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Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

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Chapter 6

 SLUDGE DISPOSAL, EFFLUENT DISCHARGE STANDARD

 Sludge and its moisture content: The moisture content of sludge is defined as volume of water present in sludge to the volume of sludge.
Actually instead of volume we should use mass but the density of sludge is approximately 1gm/cc so we used volume.
Let volume of solids is 1. Initially moisture content is  p1 % and it reduced to p2 . Let volume of water at initial stage is x and it reduced to y

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
100x = P1 + P1x   100 y = P2 + P2y
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
x[100 - p1]= P1
y[100 - p2]= p2
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE) and  Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Dilution and dispersion: Cs = Sweage concentration

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

CR = River concentration
QS = Sewage discharge
QR = river discharge
C = Combined concentration

 Zones of pollution in a river stream :
1. Zone od degradation
2. Zone of active decomposition
3. Zone of recovery
4. Zone of clear water

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Oxygen deficit: The oxygen deficit 'D' at any time in a polluted river stream is te difference between the actual DO content of water at that time and saturation DO content at the water temperature.
Oxygen deficit D = Saturation DO - Actual DO

 DO Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
                                                 time

Streeter-Phelps equation:

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Integration factor
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE) 

Separating variables and integrate

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

At t = 0, D = D0
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE) 

Critical time: the time at which critical deficit.

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

At critical time

 Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Putting tvalue we get
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Where
Sludge Disposal Effluent Discharge Standard - Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

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