Quality of Sewage Notes | EduRev

Environmental Engineering

Civil Engineering (CE) : Quality of Sewage Notes | EduRev

The document Quality of Sewage Notes | EduRev is a part of the Civil Engineering (CE) Course Environmental Engineering.
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Aerobic Decomposition

  1. Nitrogenous organic matter
    Quality of Sewage Notes | EduRev
    Nitrate
  2. Carbonaceous organic matter
    Quality of Sewage Notes | EduRev
    Carbon dioxide
  3. Sulphurous organic matter
    Quality of Sewage Notes | EduRev
    Sulphate
Nitrogen Cycle under Aerobic Decomposition

Quality of Sewage Notes | EduRev

Anaerobic Decomposition
  1. Nitrogenous organic matter
    Quality of Sewage Notes | EduRev
  2. Carbonaceous organic matter
    Quality of Sewage Notes | EduRev
  3. Sulphurous organic matter
    Quality of Sewage Notes | EduRev
  4. Organic acids
    Quality of Sewage Notes | EduRev

Threshold Odour Number (TON)
Quality of Sewage Notes | EduRev
Vs = The volume of the sewage
VD = The volume of distilled water or odourless water.

Total Solids, Suspended Solids and Settleable Solids
  1. Quality of Sewage Notes | EduRev
    Where,
    S3 = Dissolved solids plus colloidal or filterable solids in mg/lit
    S2 = Non-filterable solids in mg/lit
    S1 = The total amount of solids in mg/lit
    S4 = Volatile suspended solids, in (mg/lit.)
    S5 = Fixed solids
  2. Quality of Sewage Notes | EduRev
    Quality of Sewage Notes | EduRev
    Total Solids
    50% → Dissolved
    25% → Suspended
    25% → Settleable

Chemical Oxygen Demand

  1. Biodegradable + non Biodegradable O.M.
  2. K2Cr2O7 + H2SO4 added and used is measured.

Theoretical Oxygen Demand
Quality of Sewage Notes | EduRev
C6H6 + 7.5O2 → 6O2 + 3H2O
Benzene
C6H12O6 + 6O2 → 6O+ 6H2O
Glucose

Biochemical Oxygen Demand
  1. Quality of Sewage Notes | EduRev
    Where,
    Biochemical oxygen demand in ppm or mg/lit.
    Initial dissolved oxygen in mg/lit.
    Final dissolved oxygen in mg/lit.

  2. Quality of Sewage Notes | EduRev
    Quality of Sewage Notes | EduRev

(i)
Quality of Sewage Notes | EduRev
Where,
k = Rate constant signifying the rate of oxidation of organic matter and it depends upon the nature of organic matter and temperature. Its unit is per day.
Lt = O2 the equivalent of organic matter present after t days.
(ii)  
Quality of Sewage Notes | EduRev
Where,
kD = Deoxygenation constant.
L = Organic matter present at t = 0
(iii)  
Quality of Sewage Notes | EduRev
(iv)  
Quality of Sewage Notes | EduRev
Where,
Yt = The total amount of organic matter oxidized int days i.e. BOD.
(v)
Quality of Sewage Notes | EduRev
(vi)  
Quality of Sewage Notes | EduRev
Where,
Yu = Ultimate B.O.D of  days.
(vii)  
Quality of Sewage Notes | EduRev
Quality of Sewage Notes | EduRev
Quality of Sewage Notes | EduRev

Quality of Sewage Notes | EduRev
(viii) Laboratory Estimations of kD and L values
(Thomas Method)
Quality of Sewage Notes | EduRev
Quality of Sewage Notes | EduRev

Where,
m = Slope of the line
C = Intercept of the line on the y-axis.
Quality of Sewage Notes | EduRev

Relative Stability (s)
Quality of Sewage Notes | EduRev
Where
t20 = time in days at 20oC.
t37 = time in days at 37oC.

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