe llhydrogen llion
llconcentration. llPH ll6 llis ll10 lltimes llthe llhydrogen llion llconcentration llof ll7. ll5 llis ll100 lltimes

llthe llconc llof llph ll7. ll
ll

Total llsolids ll- llCORRECT llANSWER-TSS ll+ llTDS ll
ll

Settleable llsolids ll- llCORRECT llANSWER-All llsettleable llsolids llare llTSS llbut llnot llall
llTSS ll
ll
are
llsettleable.
ll

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