# Disposal of Sewage Effluent Notes | Study Environmental Engineering - Civil Engineering (CE)

## Civil Engineering (CE): Disposal of Sewage Effluent Notes | Study Environmental Engineering - Civil Engineering (CE)

The document Disposal of Sewage Effluent Notes | Study Environmental Engineering - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Environmental Engineering.
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)

Introduction

Standards of Dilution for Discharge of Wastewaters into Rivers

• Standards of Dilution based on Royal Commission Report
• BIS Standards for Discharge of Sewage and Industrial Effluents in Surface Water Sources and Pub
• General standards for Discharge of Environment Pollutants from effluents into Surface Water Sources, Public Sewers, and Marine Coasts Under Environment (Protection) Rules, 1986

Dilution and Dispersion

Where,
Cs = The concentration of sewage in mg/lit.
Qs = A flow rate of sewage in m3/sec or lit/sec.
CR = The concentration of the river in mg/lit.
QR = Flow rate (discharge in m3/sec or lit/sec.
Cmix = The concentration of the mixture.

Zone of Pollution in River Stream

Saturation D.O at 20oC → 9.2 mg/lit.
Saturation D.O at 30oC → 7.6 mg/lit.
Saturation D.O at 0oC → 14.6 mg/lit.

ab = cd

Where,
TOD = Theoretical oxygen demand
BOD = Biological oxygen demand
COD = Chemical oxygen demand
(BOD)u = Ultimate BOD (Yu)

Stretcher-Phelps Equation

Where,
Dt = D.O deficit in mg/lit after t days.
L = Ultimate first stage BOD of the mix at a point of waste discharge in mg/lit.
Do = Initial oxygen deficit of the mix at the mixing point in mg/lit.
kR = Reoxygenation constant
kD = Deoxygenation constant
f = Self-purification constant
tC = Critical time at which minimum dissolved oxygen occurs i.e.

DC = Critical maximum oxygen deficit.

The document Disposal of Sewage Effluent Notes | Study Environmental Engineering - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Environmental Engineering.
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)
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## Environmental Engineering

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