Calculating the Daily Sludge Production of an Sewer Wastewater Treatment Plant

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Calculating the Daily Sludge Production of an Sewer Wastewater Treatment Plant

Below you can find the typical formulas, coefficients and empirical data used to establish the basic design of a complete mix suspended growth biological sewage wastewater process.

To use this calculator please fill in the input value data of your sewer wastewater and as a result some basic plant design and effluent BOD data will follow out of the calculations. If the normal sewer water characteristics are unknown, please press the "typical data" button for an autofill of the input fields.
More information and theory about the Input Parameters and the Kinetic Coefficients you can find in the Documentation.

Characteristics of Primary Sedimentation Effluent      
wastewater flowrate Q = m3/d
influent soluble substrate concentration (bsCOD) S0 = BOD or bsCOD g/m3
nbVSS concentration in influent X0,i = g/m3 or mg/l
inert inorganics Total Suspended Solids (iTSS) iTSS = g/m3
total MLVSS concentration XT = g/m3 or mg/l
Sedimentation Retention Time (SRT) SRT = d
       
Kinetic Coefficients      
maximum rate of soluble substrate utilization k = g COD/g∙d
biomass yield Y = g VSS/g COD used
endogenous decay coefficient kd = g VSS/g VSS∙d
half-velocity constant Ks = g COD/m3
fraction of biomass that remains as cell debris fd = g VSS/g VSS
       
     
       
The daily sludge production is: PX,T,VSS = kg VSS/d
  PX,T,TSS = kg TSS/
       

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Documentation
These formula will establish the daily sludge production of an sewer wastewater treatment plant:

Where:
Q = influent flowrate [m3/d]
Y = biomass yield [g VSS/g COD used]
S0 = influent soluble substrate concentration (bsCOD) [g bsCOD/m3]
S = effluent soluble substrate concentration (bsCOD) [g bsCOD/m3]
kd = endogenous decay coefficient [g VSS/g VSS∙d]
SRT = Sedimentation Retention Time [d]
fd = fraction of biomass that remains as cell debris [g VSS/g VSS]
Xo,i = nbVSS concentration in influent [g nbVSS/m3]
VSS0 = influent Volatile Suspended Solids [g VSS/m3] or [mg/l]
TSS0 = influent Total Suspended Solids [g TSS/m3] or [mg/l]

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!!! Lenntech BV cannot be held responsible for errors in the calculation, 
the program itself or the explanation. For question or remarks please contact us.

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