wst 091 math sludge age hydraulic loading

8/7/2019 WST 091 Math Sludge Age Hydraulic Loading

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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

wst 091 math sludge age hydraulic loading

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