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WST 091Introduction to
Wastewater Operations ISludge Age
Math Section
Spring 2011
Week 8
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Detention TimeDT = Ave Volume / Ave Flow
Flowin
Flow outVolume
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Sludge AgeSludge Age = Ave Solids/ Ave Solids Flow
Flowin
Flow outSolids
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Solids and
Solids FlowSludge Age = Ave Solids/ Ave Solids Flow
Solids
SolidsFlowin
Solids Flow out
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Sludge Age UnitsSludge Age, Days =
Ave Solids, lbs/ Ave Solids Flow, lbs/Day
Solids, lbsSolids Flow out
SolidsFlowin
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Concentration Conversion to
Solids and Solids FlowSolids are floating in Water
Solids Flow outSolids, lbs
SolidsFlowin
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8.34 Concentration
Conversion Formula
* 8.34 =
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Solids, lbs =Conc., mg/L * Volume, MG * 8.34, lbs/gal
Solids Flow, lbs/day =Conc., mg/L * Flow, MGD * 8.34, lbs/gal
8.34 Concentration
Conversion Formula
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Sludge Age
Sludge Age, Days =
Ave Solids in Tank, lbsAve Solids Flow, lbs/Day
= (Conc. Solids in Tank, mg/L)*(Tank Volume, MG)*8.34
(Conc. Solids in Flow, mg/L)*(Flow, MGD)*8.34
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Loading Rate CalculationsHydraulic Loading Rate =
(Flow +Recirc Flow), gpd
Area, sq ft
In Flow
Area
Reci
rculationFlow
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Loading Rate CalculationsSurface Overflow Rate =
Flow, gpdArea, sq ft
Flow
Area
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Loading Rate CalculationsFiltration Rate =
Flow, gpmArea Filter, sq ft
Flow
Area
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Loading Rate CalculationsBackwash Rate =
Flow, gpmArea Filter, sq ft
Flow
Area
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Loading Rate CalculationsUnit Filter Run Volume (UFRV)=
Total Volume, gallonsArea Filter, sq ft
Flow
Volume
Area
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Closing