Sludge Disposal Effluent Discharge Standard

# 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

100x = P1 + P1x   100 y = P2 + P2y

x[100 - p1]= P1
y[100 - p2]= p2
and

Dilution and dispersion: Cs = Sweage concentration

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

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

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
time

Streeter-Phelps equation:

Integration factor

Separating variables and integrate

At t = 0, D = D0

Critical time: the time at which critical deficit.

At critical time

Putting tvalue we get

Where

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## Civil Engineering SSC JE (Technical)

2 videos|122 docs|50 tests

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